CDNs found by themselves, and servers followed through time

PrivaPub now finds CDNs three ways, best first: the address ranges the
CDNs publish (Cloudflare, Fastly, Amazon CloudFront, Bunny, Gcore,
Imperva), downloaded daily by CdnUpdater and kept in CdnRangeSet; the
CDN's fingerprint in the responses it already gets from a server
(EdgeHintsHandler on the federation client); and the networks that carry
only a CDN. The fixed ASN list is gone; ASNs shared with plain hosting
(AWS, DataPacket) no longer hide a server. A server's Geo records the
CDN, its domain and how it was found, and weekly snapshots now keep the
city and coordinates too.

Servers through time (ServerPlaces): /instances/:host/history lists a
server's weekly snapshots, a CDN-fronted server's geo names the CDN's
domain and where the server was before it (before_cdn), and
/api/privapub/v1/cdns and /cdns/:domain group servers by CDN with week
by week who joined and who left. Owner decisions recorded in ROADMAP.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LsXgEaXee4GCU1hwYgPJXw

.gitea/workflows/deploy.yml

@@ -90,13 +90,16 @@ jobs:
           fi
 
       - name: Verify what is being served
-        env:
-          SMOKE_TOKEN: ${{ secrets.PRIVAPUB_SMOKE_TOKEN }}
         run: |
           served=$(curl -fsS "$PUBLIC_URL/build.json" | python3 -c "import json,sys; print(json.load(sys.stdin).get('commit',''))")
           [ "$served" = "$BUILD_COMMIT" ] || { echo "::error::served build is '$served', expected '$BUILD_COMMIT'"; exit 1; }
           code=$(curl -s -o /dev/null -w '%{http_code}' -H 'Accept: application/activity+json' "$PUBLIC_URL/peasants/privapub")
           [ "$code" = "200" ] || { echo "::error::the instance actor answered $code"; exit 1; }
+          # SecureMode (owner decision 2026-10-04): an unsigned reader gets 401 from a persona, a browser the public page
+          code=$(curl -s -o /dev/null -w '%{http_code}' -H 'Accept: application/activity+json' "$PUBLIC_URL/peasants/thepra")
+          [ "$code" = "401" ] || { echo "::error::an unsigned GET of a persona answered $code, not 401: SecureMode is off"; exit 1; }
+          code=$(curl -s -o /dev/null -w '%{http_code}' -H 'Accept: text/html' "$PUBLIC_URL/peasants/thepra")
+          [ "$code" = "302" ] || { echo "::error::a browser asking for a persona got $code, not a redirect"; exit 1; }
           code=$(curl -s -o /dev/null -w '%{http_code}' "$PUBLIC_URL/.well-known/nodeinfo")
           [ "$code" = "200" ] || { echo "::error::nodeinfo answered $code"; exit 1; }
           code=$(curl -s -o /dev/null -w '%{http_code}' "$PUBLIC_URL/swagger/index.html")
@@ -106,6 +109,39 @@ jobs:
           code=$(curl -s -o /dev/null -w '%{http_code}' -X POST -H 'Content-Type: application/activity+json' \
             --data '{"type":"Follow","actor":"https://example.org/users/x","object":"'"$PUBLIC_URL"'/peasants/privapub"}' "$PUBLIC_URL/human-centipede")
           [ "$code" = "401" ] || { echo "::error::an unsigned inbox POST answered $code"; exit 1; }
-          tools/smoke/mastodon-api.sh "$PUBLIC_URL" "$SMOKE_TOKEN"
+          tools/smoke/mastodon-api.sh "$PUBLIC_URL"
-          [ -n "$SMOKE_TOKEN" ] || echo "::warning::PRIVAPUB_SMOKE_TOKEN is not set, so the signed-in API was not checked"
+          open=$(curl -fsS "$PUBLIC_URL/nodeinfo/2.1" | python3 -c "import json,sys; print(json.load(sys.stdin)['openRegistrations'])")
+          enabled=$(curl -fsS "$PUBLIC_URL/api/v2/instance" | python3 -c "import json,sys; print(json.load(sys.stdin)['registrations']['enabled'])")
+          [ "$open" = "$enabled" ] || { echo "::error::NodeInfo says registrations are $open, the instance API $enabled"; exit 1; }
+          curl -fsS "$PUBLIC_URL/stargazing" | grep -q 'The crawler is <strong>on</strong>' \
+            || { echo "::error::/stargazing does not say the crawler is on"; exit 1; }
           echo "::notice::serving $served"
+
+      # @thepra is the deploy's own persona (owner decision, 2026-10-04): the server's CLI makes or keeps it, undiscoverable,
+      # and gives its root a new password on every deploy, so no secret is stored and nobody has to create anything.
+      - name: Sign in as @thepra and check the signed-in API
+        run: |
+          creds=$(cd "$WEB_ROOT" && ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin smoke thepra | grep -E '^deploy-smoke [^ ]+$' | tail -1)
+          [ -n "$creds" ] || { echo "::error::the smoke persona could not be prepared"; exit 1; }
+          read -r login password <<< "$creds"
+          echo "::add-mask::$password"
+          read -r token cid cs <<< "$(tools/smoke/oauth.sh "$PUBLIC_URL" "$login" "$password" thepra read)"
+          echo "::add-mask::$token"
+          tools/smoke/mastodon-api.sh "$PUBLIC_URL" "$token"
+          discoverable=$(curl -fsS -H "Authorization: Bearer $token" "$PUBLIC_URL/api/v1/accounts/verify_credentials" | python3 -c "import json,sys; print(json.load(sys.stdin).get('discoverable'))")
+          [ "$discoverable" = "False" ] || { echo "::error::@thepra is discoverable"; exit 1; }
+          curl -fsS -o /dev/null -X POST "$PUBLIC_URL/oauth/revoke" --data-urlencode "token=$token" \
+            --data-urlencode "client_id=$cid" --data-urlencode "client_secret=$cs"
+          echo "::notice::signed in as @thepra"
+
+      # The server fetches DB-IP Lite itself (GeoUpdater) about 30 s after it starts and then daily; the deploy only checks.
+      - name: Geolocation databases are current
+        run: |
+          for kind in city asn; do
+            db="/var/lib/privapub/geo/dbip-$kind-lite.mmdb"
+            for i in $(seq 1 60); do [ -s "$db" ] && break; sleep 10; done
+            [ -s "$db" ] || { echo "::error::$db is missing: the server has not fetched DB-IP Lite"; exit 1; }
+            days=$(( ($(date +%s) - $(stat -c %Y "$db")) / 86400 ))
+            [ "$days" -le 40 ] || { echo "::error::$db was installed $days days ago"; exit 1; }
+          done
+          curl -fsS "$PUBLIC_URL/stargazing" | grep -o 'DB-IP Lite [0-9-]*' | head -1 | sed 's/^/::notice::locating with /'

CLAUDE.md

@@ -1,4 +1,4 @@
-# CLAUDE.md
+# CLAUDE.md
 
 Guidance for working in this repository. `docs/ROADMAP.md` holds the owner's decisions and the phased plan to full
 ActivityPub interop; read it before changing anything federation-, privacy- or API-shaped. `docs/INTEROP.md` is the
@@ -29,8 +29,8 @@ Privacy features in the model:
 
 The intended client is the Mastodon client API (Tusky, Elk, Phanpy, Ivory), where each avatar logs in as its own
 account. The private `/clientapi` covers what Mastodon can't express. `thepra/decePubClient`
-(https://decepub.thepra.dev) is the owner's own Pleroma-FE-like PWA. It still shows mock data and is not wired to the
+(https://decepub.thepra.dev) is the owner's own Pleroma-FE-like PWA. It signs in once on `/clientapi` and exchanges that
-server.
+JWT for each persona's Mastodon token (`PersonaExchange`), then uses both APIs.
 
 ## Route names are deliberate
 
@@ -136,18 +136,27 @@ curl-able. Outbound fetches only go to https DNS names resolving to public addre
 `Federation__AllowPrivateNetworks=true`, `Federation__AllowPlainHttp=true` and `Federation__AcceptAnyCertificate=true`,
 which startup refuses in Production.
 
-Promoting an admin on the box (signing up as "admin" grants nothing):
+The admin CLI runs with every service built but nothing started (no Kestrel, no hosted services), so it can run next to
+the live service. Sign-up is closed in production (invitations only), so the first login is made here; promoting is how
+an admin is made (signing up as "admin" grants nothing):
 
 ```bash
-cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin promote <root>
+cd /var/www/privapub.thepra.dev
+echo '<password>' | ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin create-root <login> --admin   # password on stdin
+ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin promote|demote <root>
+ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin smoke <persona>     # the deploy's: prints "deploy-smoke <new password>"
 ```
 
+The deploy runs them as `build-runner`, which owns the published files, reads `appsettings.Production.json` through
+group www-data and reaches the private mongod; `sudo -u www-data` works too.
+
 ## Federation invariants
 
 1. **Every outbound request goes through `IFederationHttp`.** Its handler resolves the name itself and connects only
    to public addresses; redirects are followed by hand (three at most, each re-checked); bodies are capped at 1 MB;
    only JSON media types are read; a refused URL is not asked again for five minutes. Never create another
-   `HttpClient` for federation.
+   `HttpClient` for federation. The only other outbound traffic is SMTP and `GeoUpdater`'s monthly DB-IP Lite download
+   (its own `geo` client, a fixed HTTPS host, size-capped, the file checked before it is swapped in).
 2. **Every fetch is signed by the instance actor** (`privapub`), never by a persona; deliveries are signed by the acting
    avatar or group. Both are draft-cavage rsa-sha256 over `(request-target) host date` (+ `digest` on bodies).
 3. **A remote document is believed only from its own address.** `RemoteActorService.FetchObject` requires the
@@ -173,8 +182,17 @@ cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Produ
    `ContentFormat` says what `Text` holds. Remote names are plain text.
 8. **Circles federate to members only.** A circle is an undiscoverable Group actor that takes follow requests (the owner
    approves); its posts are addressed to the circle and its `/flock`, delivered to members' personal inboxes, never
-   announced, and served only to a signed request from a member or a member's instance actor
+   announced. Each member's copy also names that member in `cc` (`OutboxPublisher.Naming`, owner decision
-   (`SignedFetchAuthorizer`), 404 otherwise. Circles never appear in search, lookups, mentions or profile pages.
+   2026-10-04), because Mastodon and GoToSocial keep a post only when it names one of their accounts; Create, every
+   Update and the Delete all go through `OutboxPublisher.Publish` for that. A reply to a circle post stays in the circle,
+   and a circle post never asks a non-member for a quote. Circles never appear in search, lookups, mentions or profile
+   pages.
+   **A post that is not public is served only to a signed request from someone it was for** (`SignedFetchAuthorizer.MayRead`):
+   a follower or an addressed account for followers-only, an addressed account for a DM, a member for a circle, or the
+   instance actor of a server where one of them lives; 404 to anyone else, 410 to them once it is deleted. A circle
+   refetch names the requesting member, or the members on the requesting server. A DM's `context`
+   (`/peasants/{name}/whispers/{id}`) lists the conversation's posts for its participants. Mastodon deletes its copy
+   when a refetch answers 404, which is why this matters.
    **Communities** are FEP-1b12 groups: `GroupDistributor` announces the whole activity (plus the object for new posts,
    for Mastodon), top-level posts are `Page`s with a `name`, posting follows `Group.PostingPolicy`.
    Located posts (`LocalGeo`) are the only local-only posts.
@@ -183,19 +201,32 @@ cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Produ
 10. **Nothing slow happens inside a request.** Deliveries and inbox processing are `Job`s (`Infrastructure/Jobs`):
     leased, retried on Mastodon's curve, at most two per host, paused per host by `RemoteInstance`. The inbox answers
     202 once it has verified and queued; a handler must be idempotent (unique `ObjectURI`, job `DedupeKey`).
-11. **Every "may anyone see this" goes through `VisibilityPolicy.IsPublic`;** a persona-specific read uses `CanSee`, and
+11. **Every number about posts and users goes through `Domain/Privacy/Counted`** (owner decision 2026-10-04: one
+    answer everywhere): a persona's `statuses_count`, its outbox `totalItems`, NodeInfo `localPosts` and the instance
+    `status_count` all count Mastodon's way (not deleted, not a DM, boosts included, circle and located posts too);
+    users exclude personas of banned or deleted roots; `replies_count` counts only public and unlisted replies; a
+    remote account that deletes itself takes its likes, votes, reactions, boosts and replies out of every count
+    (`GoneActors`). Follower and following counts are public, their members never are (`hide_collections` is always
+    true).
+12. **Every "may anyone see this" goes through `VisibilityPolicy.IsPublic`;** a persona-specific read uses `CanSee`, and
     any other read of stored posts filters by `IsShown`. All three hide deleted posts and the posts of a remote account
     that deleted itself (`Post.AuthorGone`: kept, hidden everywhere, owner decision).
-12. **Remote content is stored only when someone here asked for it:** a persona follows the author, is addressed or
+13. **Remote content is stored only when someone here asked for it:** a persona follows the author, is addressed or
     mentioned, it replies to a local post, or it is addressed to a community the author follows; a public parent is
     fetched as context. Followers-only is detected by the author's stored `followers` URL.
-13. **Home timelines are written, not computed:** every stored or created post goes through `Fanout.Distribute`, and
+14. **Home timelines are written, not computed:** every stored or created post goes through `Fanout.Distribute`, and
     every delete removes its `TimelineEntry` rows. Local deletes are soft (content cleared, 410 Tombstone).
 
 ## Mastodon client API invariants
 
 1. **A token is one persona.** Its subject is the avatar id; the root id lives only in the fifteen-minute `/oauth`
    cookie used while choosing the persona, and never in a token, an authorization or a response.
+   - **The first-party client exchanges the root JWT for one persona's token** (RFC 8693 on `/oauth/token`,
+     `subject_token_type` `urn:ietf:params:oauth:token-type:jwt`, `avatar_id`; `Api/Mastodon/Auth/PersonaExchange.cs`).
+     Only the seeded public application (`ClientApi:FirstPartyClientId`, default `decepub`) holds the grant.
+     `RootJwtSubjectToken` validates the JWT through `RootJwt`, the same rules as JwtBearer (signature, lifetime, ban,
+     deletion, session stamp). The issued token is the same kind as the authorization code flow's, so revocation and
+     `RootSessions` cover it.
 2. `/api/*` authenticates with OpenIddict validation, everything else with the old JWT (`PrivaPub` policy scheme).
    Every `/api` request re-checks that the persona's root is neither banned nor deleted (`MastodonController`).
 3. Read parameters through `Params` (query, form and JSON merged Rails-style), never MVC binding. A value type read
@@ -205,9 +236,12 @@ cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Produ
    error that leaves without a body (a challenge, a 404 from routing, a 429) gets Mastodon's `{"error": ...}` from
    `UseMastodonErrorBodies`. `NeverFiveHundredTests` walks every route with junk ids, anonymously, as a persona and
    with a junk token.
-6. Advertise `4.2.0 (compatible; PrivaPub)` until grouped notifications exist.
+6. Advertise `4.2.0 (compatible; PrivaPub)` until streaming and Web Push exist too; `api_versions.mastodon = 7` stays,
+   because clients show quotes from it, so everything a 4.3+ client calls because of it must answer: grouped
+   notifications (`/api/v2/notifications`, its unread count, groups, accounts and dismiss) and the notification policy.
 7. **What a Mastodon `Status` cannot say goes in `Status.privapub`** (`PrivaPubStatus`): object type, title, excerpt,
-   cover, the author's source, link, video, audio and event details, and up/down votes. Every media URL in it goes
+   cover, the author's source, link, video, audio and event details, a remote post's own place (Pixelfed's `location`,
+   never federated again), and up/down votes. Every media URL in it goes
    through the proxy; only page links (`link.url`, an event's online link) point at the remote site, because following
    one is the reader's choice.
 
@@ -234,6 +268,16 @@ cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Produ
 
 - **No root id in federation output, NodeInfo or logs, no IP next to an identity in logs, and no `ex.Message` to a
   client** ("Something went wrong." instead).
+- **Sign-in and recovery never tell which logins or addresses exist** (owner decision 2026-10-04): every failed sign-in
+  gets "That username and password do not match." after the same hashing (`RootUsersService.Decoy`, a constant-time
+  comparison), and only a correct password learns of a ban. Every recovery request answers the same sentence and
+  queues a `SendRecovery` job, found or not; `RecoveryJob` sends the email and keeps only a SHA-256 of the code, for an
+  hour. A recovered password ends every session of the root (`RootSessions`: a new `SessionStamp`, which every `/clientapi`
+  JWT carries, and OpenIddict revocation for each persona).
+- **Deleting a root deletes everything public it had** (`RootRemoval`, from the admin route or `/clientapi/user/delete`
+  with the password): its sessions end, each persona and each group it owns sends `Delete{Actor}` to followers, members
+  and the accounts it follows, the personas' posts are emptied, and `/peasants/{name}`, its inbox and WebFinger answer
+  410 (`LocalActorService.Gone`) while the names stay reserved. The root keeps only a `deleted-{id}` name.
 - **Never derive a public name from the root username.** Invitation sign-up takes `AvatarUserName` and refuses one
   equal to the login.
 - **One username space:** personas, groups and the instance reserve their name in `ReservedName` (unique index) before
@@ -276,18 +320,32 @@ cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Produ
   revision. Delivery details reach them through `Arrival.Current`, which `InboxProcessor` sets for the handler's
   duration. A fetched record has no signature, key or `@context` of the activity that caused the fetch (its activity
   fields name that trigger), and every record stores its `Extensions` and `ContextNamespaces` for statistics. The raw form lives outside `Post` so timelines never load it. Read through
-  `/api/privapub/v1/statuses/:id/provenance` and `/api/privapub/v1/instances/:host`.
+  `/api/privapub/v1/statuses/:id/provenance` and `/api/privapub/v1/instances/:host` (or `?host[]=`, up to 40; this
+  server answers too).
+- **A server's place leaves only through `PublicGeo.Project`:** the city, coordinates (0.1°) and network it was located
+  to, whatever its size (there is no user threshold), and only the CDN's name for a CDN-fronted one. This server's own
+  place is its host's address located once a day (`SelfLocation`), or `Statistics:Geo:Self` when the owner sets it.
+- **CDNs are found three ways, best first** (`Infrastructure/Geo/CdnCatalog.cs`): the ranges a CDN publishes
+  (`CdnUpdater` downloads them daily into `CdnRangeSet`, keeping the old set when a download or parse fails), the CDN's
+  fingerprint in the responses PrivaPub already gets (`EdgeHintsHandler` on the federation client, memory only), and
+  a network that carries nothing but a CDN. Never list an ASN shared with plain hosting (AWS, Google, Microsoft,
+  DataPacket). A server's `Geo` records the CDN, its domain and how it was found.
+- **Servers through time** (`Domain/Statistics/ServerPlaces.cs`, from the weekly `RemoteInstanceSnapshot`s):
+  `/api/privapub/v1/instances/:host/history`, a CDN-fronted server's `geo.before_cdn`, and the CDNs grouped by their
+  own domain (`/api/privapub/v1/cdns`, `/cdns/:domain` with weekly joined/left).
 - **Remote objects are parsed for every shape in `ObjectShapes`:** `url`/`icon`/`image` as a value, an object or an
   array; Markdown `content`; missing `mediaType`s inferred; thumbnails from any of their five places; and the typed
   `Link`, `Video`, `Audio` and `Event` details. A Mastodon API card is built from those, never by fetching the linked page
   (that fetch is the owner's decision 1, for P6).
-- **An `Update` is an edit only when its `updated` is newer than ours** (`RemoteEdits.IsEdit`; plain and community-wrapped
+- **An `Update` is an edit only when its `updated` is newer than ours**, or for a first edit no older and with the text
+  actually changed, since GoToSocial's whole-second timestamps make a quick edit carry `updated == published` (`RemoteEdits.IsEdit`; plain and community-wrapped
   Updates both go through `RemoteEdits.Apply`, and deletes through `RemoteDeletes.Remove`). Otherwise it refreshes
   the poll, video, audio and event details and nothing else, and leaves no revision: Mastodon and Misskey refresh poll
   counts with bare Updates.
 - **A poll vote is a `Note` with a `name`, an `inReplyTo` that is a poll we hold, and no content.** `CreateHandler`
   hands it to `PollService.Receive` before anything else, so it never becomes a reply. Our votes on other servers' polls
-  go only to the poll's author, without `published` (PieFed counts a vote only then).
+  go only to the poll's author, without `published` (PieFed counts a vote only then). A `closed` in the future is the
+  poll's end, not its closing: Akkoma sends an open poll's end only there (`ObjectShapes`).
 - **Link previews follow owner decision 1** (`Domain/Content/LinkPreviews.cs`): only public posts, queued on arrival with
   0–60 s of jitter, one cached `LinkPreview` per address for the whole server, never fetched when someone reads.
   `LinkPreviews.Wanted` is called where posts are saved (`CreateHandler`, `StoreContext`, `StatusService.Publish`).
@@ -401,14 +459,41 @@ tools/pasture/run.sh down                                            # removes e
     delete is checked as a 404 on `/api/v1/statuses/{id}`.
   - It creates its accounts locked, so the scenario approves alice's request through `/api/v1/follow_requests`, which
     also checks our pending (`requested`) state and the manual Accept.
-  - 37 checks: discovery and follows both ways; posts and CW; a reply and its notification; likes and boosts both
+  - 55 checks: discovery and follows both ways; posts and CW; a reply and its notification; likes and boosts both
     ways; DMs both ways and off public timelines; polls both ways; quote policy; link cards; edits and deletes both
-    ways; unfollow; block and unblock; statistics.
+    ways; communities and circles; locked personas; unfollow; block and unblock; statistics.
+  - It files a circle post as a direct message and shows it only to the accounts it mentions, so like a DM it is
+    checked in the member's `/api/v1/conversations`, never by URI.
 - **Mastodon (4.7.3):** web and sidekiq on the shared Postgres and Redis, `ALLOWED_PRIVATE_ADDRESSES` for the network.
   Its token comes from `rails runner` (no password grant). Without Elasticsearch its status search finds nothing, so
   deliveries are checked through `/api/v1/accounts/:id/statuses` of the sender as Mastodon knows them, or
   `Status.exists?` through `rails runner`. Its actors are numbered (`/ap/users/<id>`), so look URIs up rather than
-  build them. 49 checks; circle posts are an expected failure (see `docs/INTEROP.md`, Mastodon).
+  build them. Circle posts and a followers-only post survive its signed refetch (`ActivityPub::FetchRemoteStatusService`
+  through `rails runner`). Inbound Block is the one expected failure until P7.
+- **Misskey (2026.10.0):** one container on the shared Postgres and Redis. A new Misskey federates with nobody
+  (`federation: none`) until `admin/update-meta` says `all`, which `misskey_up` does. Its API is `POST /api/<endpoint>`
+  with the token as `i` (`mk` in the scenario); `users/relation` answers a list, `users/notes` leaves replies out unless
+  asked, and a user has one reaction per note. Never verify a delivery with `ap/show`: it fetches. 35 checks.
+- **Sharkey (2025.4.7):** `peers/sharkey.sh` is the Misskey peer under another name, image, database, Redis db and
+  home (`/sharkey/.config`); `scenarios/sharkey.sh` runs Misskey's scenario with `MISSKEY_NAME=sharkey`, then follows
+  again (Misskey's ends unfollowed and blocked) and checks edits both ways and the FEP-e232 quote tag. 40 checks.
+- **Akkoma (3.20.1):** no official image, so `images/akkoma` installs the OTP release (pinned by checksum; the "stable"
+  zip moves, and a moved one fails the build) and `akkoma_up` builds it once. Its HTTP clients read the CA bundles
+  shipped in the release (CAStore, certifi), so the entrypoint appends Caddy's CA there. `pleroma_ctl` passes its
+  arguments on unquoted: no value may contain a space. Its Linkify never takes `@user@host.test` for a mention, so the
+  scenario addresses alice with Pleroma's `to[]`; its API never reports a remote blocker as `blocked_by`, so the block is
+  read from its `user_relationships`. 44 checks.
+- **Lemmy (1.0.0-beta.2):** the backend alone on the shared Postgres, its admin made by `setup` in the generated
+  `config.hjson`. It trusts Caddy's CA through `SSL_CERT_FILE` and reaches the network through
+  `DANGER_FEDERATION_ALLOW_LOCAL_IP=1`; 0.19 cannot join (its rustls trusts only its bundled roots). Its API is
+  `/api/v4/<path>` with a bearer token (`lm` in the scenario), and `sort` values are lowercase. It logs no refused
+  activity at `warn` (`LEMMY_LOG` sets `RUST_LOG`); the reason is in the 400's body. It answers our community's echo of
+  its own activity and every bare `Announce{object}` 400 by design, and the echo is still needed (see
+  `docs/INTEROP.md`, Lemmy). A new Lemmy never sends what it queued for a server before its send worker for that
+  server started, so the scenario waits for that worker (`lm_worker`) before its first follow. 20 checks; relayed votes and a moderator's removal are expected failures (P7).
+- **SecureMode:** `PRIVAPUB_ENV="Federation__SecureMode=true" run.sh up …`, as production runs. A check of what an
+  unsigned reader sees uses `unserved` and `gone_unsigned` (`lib/interop.sh`), which expect 401 when SecureMode is on and
+  404 or 410 when it is off.
 - **Crawler:** `PRIVAPUB_ENV="Statistics__Crawler__Enabled=true Statistics__Crawler__Seeds__0=mastodon.test"
   run.sh up mastodon`, then `interop.sh crawler`. `PRIVAPUB_ENV` passes any setting to the PrivaPub container.
 - `run.sh up` replaces every container, Mongo included, so each run starts clean. To keep the data, republish into
@@ -423,10 +508,17 @@ the owner's GoToSocial account.**
   `deploy.yml`: tests, self-contained linux-x64 publish, snapshot and `mongodump` to `/var/backups/privapub.thepra.dev`,
   stop → rsync → start, a `127.0.0.1:6970/build.json` health loop with rollback, then public checks (actor, NodeInfo,
   Swagger 404, inbox junk 400, unsigned 401) and `tools/smoke/mastodon-api.sh` (app registration, client credentials,
-  discovery, instance, public timeline; pass a persona token as a second argument to check the signed-in side).
+  discovery, instance, public timeline). Then it checks that what production should be running is running:
+  - NodeInfo and the instance API agree on registrations (closed, invitations only);
+  - `/stargazing` says the crawler is on;
+  - **@thepra signs in**: `PrivaPub admin smoke thepra` gives the root `deploy-smoke` a new password, `tools/smoke/oauth.sh`
+    runs the real OAuth flow (the pasture's `privapub_token` uses the same script), the signed-in API is checked, the
+    persona must be undiscoverable, and the token is revoked;
+  - the DB-IP Lite databases, which the server fetches itself (`GeoUpdater`), exist and are at most 40 days old.
 - **The box:** Max (`nuvola.xyz`). Unit `privapub` runs as www-data from `/var/www/privapub.thepra.dev` with
   `ASPNETCORE_ENVIRONMENT=Production`.
-- **One-time root setup:** `deploy/max/setup.sh`, run through `../arasaka.software/tools/max/run.sh`.
+- **One-time root setup:** `deploy/max/setup.sh`, run through `../arasaka.software/tools/max/run.sh` (directories, the
+  runner's sudoers line, the units, nginx and the certificate). Nothing that runs later needs it again.
 - **Config:** `appsettings.Production.json` is committed and deployed, **secrets included, by the owner's convention**
   (the same as arasaka.software). A hand edit on the box is lost at the next deploy.
 - **Secrets drift:** `AppConfigurationService` copies `AppConfiguration` into Mongo on first boot and reads the stored

FEDERATION.md

@@ -12,17 +12,29 @@ PrivaPub is an ActivityPub server written in C#. This document follows
 
 ## Tested against
 
-- **GoToSocial 0.22.1, end to end.** It runs in a private network on the workstation (`tools/pasture/`) and is driven
+End to end, in a private network on the workstation (`tools/pasture/`), each peer driven through its own client API
-  through its own client API. Checked both ways:
+and every run starting clean, with signed fetches required (as privapub.thepra.dev runs):
-  - follows, including to a locked account;
+- **GoToSocial 0.22.1**
-  - public posts with a content warning;
+- **Mastodon 4.7.3**
-  - replies with notifications;
+- **Misskey 2026.10**
-  - likes and boosts;
+- **Sharkey 2025.4.7**
-  - direct messages;
+- **Akkoma 3.20.1**
-  - edits and deletes;
+- **Lemmy 1.0.0-beta.2**
-  - unfollow.
+
-- **Mastodon, Misskey, Lemmy and PeerTube, by unit tests only.** The tests feed the parser documents written in each
+Checked both ways, where the peer has the feature:
-  server's shape. No live exchange with any of them has run yet.
+- follows, locked accounts included;
+- every visibility, content warnings, replies and their notifications;
+- likes, boosts and emoji reactions with their undos;
+- direct messages;
+- polls;
+- quotes;
+- images with alt text;
+- edits with history and deletes;
+- communities and circles;
+- blocks and unfollows.
+
+`docs/INTEROP.md` has each peer's evidence and what is still expected to fail. PeerTube, PieFed, Mbin and the others are
+covered by unit tests written in their documents' shape.
 
 ## Supported FEPs
 
@@ -30,11 +42,16 @@ PrivaPub is an ActivityPub server written in C#. This document follows
 - [FEP-f1d5: NodeInfo in Fediverse Software](https://codeberg.org/fediverse/fep/src/branch/main/fep/f1d5/fep-f1d5.md)
 - [FEP-2c59: Discovery of a WebFinger address from an ActivityPub actor](https://codeberg.org/fediverse/fep/src/branch/main/fep/2c59/fep-2c59.md)
 - [FEP-1b12: Group federation](https://codeberg.org/fediverse/fep/src/branch/main/fep/1b12/fep-1b12.md) (communities; see "Groups")
+- [FEP-044f: Consent-respecting quote posts](https://codeberg.org/fediverse/fep/src/branch/main/fep/044f/fep-044f.md)
+  (`QuoteAuthorization` at `/parrot-licences/{id}`; checked with Mastodon both ways)
+- [FEP-9967: Polls](https://codeberg.org/fediverse/fep/src/branch/main/fep/9967/fep-9967.md)
+- [FEP-c0e0: Emoji reactions](https://codeberg.org/fediverse/fep/src/branch/main/fep/c0e0/fep-c0e0.md) (`EmojiReact`, and Misskey's
+  `Like` with content)
+- [FEP-5feb: Search indexing consent](https://codeberg.org/fediverse/fep/src/branch/main/fep/5feb/fep-5feb.md) (`indexable`)
 
-Planned (see `docs/ROADMAP.md`, phases P5 to P8, and the per-platform notes in `docs/INTEROP.md`): FEP-044f (quotes),
+Planned (see `docs/ROADMAP.md`, phases P7 and P8, and the per-platform notes in `docs/INTEROP.md`): FEP-9098 (custom
-FEP-9967 (polls), FEP-c0e0 (emoji reactions), FEP-9098 (custom emoji), FEP-7888 and FEP-f228 (threads), FEP-7628 (Move),
+emoji), FEP-7888 and FEP-f228 (threads), FEP-7628 (Move), FEP-8fcf (followers synchronisation), FEP-8967 (link
-FEP-8fcf (followers synchronisation), FEP-5feb (`indexable`), FEP-8967 (link attachments), FEP-521a and FEP-8b32 (keys
+attachments), FEP-521a and FEP-8b32 (keys and integrity proofs), FEP-ae0c (relays).
-and integrity proofs), FEP-ae0c (relays).
 
 ## Actors
 
@@ -58,7 +75,8 @@ The names are the project's own and are stable; resolve actors through WebFinger
 
 - The key is `{actor}#main-key`, RSA 2048, served as SPKI PEM with `owner` set to the actor.
 - `published` on an actor is a whole day, chosen at random up to two weeks before the account was made, so two
-  personas made on the same day do not share a date. `indexable` is `false`.
+  personas made on the same day do not share a date. `indexable` is `false` unless the persona turns it on, and
+  `discoverable` is `true` unless it turns that off (the deploy's own persona, @thepra, is undiscoverable).
 - The instance actor is `/peasants/privapub` (type `Application`). It signs every fetch PrivaPub makes, so no avatar's key
   is used to read another server's content.
 
@@ -73,8 +91,10 @@ A group is either a **community** or a **circle**.
   top-level post is a `Page` with a `name`. Members are counted at `/flock`; moderators are listed at `/wardens`, which
   the actor's `attributedTo` points to, with `postingRestrictedToMods` as Lemmy expects. A mention of a community posts into it.
 - A **circle** is private. Its actor is not discoverable and every follow is a request. Its posts are addressed to the
-  circle and its members collection, delivered to each member's own inbox and never announced. They are served only
+  circle and its members collection, delivered to each member's own inbox and never announced. Each member's copy also
-  to a signed request from a member, or from the instance actor of a member's server; anyone else gets 404. A
+  names that member in `cc`, so servers that keep only posts naming one of their accounts (Mastodon, GoToSocial) keep
+  it; it names no other member. The posts are served only to a signed request from a member, or from the instance actor
+  of a member's server, and that copy names the member (or the members on that server); anyone else gets 404. A
   Mastodon member's replies reach only the people they mention.
 - Announces from **remote** groups (Lemmy communities) are followed through to the activity: the object is fetched
   from its own origin, never taken from the announce.
@@ -162,6 +182,22 @@ The page's OpenGraph and Twitter tags give the title, description and image; the
 days and shared by every account on the server. Images are served to clients only through PrivaPub's media proxy.
 `Federation:FetchLinkPreviews=false` turns page fetching off.
 
+## Server descriptions and the crawler
+
+PrivaPub keeps statistics about servers, never about accounts (see `/stargazing` on the server).
+- **Describing a server:** a server it exchanges activities with is described at most once a week, from:
+  - `/.well-known/nodeinfo` and the NodeInfo document it links;
+  - `/api/v2/instance`, falling back to `/api/v1/instance`.
+
+  These requests are unsigned, because they are not ActivityPub documents.
+- **The crawler** is on at privapub.thepra.dev. It identifies as
+  `PrivaPub-Stargazer/<version> (+https://privapub.thepra.dev/stargazing)`.
+  - **What it reads:** `/robots.txt`, then the documents above and `/api/v1/instance/peers`, and nothing else: no
+    accounts, posts or directories.
+  - **How often:** one server a minute, each at most weekly.
+  - **Opting out:** in robots.txt, the crawler obeys the group `PrivaPub-Stargazer`, then `PrivaPub`, then `*`. A
+    robots.txt that answers with a server error or times out also keeps it out, as do this server's domain blocks.
+
 ## Local-only posts
 
 Posts with a location (shown to nearby users of this server) never leave the server, in any form.
@@ -176,12 +212,22 @@ Posts with a location (shown to nearby users of this server) never leave the ser
   deletes, must be on its actor's origin. An embedded object from another origin is fetched from that origin.
 - **Fetching.** All fetches are signed by the instance actor. They go only to public addresses, follow at most three
   redirects and read at most 1 MB.
+- **Reading our documents (SecureMode).** privapub.thepra.dev answers ActivityPub GETs only when they are signed, like
+  Mastodon's authorized fetch; the instance actor `/peasants/privapub` is the exception, since its key is needed first.
+  A browser asking for HTML is redirected to the public page instead.
+- **Posts that are not public** (followers-only, direct, circle) are served to a signed request from someone they were
+  for, or from the instance actor of a server where someone they were for lives, and to nobody else (404). Once deleted
+  they answer those same readers 410. A direct message's `context`, `/peasants/{name}/whispers/{id}`, is an
+  `OrderedCollection` of the conversation's posts for its participants.
 - **HTML.** Received HTML is sanitised to Mastodon's allowlist.
 - **Keys we cannot fetch for now.** When a sender's key cannot be fetched because its server timed out or answered
   5xx, the inbox answers 503 with `Retry-After: 300` rather than 401.
-- **Activity ids.** `Create` and `Announce` ids dereference. `Follow`, `Like`, `Block` and the `Accept`, `Reject` and
+- **Activity ids.** `Create` and `Announce` ids dereference, a community's announces included, until the post they
-  `Undo` that answer them do not, because serving them would reveal who follows, likes and blocks whom; they are always
+  carry is deleted (then 410); a persona's boost id sends a browser to the boosted post. `Follow`, `Like`, `Block` and
-  sent with their object embedded.
+  the `Accept`, `Reject` and `Undo` that answer them do not, because serving them would reveal who follows, likes and
+  blocks whom. Neither do `Update`, `Delete`, `EmojiReact`, `QuoteRequest` and its answers, `Flag`, `Ignore` or poll
+  votes. All of them are always sent with their object embedded.
+- **Hashtags.** A post's `Hashtag` links go to `/tags/{tag}`, a public page of this server's public posts with that tag.
 - **Delivery.** Failed deliveries are retried with Mastodon's backoff (16 attempts). A host that keeps failing is paused,
   starting at an hour and growing to a week.
 
@@ -190,5 +236,7 @@ Posts with a location (shown to nearby users of this server) never leave the ser
 - Our own posts carry no custom emoji: emoji are received and shown, not offered.
 - Remote media is fetched through this server's proxy when a local client displays it. Video and audio are streamed
   through it with byte ranges passed on, so a PeerTube file is never fetched whole for one viewer.
-- Collections expose counts, not members.
+- Collections expose counts, not members: `/groupies` and `/stalking` give the same totals as the Mastodon API's
+  follower and following counts, and the outbox's `totalItems` is the persona's post count, though only public posts
+  are listed. `/api/v1/instance/peers` is empty: which servers this one talks to is not published.
 - Only `rsa-sha256`-style keys are verified. RFC 9421 signatures are planned.

PrivaPub.ClientModels/User/RemoveSelfForm.cs

@@ -0,0 +1,14 @@
+using PrivaPub.ClientModels.Resources;
+
+using System.ComponentModel.DataAnnotations;
+
+namespace PrivaPub.ClientModels.User
+{
+	// Deleting one's own login, and with it every persona and group it owns, asks for the password again.
+	public class RemoveSelfForm
+	{
+		[Required(ErrorMessageResourceName = "Required", ErrorMessageResourceType = typeof(ErrorsResource)),
+			Display(Name = "Password", ResourceType = typeof(FieldsNameResource))]
+		public string Password { get; set; }
+	}
+}

PrivaPub.Tests/Domain/ContentRendererTests.cs

@@ -60,6 +60,7 @@ namespace PrivaPub.Tests.Domain
 		{
 			public string BaseAddress => Base;
 
+			public Task<GoneActor> Gone(string userName, CancellationToken token) => Task.FromResult<GoneActor>(default);
 			public Task<LocalActor> FindByUserName(string userName, CancellationToken token) =>
 				Task.FromResult(userName.Equals("alice", StringComparison.OrdinalIgnoreCase)
 					? new LocalActor { Id = "a1", UserName = "alice", BaseAddress = Base, Kind = LocalActorKind.Person }

PrivaPub.Tests/Domain/OutboxTests.cs

@@ -65,6 +65,8 @@ namespace PrivaPub.Tests.Domain
 			var sent = await _harness.Outgoing(follower.SharedInbox);
 			Assert.Equal(new[] { "Create", "Update", "Delete" }, sent.Select(a => a["type"]!.GetValue<string>()));
 			Assert.DoesNotContain(sent[0]["to"]!.AsArray(), n => n!.GetValue<string>().EndsWith("#Public"));
+			// Pleroma reads an empty cc without a "/followers" address as a direct message
+			Assert.Contains(sent[0]["object"]!["cc"]!.AsArray(), n => n!.GetValue<string>() == alice.Followers);
 			Assert.Equal("cw", sent[1]["object"]!["summary"]!.GetValue<string>());
 			Assert.NotNull(sent[1]["object"]!["updated"]);
 			Assert.Equal(sent[0]["to"]!.ToJsonString(), sent[2]["to"]!.ToJsonString());

PrivaPub.Tests/Federation/GroupTests.cs

@@ -9,6 +9,7 @@ using PrivaPub.Models.Federation;
 using PrivaPub.Models.Group;
 using PrivaPub.Models.Post;
 using PrivaPub.Models.Social;
+using PrivaPub.StaticServices;
 using PrivaPub.Tests.Support;
 
 using System.Text.Json.Nodes;
@@ -138,21 +139,86 @@ namespace PrivaPub.Tests.Federation
 			Assert.Equal(PostVisibility.Circle, outcome.Post.Visibility);
 			var create = Assert.Single(await _harness.Outgoing(member.Id + "/inbox"));
 			Assert.Equal(new[] { circle.Uri, circle.Flock }, create["object"]!["to"]!.AsArray().Select(t => t!.GetValue<string>()));
+			// the member's copy names the member, so Mastodon and GoToSocial keep it, and names nobody else
+			Assert.Equal(new[] { member.Id }, create["cc"]!.AsArray().Select(t => t!.GetValue<string>()));
+			Assert.Equal(new[] { member.Id }, create["object"]!["cc"]!.AsArray().Select(t => t!.GetValue<string>()));
+			Assert.Contains(create["object"]!["tag"]!.AsArray(), t => t!["type"]!.GetValue<string>() == "Mention" && t["href"]!.GetValue<string>() == member.Id);
 			Assert.DoesNotContain(Addressing.Public, create.ToJsonString());
 			Assert.Empty(await _harness.Outgoing(follower.SharedInbox));
 			Assert.Empty((await _harness.Outgoing(member.SharedInbox)).Where(a => a["type"]!.GetValue<string>() == "Announce"));
 
-			var authorizer = new SignedFetchAuthorizer(_harness.Remote);
+			var authorizer = new SignedFetchAuthorizer(_harness.Remote, new DbEntities());
 			var path = new Uri(outcome.Post.ObjectURI).AbsolutePath;
 			var asMember = await authorizer.Requester(member.Get(Harness.Host, path), token);
 			var asOutsider = await authorizer.Requester(outsider.Get(Harness.Host, path), token);
 			Assert.True(SignedFetchAuthorizer.MayReadCircle(circleEntity, asMember));
 			Assert.False(SignedFetchAuthorizer.MayReadCircle(circleEntity, asOutsider));
 			Assert.False(SignedFetchAuthorizer.MayReadCircle(circleEntity, default));
+			Assert.True(await authorizer.MayRead(outcome.Post, asMember, token));
+			Assert.False(await authorizer.MayRead(outcome.Post, asOutsider, token));
+			Assert.Equal(new[] { member.Id }, SignedFetchAuthorizer.CircleReaders(circleEntity, asMember));
 			Assert.True(circle.IsCircle);
 			Assert.False(circle.Discoverable);
 		}
 
+		[Fact]
+		public async Task A_circle_posts_edit_and_delete_reach_each_member_naming_only_that_member()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var (_, alice) = await _harness.Persona("alice");
+			var first = new RemoteActor(_harness.Peer, "first");
+			var second = new RemoteActor(_harness.Peer, "second", _harness.Peer.B);
+			var (_, circle) = await Group(GroupKind.Circle, PostingPolicy.Followers, alice.Id, first.Id, second.Id);
+			await _harness.Remote.GetActor(first.Id, refresh: false, token);
+			await _harness.Remote.GetActor(second.Id, refresh: false, token);
+
+			var outcome = await _harness.Statuses.Publish(alice, new StatusDraft { Text = "just us", GroupId = circle.Id }, token);
+			await _harness.Statuses.Edit(alice, outcome.Post.ID, new StatusDraft { Text = "just us, edited" }, token);
+			await _harness.Statuses.Remove(alice, outcome.Post.ID, token);
+
+			foreach (var (member, other) in new[] { (first, second), (second, first) })
+			{
+				var sent = await _harness.Outgoing(member.Id + "/inbox");
+				Assert.Equal(new[] { "Create", "Update", "Delete" }, sent.Select(a => a["type"]!.GetValue<string>()));
+				Assert.All(sent, a => Assert.Contains(member.Id, a["cc"]!.AsArray().Select(c => c!.GetValue<string>())));
+				Assert.All(sent, a => Assert.DoesNotContain(other.Id, a.ToJsonString()));
+			}
+		}
+
+		[Fact]
+		public async Task A_reply_to_a_circle_post_stays_in_it_and_a_circle_post_asks_nobody_outside_for_a_quote()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var (_, alice) = await _harness.Persona("alice");
+			var (_, bob) = await _harness.Persona("bob");
+			var (entity, circle) = await Group(GroupKind.Circle, PostingPolicy.Followers, alice.Id);
+			entity.Members.Add(new GroupMember { AvatarId = bob.Id });
+			await DB.Default.SaveAsync(entity, token);
+			var outsider = new RemoteActor(_harness.Peer, "asked");
+			var outsiderAccount = await _harness.Remote.GetActor(outsider.Id, refresh: false, token);
+			var asksFirst = new Post
+			{
+				ObjectURI = $"{Origin(outsider)}/notes/{Guid.NewGuid():N}",
+				ActorURI = outsider.Id,
+				GroupUserId = outsiderAccount.ID,
+				AuthorAccountId = outsiderAccount.ID,
+				IsFederatedCopy = true,
+				Visibility = PostVisibility.Public,
+				ContentHtml = "<p>ask me first</p>",
+				QuotePolicy = new InteractionRule { Manual = new() { Addressing.Public } }
+			};
+			await DB.Default.SaveAsync(asksFirst, token);
+
+			var root = await _harness.Statuses.Publish(alice, new StatusDraft { Text = "just us", GroupId = circle.Id }, token);
+			var reply = await _harness.Statuses.Publish(bob, new StatusDraft { Text = "still just us", InReplyTo = root.Post.ID }, token);
+			var quote = await _harness.Statuses.Publish(alice, new StatusDraft { Text = "look", GroupId = circle.Id, QuotedStatusId = asksFirst.ID }, token);
+
+			Assert.Equal(PostVisibility.Circle, reply.Post.Visibility);
+			Assert.Equal(circle.Id, reply.Post.GroupId);
+			Assert.Equal(422, quote.Status);
+			Assert.Empty(await _harness.Outgoing(outsider.Id + "/inbox"));
+		}
+
 		[Fact]
 		public async Task Only_circle_members_can_post_into_a_circle()
 		{

PrivaPub.Tests/Federation/ObjectShapesTests.cs

@@ -1,4 +1,4 @@
-using PrivaPub.Api.Mastodon.Mappers;
+using PrivaPub.Api.Mastodon.Mappers;
 using PrivaPub.Federation.Objects;
 using PrivaPub.Models.Post;
 
@@ -79,6 +79,51 @@ namespace PrivaPub.Tests.Federation
 			Assert.Equal("2026-10-03 10:00 – 13:00 (Europe/Rome) · Biblioteca", MastodonMapper.EventLine(note.Event));
 		}
 
+		[Fact]
+		public void Keeps_a_pixelfed_place_whose_coordinates_are_strings()
+		{
+			var note = Parse("""
+				{
+					"id": "https://pixel.example/p/ann/1", "type": "Note", "attributedTo": "https://pixel.example/users/ann", "content": "<p>view</p>",
+					"location": { "type": "Place", "name": "Tokyo", "longitude": "139.6917", "latitude": "35.6895", "country": "Japan" },
+					"commentsEnabled": true
+				}
+				""");
+
+			Assert.Equal(("Tokyo", 35.6895, 139.6917, "Japan"), (note.Place.Name, note.Place.Latitude, note.Place.Longitude, note.Place.Country));
+			Assert.Null(note.Event);
+		}
+
+		[Theory]
+		[InlineData("null")]
+		[InlineData("""{ "type": "Place", "name": "Nowhere" }""")]
+		[InlineData("""{ "type": "Place", "name": "Off the map", "latitude": 123, "longitude": 9 }""")]
+		[InlineData("""{ "type": "Place", "latitude": "north", "longitude": "9.19" }""")]
+		[InlineData("""{ "type": "VirtualLocation", "url": "https://meet.example/a", "latitude": 45, "longitude": 9 }""")]
+		public void Has_no_place_without_a_place_with_coordinates(string location)
+		{
+			var note = Parse($$"""
+				{ "id": "https://pixel.example/p/ann/2", "type": "Note", "attributedTo": "https://pixel.example/users/ann", "content": "<p>x</p>", "location": {{location}} }
+				""");
+
+			Assert.Null(note.Place);
+		}
+
+		[Fact]
+		public void An_events_location_stays_the_events_own()
+		{
+			var note = Parse("""
+				{
+					"id": "https://events.example/events/10", "type": "Event", "name": "Picnic", "startTime": "2026-10-03T10:00:00+02:00",
+					"location": { "type": "Place", "name": "Park", "latitude": 45.07, "longitude": 7.68 },
+					"attributedTo": "https://events.example/@club"
+				}
+				""");
+
+			Assert.Null(note.Place);
+			Assert.Equal("Park", Assert.Single(note.Event.Places).Name);
+		}
+
 		[Fact]
 		public void Keeps_a_lemmy_link_post_as_a_link_with_its_thumbnail()
 		{
@@ -190,7 +235,7 @@ namespace PrivaPub.Tests.Federation
 		}
 
 		[Fact]
-		public void Reads_polls_from_mastodon_misskey_and_closed_ones()
+		public void Reads_polls_from_mastodon_misskey_akkoma_and_closed_ones()
 		{
 			var mastodon = Parse("""
 				{ "id": "https://m.example/q/1", "type": "Question", "attributedTo": "https://m.example/u", "content": "?", "endTime": "2026-10-02T00:00:00Z", "votersCount": 7,
@@ -204,6 +249,10 @@ namespace PrivaPub.Tests.Federation
 				{ "id": "https://g.example/q/1", "type": "Question", "attributedTo": "https://g.example/u", "content": "?", "closed": "2026-09-30T12:00:00Z",
 					"oneOf": [{ "type": "Note", "name": "p" }, { "type": "Note", "name": "q" }] }
 				""");
+			var akkoma = Parse("""
+				{ "id": "https://a.example/objects/1", "type": "Question", "attributedTo": "https://a.example/users/u", "content": "?", "closed": "2099-01-01T00:00:00.000000Z",
+					"oneOf": [{ "type": "Note", "name": "p" }, { "type": "Note", "name": "q" }] }
+				""");
 
 			Assert.False(mastodon.Poll.Multiple);
 			Assert.Equal(new[] { 4, 3 }, mastodon.Poll.Options.Select(o => o.Votes));
@@ -212,6 +261,8 @@ namespace PrivaPub.Tests.Federation
 			Assert.Equal(new[] { 2, 5 }, misskey.Poll.Options.Select(o => o.Votes));
 			Assert.Null(misskey.Poll.VotersCount);
 			Assert.Equal(new DateTime(2026, 9, 30, 12, 0, 0, DateTimeKind.Utc), closed.Poll.ClosedAt);
+			Assert.Null(akkoma.Poll.ClosedAt);
+			Assert.Equal(new DateTime(2099, 1, 1, 0, 0, 0, DateTimeKind.Utc), akkoma.Poll.ExpiresAt);
 		}
 
 		[Fact]

PrivaPub.Tests/Federation/RemoteEditsTests.cs

@@ -0,0 +1,38 @@
+using PrivaPub.Federation.Inbox;
+using PrivaPub.Federation.Objects;
+using PrivaPub.Models.Post;
+
+namespace PrivaPub.Tests.Federation
+{
+	public class RemoteEditsTests
+	{
+		static readonly DateTime Published = new(2026, 10, 3, 10, 40, 1, DateTimeKind.Utc);
+
+		static Post Stored(DateTime? editedAt = default) => new() { CreationDate = Published, EditedAt = editedAt, ContentHtml = "<p>before</p>" };
+
+		[Fact]
+		public void A_newer_update_is_an_edit_and_an_update_without_a_date_is_a_refresh()
+		{
+			Assert.True(RemoteEdits.IsEdit(new NoteDocument { Updated = Published.AddSeconds(1), ContentHtml = "<p>before</p>" }, Stored()));
+			Assert.False(RemoteEdits.IsEdit(new NoteDocument { ContentHtml = "<p>after</p>" }, Stored()));
+			Assert.False(RemoteEdits.IsEdit(new NoteDocument { Updated = Published.AddSeconds(-1), ContentHtml = "<p>after</p>" }, Stored()));
+		}
+
+		[Fact]
+		public void An_edit_in_the_second_the_post_was_published_counts_when_the_text_changed()
+		{
+			Assert.True(RemoteEdits.IsEdit(new NoteDocument { Updated = Published, ContentHtml = "<p>after</p>" }, Stored()));
+			Assert.True(RemoteEdits.IsEdit(new NoteDocument { Updated = Published, ContentHtml = "<p>before</p>", SpoilerText = "now with a warning" }, Stored()));
+			Assert.False(RemoteEdits.IsEdit(new NoteDocument { Updated = Published, ContentHtml = "<p>before</p>" }, Stored()));
+		}
+
+		[Fact]
+		public void After_a_first_edit_only_a_newer_one_counts()
+		{
+			var edited = Published.AddMinutes(1);
+
+			Assert.False(RemoteEdits.IsEdit(new NoteDocument { Updated = edited, ContentHtml = "<p>again</p>" }, Stored(edited)));
+			Assert.True(RemoteEdits.IsEdit(new NoteDocument { Updated = edited.AddSeconds(1), ContentHtml = "<p>again</p>" }, Stored(edited)));
+		}
+	}
+}

PrivaPub.Tests/Http/ClientApiAccountsTests.cs

@@ -6,6 +6,8 @@ using MongoDB.Entities;
 using PrivaPub.ClientModels;
 using PrivaPub.Models.Group;
 using PrivaPub.Models.User;
+using PrivaPub.Services;
+using PrivaPub.Models.Jobs;
 using PrivaPub.Tests.Support;
 using PrivaPub.Tests.Support.Host;
 
@@ -136,9 +138,11 @@ namespace PrivaPub.Tests.Http
 
 			Assert.Equal(HttpStatusCode.OK, ok.StatusCode);
 			Assert.Equal(root.Id, (await ok.JsonBody())["userId"]!.GetValue<string>());
+			// a wrong password and an unknown login get the same answer, so sign-in tells nobody which logins exist
 			Assert.Equal(HttpStatusCode.BadRequest, wrong.StatusCode);
-			Assert.Equal("Wrong password.", await Message(wrong));
+			Assert.Equal(RootUsersService.NoMatch, await Message(wrong));
 			Assert.Equal(HttpStatusCode.BadRequest, unknown.StatusCode);
+			Assert.Equal(await Message(wrong), await Message(unknown));
 			Assert.Equal(HttpStatusCode.OK, logout.StatusCode);
 			Assert.Equal(HttpStatusCode.Unauthorized, anonymousLogout.StatusCode);
 		}
@@ -290,42 +294,59 @@ namespace PrivaPub.Tests.Http
 		}
 
 		[Fact]
-		public async Task Recovery_without_an_email_is_refused()
+		public async Task Recovery_answers_the_same_whoever_asks_and_queues_the_work()
 		{
-			var root = await _host.SignUp("noemail");
+			var token = TestContext.Current.CancellationToken;
+			var since = DateTime.UtcNow.AddSeconds(-1);
+			var withEmail = await _host.SignUp("withemail");
+			var withoutEmail = await _host.SignUp("noemail");
+			var email = $"{Guid.NewGuid():N}@example.test";
+			using (var signedIn = _host.As(withEmail.Jwt))
+				Assert.Equal(HttpStatusCode.OK, (await signedIn.PostJson("/clientapi/user/update", new { email })).StatusCode);
 			using var client = _host.Client();
 
-			var response = await client.PostJson("/clientapi/user/recover/password", new { userName = root.UserName });
+			var answers = new[]
-			var unknown = await client.PostJson("/clientapi/user/recover/password", new { userName = Name("nobody") });
+			{
-			var neither = await client.PostJson("/clientapi/user/recover/password", new { });
+				await client.PostJson("/clientapi/user/recover/password", new { userName = withEmail.UserName }),
+				await client.PostJson("/clientapi/user/recover/password", new { email }),
+				await client.PostJson("/clientapi/user/recover/password", new { userName = withoutEmail.UserName }),
+				await client.PostJson("/clientapi/user/recover/password", new { userName = Name("nobody") }),
+				await client.PostJson("/clientapi/user/recover/password", new { email = $"{Guid.NewGuid():N}@example.test" })
+			};
+			var bodies = new List<string>();
+			foreach (var answer in answers)
+			{
+				Assert.Equal(HttpStatusCode.OK, answer.StatusCode);
+				bodies.Add(await answer.Content.ReadAsStringAsync(token));
+			}
 
-			Assert.Equal(HttpStatusCode.Locked, response.StatusCode);
+			Assert.Single(bodies.Distinct());
-			Assert.Contains("doesn't have an email", await Message(response));
+			Assert.Contains("recovery link is on its way", bodies[0]);
-			Assert.False(await DB.Default.Find<EmailRecovery>().Match(r => r.RootUserId == root.Id).ExecuteAnyAsync(TestContext.Current.CancellationToken));
+			var queued = await DB.Default.Find<Job>().Match(j => j.Kind == JobKind.SendRecovery && j.CreatedAt >= since).ExecuteAsync(token);
-			Assert.Equal(HttpStatusCode.NotFound, unknown.StatusCode);
+			Assert.True(queued.Count >= answers.Length);
-			Assert.Equal(HttpStatusCode.BadRequest, neither.StatusCode);
+			Assert.Contains(queued, j => j.Payload.Contains(withEmail.Id));
+			Assert.Equal(HttpStatusCode.BadRequest, (await client.PostJson("/clientapi/user/recover/password", new { })).StatusCode);
 		}
 
 		[Fact]
-		public async Task Recovery_through_an_unreachable_mail_server_says_so_and_nothing_more()
+		public async Task The_recovery_job_keeps_only_a_hash_and_an_unreachable_mail_server_says_nothing_to_anyone()
 		{
+			var token = TestContext.Current.CancellationToken;
 			var root = await _host.SignUp("smtp");
 			var email = $"{Guid.NewGuid():N}@example.test";
 			using (var signedIn = _host.As(root.Jwt))
 				Assert.Equal(HttpStatusCode.OK, (await signedIn.PostJson("/clientapi/user/update", new { email })).StatusCode);
 			using var client = _host.Client();
 
-			var byName = await client.PostJson("/clientapi/user/recover/password", new { userName = root.UserName });
+			var answer = await client.PostJson("/clientapi/user/recover/password", new { userName = root.UserName });
-			var byEmail = await client.PostJson("/clientapi/user/recover/password", new { email });
+			await _host.Run(j => j.Kind == JobKind.SendRecovery && j.Payload.Contains(root.Id), token);
 
-			foreach (var response in new[] { byName, byEmail })
+			Assert.Equal(HttpStatusCode.OK, answer.StatusCode);
-			{
+			var recovery = await DB.Default.Find<EmailRecovery>().Match(r => r.RootUserId == root.Id).ExecuteFirstAsync(token);
-				var body = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+			Assert.NotNull(recovery);
-				Assert.Equal(HttpStatusCode.ServiceUnavailable, response.StatusCode);
+			Assert.Null(recovery.RecoveryCode);
-				Assert.Equal("Failed to send email.", JsonNode.Parse(body)!["errorMessage"]!.GetValue<string>());
+			Assert.Equal(64, recovery.CodeHash.Length);
-				foreach (var leak in new[] { "xception", "efused", "ocket", "127.0.0.1", "smtp", "SMTP", "  at " })
+			Assert.InRange(recovery.ExpiresAt, DateTime.UtcNow.AddMinutes(50), DateTime.UtcNow.AddMinutes(61));
-					Assert.DoesNotContain(leak, body);
-			}
 		}
 
 		[Fact]
@@ -348,7 +369,10 @@ namespace PrivaPub.Tests.Http
 		{
 			var root = await _host.SignUp("recover");
 			var code = Guid.NewGuid().ToString("N") + Guid.NewGuid().ToString("N");
-			await DB.Default.SaveAsync(new EmailRecovery { RootUserId = root.Id, RecoveryCode = code }, TestContext.Current.CancellationToken);
+			await DB.Default.SaveAsync(new EmailRecovery { RootUserId = root.Id, CodeHash = RecoveryJob.Hash(code), ExpiresAt = DateTime.UtcNow.AddHours(1) },
+				TestContext.Current.CancellationToken);
+			var persona = await _host.Persona(root, "recovered");
+			var apiToken = await _host.MastodonToken(persona);
 			using var client = _host.Client();
 
 			var valid = await client.PostAsync("/clientapi/user/recover/valid", new StringContent($"\"{code}\"", Encoding.UTF8, "application/json"), TestContext.Current.CancellationToken);
@@ -361,6 +385,29 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal(HttpStatusCode.BadRequest, (await LogIn(root.UserName, root.Password)).StatusCode);
 			Assert.Equal(HttpStatusCode.OK, (await LogIn(root.UserName, NewPassword)).StatusCode);
 			Assert.False(await DB.Default.Find<EmailRecovery>().Match(r => r.RootUserId == root.Id).ExecuteAnyAsync(TestContext.Current.CancellationToken));
+			// whoever held the old sessions may be why the password was recovered: they end
+			using (var oldSession = _host.As(root.Jwt))
+				Assert.Equal(HttpStatusCode.Unauthorized, (await oldSession.GetAsync("/clientapi/user/sniff/again", TestContext.Current.CancellationToken)).StatusCode);
+			using (var oldApp = _host.Client())
+			{
+				oldApp.DefaultRequestHeaders.Authorization = new("Bearer", apiToken);
+				Assert.Equal(HttpStatusCode.Unauthorized, (await oldApp.GetAsync("/api/v1/accounts/verify_credentials", TestContext.Current.CancellationToken)).StatusCode);
+			}
+		}
+
+		[Fact]
+		public async Task An_expired_recovery_code_changes_nothing()
+		{
+			var root = await _host.SignUp("expired");
+			var code = Guid.NewGuid().ToString("N") + Guid.NewGuid().ToString("N");
+			await DB.Default.SaveAsync(new EmailRecovery { RootUserId = root.Id, CodeHash = RecoveryJob.Hash(code), ExpiresAt = DateTime.UtcNow.AddMinutes(-1) },
+				TestContext.Current.CancellationToken);
+			using var client = _host.Client();
+
+			var change = await client.PostJson("/clientapi/user/recover/update/password", new { newPassword = NewPassword, repeatedPassword = NewPassword, recoveryCode = code });
+
+			Assert.Equal(HttpStatusCode.NotFound, change.StatusCode);
+			Assert.Equal(HttpStatusCode.OK, (await LogIn(root.UserName, root.Password)).StatusCode);
 		}
 
 		[Fact]

PrivaPub.Tests/Http/ClientApiPersonasTests.cs

@@ -154,6 +154,34 @@ namespace PrivaPub.Tests.Http
 			Assert.DoesNotContain(persona.Root.UserName, update.ToJsonString());
 		}
 
+		[Fact]
+		public async Task A_theme_change_here_keeps_what_the_mastodon_api_set()
+		{
+			var persona = await _host.Persona(await _host.SignUp("keep"), "keep");
+			await DB.Default.Update<Avatar>().MatchID(persona.Id)
+				.Modify(a => a.Settings.IsDiscoverable, false)
+				.Modify(a => a.Settings.IsLocked, true)
+				.Modify(a => a.Settings.QuotePolicy, QuotePolicies.Nobody)
+				.ExecuteAsync(TestContext.Current.CancellationToken);
+			using var client = _host.As(persona.Root.Jwt);
+
+			var response = await client.PostJson("/clientapi/avatar/private/update", new
+			{
+				avatarId = persona.Id,
+				name = "Kept",
+				biography = "same settings",
+				settings = new { isDefault = false, darkThemeIndexColour = 100, themeIsDarkMode = true }
+			});
+
+			Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+			var settings = (await DB.Default.Find<Avatar>().MatchID(persona.Id).ExecuteFirstAsync(TestContext.Current.CancellationToken)).Settings;
+			Assert.True(settings.ThemeIsDarkMode);
+			Assert.Equal(100, settings.DarkThemeIndexColour);
+			Assert.False(settings.IsDiscoverable);
+			Assert.True(settings.IsLocked);
+			Assert.Equal(QuotePolicies.Nobody, settings.QuotePolicy);
+		}
+
 		[Fact]
 		public async Task Updating_another_roots_persona_is_refused()
 		{

PrivaPub.Tests/Http/FederationGetTests.cs

@@ -142,7 +142,9 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal(ActivityJson, outbox.MediaType);
 			Assert.Equal("OrderedCollection", outbox.Json["type"]!.GetValue<string>());
 			Assert.Equal(persona.ActorUri() + "/anus", outbox.Json["id"]!.GetValue<string>());
-			Assert.Equal(22, outbox.Json["totalItems"]!.GetValue<int>());
+			// statuses_count, as Mastodon counts it: everything but the DM, the deleted post and the copy of a remote post,
+			// the followers-only and located posts and the boost included; only the public posts are listed
+			Assert.Equal(24, outbox.Json["totalItems"]!.GetValue<int>());
 			Assert.Null(outbox.Json["orderedItems"]);
 			var first = outbox.Json["first"]!.GetValue<string>();
 			Assert.Equal(persona.ActorUri() + "/anus?page=true", first);
@@ -221,7 +223,7 @@ namespace PrivaPub.Tests.Http
 			Assert.DoesNotContain(pending, followers.Text);
 			Assert.Equal(HttpStatusCode.OK, following.Status);
 			Assert.Equal(persona.ActorUri() + "/stalking", following.Json["id"]!.GetValue<string>());
-			Assert.Equal(0, following.Json["totalItems"]!.GetValue<int>());
+			Assert.Equal(1, following.Json["totalItems"]!.GetValue<int>());//counted, as following_count says, never listed
 			Assert.DoesNotContain(friend.UserName, following.Text);
 		}
 
@@ -322,11 +324,66 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal(new[] { circle.Uri, circle.Uri + "/flock" }, Strings(asMember.Json["to"]));
 			Assert.DoesNotContain(ActivityPubRenderer.Public, asMember.Text);
 			Assert.Equal(HttpStatusCode.OK, asMemberServer.Status);
+			// a refetch names the member, as the member's copy did; the instance actor sees the members on its server only
+			Assert.Equal(new[] { member.Id }, Strings(asMember.Json["cc"]));
+			Assert.Equal(new[] { member.Id }, Strings(asMemberServer.Json["cc"]));
 			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(path)).Status);
 			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(path, Browser)).Status);
 			foreach (var outsider in new[] { neighbour, stranger, strangerServer })
 				Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(outsider.SignedGet(path))).Status);
-			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch($"/peasants/{owner.UserName}/grunts/create-{post.ID}")).Status);
+			var create = $"/peasants/{owner.UserName}/grunts/create-{post.ID}";
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(create)).Status);
+			var createAsMember = await _client.Fetch(member.SignedGet(create));
+			Assert.Equal(HttpStatusCode.OK, createAsMember.Status);
+			Assert.Equal(post.ObjectURI, createAsMember.Json["object"]!["id"]!.GetValue<string>());
+			Assert.Equal(new[] { member.Id }, Strings(createAsMember.Json["object"]!["cc"]));
+		}
+
+		[Fact]
+		public async Task Followers_only_and_direct_posts_are_served_to_signed_fetches_from_those_they_were_for()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var owner = await _host.Persona(await _host.SignUp(), "private");
+			var follower = new RemoteActor(_peer, "follower");
+			var followerServer = new RemoteActor(_peer, "instance", type: "Application");
+			var recipient = new RemoteActor(_peer, "recipient");
+			var stranger = new RemoteActor(_peer, "stranger", _peer.B);
+			_peer.WebFinger(recipient);
+			await DB.Default.SaveAsync(new Follower
+			{
+				LocalActorId = owner.Id,
+				LocalActorKind = LocalActorKind.Person,
+				ActorURI = follower.Id,
+				InboxURL = follower.Id + "/inbox"
+			}, token);
+			var quiet = await _host.Publish(owner, "for followers", PostVisibility.FollowersOnly);
+			var direct = await _host.Publish(owner, new StatusDraft { Text = $"@{recipient.Handle()} just you", PlainText = true, Visibility = PostVisibility.Direct });
+			var quietPath = $"/peasants/{owner.UserName}/scribbles/{quiet.ID}";
+			var directPath = $"/peasants/{owner.UserName}/scribbles/{direct.ID}";
+
+			Assert.Equal(HttpStatusCode.OK, (await _client.Fetch(follower.SignedGet(quietPath))).Status);
+			Assert.Equal(HttpStatusCode.OK, (await _client.Fetch(followerServer.SignedGet(quietPath))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(stranger.SignedGet(quietPath))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(quietPath)).Status);
+			var asRecipient = await _client.Fetch(recipient.SignedGet(directPath));
+			Assert.Equal(HttpStatusCode.OK, asRecipient.Status);
+			Assert.Contains(recipient.Id, Strings(asRecipient.Json["to"]));
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(follower.SignedGet(directPath))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(directPath)).Status);
+
+			// the DM's context is the conversation, for its participants only
+			var context = PathOf(asRecipient.Json["context"]!.GetValue<string>());
+			var conversation = await _client.Fetch(recipient.SignedGet(context));
+			Assert.Equal(HttpStatusCode.OK, conversation.Status);
+			Assert.Equal(new[] { direct.ObjectURI }, Strings(conversation.Json["orderedItems"]));
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(stranger.SignedGet(context))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(context)).Status);
+
+			// once deleted, those it was for learn it is gone; everyone else still learns nothing
+			await _host.Remove(owner, quiet);
+			Assert.Equal(HttpStatusCode.Gone, (await _client.Fetch(follower.SignedGet(quietPath))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(stranger.SignedGet(quietPath))).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await _client.Fetch(quietPath)).Status);
 		}
 
 		[Fact]
@@ -463,6 +520,10 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal("Application", instance.Json["type"]!.GetValue<string>());
 			foreach (var path in paths[..^1])
 				Assert.True((await client.Fetch(reader.SignedGet(path))).Status == HttpStatusCode.OK, $"{path} refused a signed GET");
+			// a browser is not asked for a signature: it is only sent to the public pages
+			var browser = await client.Fetch($"/peasants/{persona.UserName}", Browser);
+			Assert.Equal(HttpStatusCode.Redirect, browser.Status);
+			Assert.Equal(HttpStatusCode.Redirect, (await client.Fetch($"/peasants/{persona.UserName}/scribbles/{post.ID}", Browser)).Status);
 		}
 	}
 }

PrivaPub.Tests/Http/InstanceLocationTests.cs

@@ -0,0 +1,291 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.Jobs;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Net;
+using System.Text.Json.Nodes;
+
+namespace PrivaPub.Tests.Http
+{
+	// Where a server is, on the public instance API: where it was located (city, coordinates and network, whatever its size),
+	// only the CDN's name for a CDN-fronted one, the batch form, and this server itself.
+	[Trait("Category", "Integration")]
+	public sealed class InstanceLocationTests : IAsyncLifetime
+	{
+		PrivaPubHost _host;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_host = await PrivaPubHost.Shared();
+		}
+
+		public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+
+		static CancellationToken Token => TestContext.Current.CancellationToken;
+
+		static async Task<string> Instance(int users, InstanceGeo geo, string name = "located")
+		{
+			var host = $"{name}{Guid.NewGuid():N}.example";
+			await DB.Default.SaveAsync(new RemoteInstance { Host = host, Software = "mastodon", UsersTotal = users, Geo = geo }, Token);
+			return host;
+		}
+
+		static InstanceGeo Milan(string cdn = default) => new()
+		{
+			Country = "IT",
+			City = "Milan",
+			Latitude = 45.5,
+			Longitude = 9.2,
+			Asn = 12345,
+			AsnOrg = "Example Hosting",
+			Cdn = cdn,
+			Ipv6 = true,
+			Source = "DB-IP Lite 2026-10",
+			LocatedAt = DateTime.UtcNow.AddDays(-2)
+		};
+
+		async Task<JsonNode> Geo(string host) => (await _host.Client().Get($"/api/privapub/v1/instances/{host}")).Ok().Body["geo"];
+
+		[Fact]
+		public async Task A_located_server_shows_its_city_coordinates_and_network()
+		{
+			var geo = await Geo(await Instance(50, Milan()));
+
+			Assert.Equal("city", geo.Text("precision"));
+			Assert.Equal(("IT", "Milan", "Example Hosting"), (geo.Text("country"), geo.Text("city"), geo.Text("network")));
+			Assert.Equal(45.5, geo["latitude"]!.GetValue<double>());
+			Assert.Equal(9.2, geo["longitude"]!.GetValue<double>());
+			Assert.Equal("DB-IP Lite 2026-10", geo.Text("source"));
+			Assert.NotNull(geo.Text("located_at"));
+			Assert.Null(geo["asn"]);
+			Assert.Null(geo["ipv6"]);
+		}
+
+		[Fact]
+		public async Task A_one_user_server_shows_its_city_too()
+		{
+			var geo = await Geo(await Instance(1, Milan()));
+
+			Assert.Equal("city", geo.Text("precision"));
+			Assert.Equal(("IT", "Milan", "Example Hosting"), (geo.Text("country"), geo.Text("city"), geo.Text("network")));
+			Assert.Equal(45.5, geo["latitude"]!.GetValue<double>());
+		}
+
+		[Fact]
+		public async Task A_server_located_only_to_its_country_shows_the_country()
+		{
+			var geo = await Geo(await Instance(50, new InstanceGeo { Country = "IT", Source = "DB-IP Lite 2026-10", LocatedAt = DateTime.UtcNow }));
+
+			Assert.Equal("country", geo.Text("precision"));
+			Assert.Equal("IT", geo.Text("country"));
+			Assert.Null(geo["city"]);
+			Assert.Null(geo["latitude"]);
+		}
+
+		[Fact]
+		public async Task A_cdn_fronted_server_shows_only_its_cdn()
+		{
+			var geo = await Geo(await Instance(5000, Milan(cdn: "Cloudflare")));
+
+			Assert.Equal("cdn", geo.Text("precision"));
+			Assert.Equal("Cloudflare", geo.Text("cdn"));
+			Assert.Null(geo["country"]);
+			Assert.Null(geo["latitude"]);
+			Assert.Null(geo["network"]);
+		}
+
+		[Fact]
+		public async Task An_unlocated_server_has_no_place()
+		{
+			Assert.Null(await Geo(await Instance(50, default)));
+		}
+
+		[Fact]
+		public async Task The_provenance_of_a_post_carries_the_same_projection()
+		{
+			var host = await Instance(3, Milan());
+			var described = (await _host.Client().Get($"/api/privapub/v1/instances/{host}")).Ok().Body;
+
+			Assert.Equal("city", described["geo"].Text("precision"));
+			Assert.Equal(described["geo"]!.ToJsonString(), (await Geo(host))!.ToJsonString());
+		}
+
+		[Fact]
+		public async Task Several_servers_answer_at_once_in_the_order_asked_without_the_unknown_ones()
+		{
+			var big = await Instance(50, Milan(), "big");
+			var small = await Instance(3, Milan(), "small");
+			var unknown = $"unknown{Guid.NewGuid():N}.example";
+
+			var answer = (await _host.Client().Get($"/api/privapub/v1/instances?host[]={small}&host[]={unknown}&host[]={big.ToUpperInvariant()}&host[]={small}")).Ok();
+			var hosts = answer.Body!.AsArray().Select(i => i.Text("host")).ToList();
+
+			Assert.Equal(new[] { small, big }, hosts);
+			Assert.Equal("city", answer.Body![0]["geo"].Text("precision"));
+			Assert.Equal("city", answer.Body![1]["geo"].Text("precision"));
+			Assert.Empty((await _host.Client().Get("/api/privapub/v1/instances")).Ok().Body!.AsArray());
+		}
+
+		[Fact]
+		public async Task At_most_forty_servers_answer_at_once()
+		{
+			var hosts = new List<string>();
+			for (var i = 0; i < 42; i++)
+				hosts.Add(await Instance(1, default, "many"));
+
+			var answer = (await _host.Client().Get("/api/privapub/v1/instances?" + string.Join("&", hosts.Select(h => "host[]=" + h)))).Ok();
+
+			Assert.Equal(hosts.Take(40), answer.Body!.AsArray().Select(i => i.Text("host")));
+		}
+
+		[Fact]
+		public async Task This_server_describes_itself()
+		{
+			var self = (await _host.Client().Get($"/api/privapub/v1/instances/{PrivaPubHost.Host}")).Ok().Body;
+
+			Assert.Equal(PrivaPubHost.Host, self.Text("host"));
+			Assert.Equal("privapub", self.Text("software"));
+			Assert.Equal("activitypub", Assert.Single(self["protocols"]!.AsArray())!.GetValue<string>());
+			Assert.Null(self["geo"]);
+			var batch = (await _host.Client().Get($"/api/privapub/v1/instances?host[]={PrivaPubHost.Host}")).Ok().Body!.AsArray();
+			Assert.Equal("privapub", Assert.Single(batch).Text("software"));
+		}
+
+		[Fact]
+		public async Task The_owner_may_place_this_server()
+		{
+			var placed = await SelfPlacedHost.Shared();
+
+			var geo = (await placed.Client().Get($"/api/privapub/v1/instances/{PrivaPubHost.Host}")).Ok().Body["geo"];
+
+			Assert.Equal("city", geo.Text("precision"));
+			Assert.Equal(("IT", "Milan", "configured"), (geo.Text("country"), geo.Text("city"), geo.Text("source")));
+			Assert.Equal(45.5, geo["latitude"]!.GetValue<double>());
+			Assert.Equal(9.2, geo["longitude"]!.GetValue<double>());
+		}
+
+		static string WeeksAgo(int weeks) => PrivaPub.Federation.Objects.InstanceDescriber.Week(DateTime.UtcNow.AddDays(-7 * weeks));
+
+		static Task Snapshot(string host, int weeksAgo, string cdn = default, string cdnDomain = default, string city = default, double? latitude = default,
+			double? longitude = default, string country = default) =>
+			DB.Default.SaveAsync(new RemoteInstanceSnapshot
+			{
+				Host = host, Week = WeeksAgo(weeksAgo), TakenAt = DateTime.UtcNow.AddDays(-7 * weeksAgo), Reachable = true, Software = "mastodon", UsersTotal = 3,
+				Cdn = cdn, CdnDomain = cdnDomain, CdnSource = cdn == default ? default : "ranges", Country = country, City = city, Latitude = latitude, Longitude = longitude
+			}, Token);
+
+		[Fact]
+		public async Task A_cdn_fronted_server_names_its_cdn_and_where_it_was_before_it()
+		{
+			var host = await Instance(3, new InstanceGeo
+			{
+				Country = "US", City = "San Francisco", Latitude = 37.8, Longitude = -122.4, Cdn = "Cloudflare", CdnDomain = "cloudflare.com", CdnSource = "ranges",
+				Source = "DB-IP Lite 2026-10", LocatedAt = DateTime.UtcNow
+			}, "fronted");
+			await Snapshot(host, 3, city: "Berlin", latitude: 52.5, longitude: 13.4, country: "DE");
+			await Snapshot(host, 2, city: "Hamburg", latitude: 53.6, longitude: 10.0, country: "DE");
+			await Snapshot(host, 1, cdn: "Cloudflare", cdnDomain: "cloudflare.com", city: "San Francisco", latitude: 37.8, longitude: -122.4, country: "US");
+
+			var geo = await Geo(host);
+
+			Assert.Equal(("cdn", "Cloudflare", "cloudflare.com", "ranges"), (geo.Text("precision"), geo.Text("cdn"), geo.Text("cdn_domain"), geo.Text("cdn_source")));
+			Assert.Null(geo["latitude"]);
+			Assert.Equal((WeeksAgo(2), "Hamburg", "DE"), (geo["before_cdn"].Text("week"), geo["before_cdn"].Text("city"), geo["before_cdn"].Text("country")));
+			Assert.Equal(53.6, geo["before_cdn"]!["latitude"]!.GetValue<double>());
+		}
+
+		[Fact]
+		public async Task A_server_history_is_weekly_newest_first_and_a_cdn_hides_its_place()
+		{
+			var host = await Instance(3, Milan(), "historic");
+			await Snapshot(host, 2, city: "Milan", latitude: 45.5, longitude: 9.2, country: "IT");
+			await Snapshot(host, 1, cdn: "Fastly", cdnDomain: "fastly.com", city: "Frankfurt", latitude: 50.1, longitude: 8.7, country: "DE");
+
+			var weeks = (await _host.Client().Get($"/api/privapub/v1/instances/{host}/history")).Ok().Body!.AsArray();
+
+			Assert.Equal(new[] { WeeksAgo(1), WeeksAgo(2) }, weeks.Select(w => w.Text("week")));
+			Assert.Equal(("cdn", "fastly.com"), (weeks[0]!["geo"].Text("precision"), weeks[0]!["geo"].Text("cdn_domain")));
+			Assert.Null(weeks[0]!["geo"]!["city"]);
+			Assert.Equal(("city", "Milan"), (weeks[1]!["geo"].Text("precision"), weeks[1]!["geo"].Text("city")));
+			Assert.Equal(3, weeks[1]!["users_total"]!.GetValue<long>());
+			Assert.Single((await _host.Client().Get($"/api/privapub/v1/instances/{host}/history?weeks=1")).Ok().Body!.AsArray());
+			Assert.Equal(HttpStatusCode.NotFound, (await _host.Client().Get($"/api/privapub/v1/instances/unknown{Guid.NewGuid():N}.example/history")).Status);
+		}
+
+		[Fact]
+		public async Task Servers_are_grouped_by_their_cdn_week_by_week()
+		{
+			var cdn = $"Edge{Guid.NewGuid():N}"[..20];
+			var key = cdn.ToLowerInvariant();
+			var stayed = await Instance(3, new InstanceGeo { Country = "FR", Cdn = cdn, CdnSource = "headers" }, "stayed");
+			var moved = await Instance(3, Milan(), "moved");
+			await Snapshot(moved, 3, cdn: cdn);
+			await Snapshot(moved, 2, cdn: cdn);
+			await Snapshot(stayed, 2, cdn: cdn);
+			await Snapshot(moved, 1, city: "Milan", latitude: 45.5, longitude: 9.2, country: "IT");
+			await Snapshot(stayed, 1, cdn: cdn);
+
+			var list = (await _host.Client().Get("/api/privapub/v1/cdns")).Ok().Body!.AsArray();
+			var group = list.Single(g => g.Text("key") == key);
+			Assert.Equal((cdn, 1), (group.Text("name"), group["servers"]!.GetValue<int>()));
+			var cloudflare = list.Single(g => g.Text("key") == "cloudflare.com");
+			Assert.Equal(new[] { "ranges", "headers", "asn" }, cloudflare["detected_by"]!.AsArray().Select(v => v!.GetValue<string>()));
+
+			var detail = (await _host.Client().Get($"/api/privapub/v1/cdns/{key}")).Ok().Body;
+			Assert.Equal(new[] { stayed }, detail["hosts"]!.AsArray().Select(h => h!.GetValue<string>()));
+			var weeks = detail["weeks"]!.AsArray();
+			Assert.Equal(new[] { WeeksAgo(1), WeeksAgo(2), WeeksAgo(3) }, weeks.Select(w => w.Text("week")));
+			Assert.Equal(new[] { 1, 2, 1 }, weeks.Select(w => w!["servers"]!.GetValue<int>()));
+			Assert.Equal(new[] { moved }, weeks[0]!["left"]!.AsArray().Select(h => h!.GetValue<string>()));
+			Assert.Equal(new[] { stayed }, weeks[1]!["joined"]!.AsArray().Select(h => h!.GetValue<string>()));
+			Assert.Equal(new[] { moved }, weeks[2]!["joined"]!.AsArray().Select(h => h!.GetValue<string>()));
+
+			Assert.Equal("Cloudflare", (await _host.Client().Get("/api/privapub/v1/cdns/cloudflare.com")).Ok().Body.Text("name"));
+			Assert.Equal(HttpStatusCode.NotFound, (await _host.Client().Get($"/api/privapub/v1/cdns/none{Guid.NewGuid():N}")).Status);
+		}
+
+		[Fact]
+		public async Task Junk_hosts_are_not_an_error()
+		{
+			Assert.Equal(HttpStatusCode.NotFound, (await _host.Client().Get($"/api/privapub/v1/instances/{new string('a', 300)}")).Status);
+			Assert.Empty((await _host.Client().Get($"/api/privapub/v1/instances?host[]=&host[]={new string('a', 300)}")).Ok().Body!.AsArray());
+		}
+	}
+
+	public sealed class SelfPlacedHost : PrivaPubHost
+	{
+		static readonly SemaphoreSlim Boot = new(1, 1);
+		static SelfPlacedHost _shared;
+
+		public static new async Task<SelfPlacedHost> Shared()
+		{
+			await PrivaPubHost.Shared();
+			await Boot.WaitAsync();
+			try
+			{
+				if (_shared == default)
+				{
+					var host = new SelfPlacedHost();
+					_ = host.Services;
+					_shared = host;
+				}
+				return _shared;
+			}
+			finally
+			{
+				Boot.Release();
+			}
+		}
+
+		protected override IEnumerable<KeyValuePair<string, string>> Settings() => base.Settings().Concat(new Dictionary<string, string>
+		{
+			["Statistics:Geo:Self:Latitude"] = "45.4642",
+			["Statistics:Geo:Self:Longitude"] = "9.19",
+			["Statistics:Geo:Self:City"] = "Milan",
+			["Statistics:Geo:Self:Country"] = "IT"
+		});
+	}
+}

PrivaPub.Tests/Http/MastodonInstanceTests.cs

@@ -28,7 +28,8 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal("4.2.0 (compatible; PrivaPub)", v1.Body.Text("version"));
 			Assert.Equal(InstanceController.Version, v1.Body.Text("version"));
 			Assert.Equal(PrivaPubHost.Host, v1.Body.Text("uri"));
-			Assert.False(v1.Body.Flag("registrations"));
+			Assert.True(v1.Body.Flag("registrations"));
+			Assert.True(v1.Body.Flag("invites_enabled"));
 			Assert.True(v1.Body["stats"].Number("user_count") >= 0);
 			Assert.Equal(5000, v1.Body["configuration"]!["statuses"].Number("max_characters"));
 			Assert.Equal(4, v1.Body["configuration"]!["polls"].Number("max_options"));
@@ -40,8 +41,11 @@ namespace PrivaPub.Tests.Http
 			var v2 = (await anonymous.Get("/api/v2/instance")).Ok();
 			Assert.Equal(InstanceController.Version, v2.Body.Text("version"));
 			Assert.Equal(PrivaPubHost.Host, v2.Body.Text("domain"));
-			Assert.Equal($"wss://{PrivaPubHost.Host}", v2.Body["configuration"]!["urls"].Text("streaming"));
+			Assert.Null(v2.Body["configuration"]!["urls"]!["streaming"]);//nothing streams yet, so nothing is advertised
-			Assert.False(v2.Body["registrations"].Flag("enabled"));
+			Assert.Equal(PrivaPub.Api.Mastodon.Controllers.StatusesController.MaxPins, v2.Body["configuration"]!["accounts"].Number("max_pinned_statuses"));
+			Assert.Contains("image/avif", v2.Body["configuration"]!["media_attachments"]!["supported_mime_types"]!.AsArray().Select(t => t!.GetValue<string>()));
+			Assert.True(v2.Body["registrations"].Flag("enabled"));
+			Assert.True((await anonymous.Get("/nodeinfo/2.1")).Ok().Body.Flag("openRegistrations"));
 			Assert.False(v2.Body["configuration"]!["translation"].Flag("enabled"));
 			Assert.Equal(7, v2.Body["api_versions"].Number("mastodon"));
 

PrivaPub.Tests/Http/MastodonStatusesTests.cs

@@ -60,7 +60,8 @@ namespace PrivaPub.Tests.Http
 			Assert.Equal(new[] { MastodonHelpers.Public }, Strings(unlistedNote["cc"]));
 			var quietNote = creates[quiet.Text("uri")]["object"];
 			Assert.Equal(new[] { followers }, Strings(quietNote["to"]));
-			Assert.Empty(quietNote["cc"]!.AsArray());
+			// named again in cc: Pleroma and Akkoma read an empty cc without a "/followers" address as a direct message
+			Assert.Equal(new[] { followers }, Strings(quietNote["cc"]));
 			var whisper = Assert.Single(await carol.Delivered(since));
 			Assert.Equal(direct.Text("uri"), whisper["object"].Text("id"));
 			Assert.Equal(new[] { carol.Id }, Strings(whisper["object"]!["to"]));

PrivaPub.Tests/Http/OneAnswerTests.cs

@@ -0,0 +1,263 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.Post;
+using PrivaPub.Models.Social;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Net;
+using System.Text.Json.Nodes;
+
+using static PrivaPub.Tests.Support.Host.FederationHelpers;
+
+using PostEntity = PrivaPub.Models.Post.Post;
+
+namespace PrivaPub.Tests.Http
+{
+	// Two views of the same fact give one answer (owner decision 2026-10-04: fix the mismatches).
+	[Trait("Category", "Integration")]
+	public sealed class OneAnswerTests : IAsyncLifetime
+	{
+		PrivaPubHost _host;
+		HttpClient _client;
+		Peer _peer;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_host = await PrivaPubHost.Shared();
+			_client = _host.Client();
+			_peer = await Peer.Start();
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			_client?.Dispose();
+			if (_peer != default)
+				await _peer.DisposeAsync();
+		}
+
+		[Fact]
+		public async Task Anyone_may_search_and_only_a_signed_in_reader_resolves_or_pages()
+		{
+			var reader = await _host.Mastodon("searcher");
+
+			Assert.Equal(HttpStatusCode.OK, (await _client.Get("/api/v2/search?q=somebody")).Status);
+			Assert.Equal(HttpStatusCode.Unauthorized, (await _client.Get("/api/v2/search?q=somebody&resolve=true")).Status);
+			Assert.Equal(HttpStatusCode.Unauthorized, (await _client.Get("/api/v2/search?q=somebody&offset=5")).Status);
+			Assert.Equal(HttpStatusCode.OK, (await reader.Client.Get("/api/v2/search?q=somebody&offset=5")).Status);
+		}
+
+		[Fact]
+		public async Task A_remote_account_that_deletes_itself_leaves_nothing_in_the_counts()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var author = await _host.Mastodon("liked");
+			var post = await author.Status("like me");
+			var fan = new RemoteActor(_peer, "fickle");
+			var like = new JsonObject
+			{
+				["id"] = $"{fan.Id}#likes/{Guid.NewGuid():N}",
+				["type"] = "Like",
+				["actor"] = fan.Id,
+				["object"] = post.Text("uri")
+			};
+			Assert.Equal(HttpStatusCode.Accepted, (await _client.SendAsync(fan.SignedPost("/human-centipede", like), token)).StatusCode);
+			await _host.RunInbox(like["id"]!.GetValue<string>(), token);
+			Assert.Equal(1, (await author.Client.Get($"/api/v1/statuses/{post.Text("id")}")).Ok().Body.Number("favourites_count"));
+
+			var delete = new JsonObject
+			{
+				["id"] = $"{fan.Id}#delete",
+				["type"] = "Delete",
+				["actor"] = fan.Id,
+				["object"] = fan.Id,
+				["to"] = new JsonArray("https://www.w3.org/ns/activitystreams#Public")
+			};
+			Assert.Equal(HttpStatusCode.Accepted, (await _client.SendAsync(fan.SignedPost("/human-centipede", delete), token)).StatusCode);
+			await _host.RunInbox(delete["id"]!.GetValue<string>(), token);
+
+			Assert.Equal(0, (await author.Client.Get($"/api/v1/statuses/{post.Text("id")}")).Ok().Body.Number("favourites_count"));
+			Assert.Empty((await author.Client.Get($"/api/v1/statuses/{post.Text("id")}/favourited_by")).Ok().Array);
+			Assert.False(await DB.Default.Find<Favourite>().Match(f => f.ActorURI == fan.Id).ExecuteAnyAsync(token));
+			Assert.False(await DB.Default.Find<Notification>().Match(n => n.FromActorURI == fan.Id).ExecuteAnyAsync(token));
+			Assert.Equal(0, (await author.Client.Get("/api/v1/notifications/unread_count")).Ok().Body.Number("count"));
+		}
+
+		[Fact]
+		public async Task Only_public_and_unlisted_replies_are_counted()
+		{
+			var author = await _host.Mastodon("threadstart");
+			var replier = await _host.Mastodon("replier");
+			var root = await author.Status("say something");
+			var id = root.Text("id");
+
+			await replier.Status("in public", ("in_reply_to_id", id));
+			await replier.Status("quietly", ("in_reply_to_id", id), ("visibility", "unlisted"));
+			await replier.Status("for my followers", ("in_reply_to_id", id), ("visibility", "private"));
+			await replier.Status($"@{author.UserName} just you", ("in_reply_to_id", id), ("visibility", "direct"));
+
+			Assert.Equal(2, (await author.Client.Get($"/api/v1/statuses/{id}")).Ok().Body.Number("replies_count"));
+		}
+
+		[Fact]
+		public async Task A_status_longer_than_advertised_is_refused()
+		{
+			var author = await _host.Mastodon("wordy");
+			var limit = (await _client.Get("/api/v2/instance")).Ok().Body["configuration"]!["statuses"].Number("max_characters");
+
+			var refused = await author.Client.Post("/api/v1/statuses", ("status", new string('a', limit + 1)));
+			var accepted = await author.Client.Post("/api/v1/statuses", ("status", new string('a', limit)));
+
+			Assert.Equal(HttpStatusCode.UnprocessableEntity, refused.Status);
+			Assert.Equal(HttpStatusCode.OK, accepted.Status);
+		}
+
+		[Fact]
+		public async Task Joining_a_community_by_invitation_is_following_it()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var owner = await _host.Persona(await _host.SignUp(), "commowner");
+			var joinerRoot = await _host.SignUp("joiner");
+			var joiner = await _host.Persona(joinerRoot, "joiner");
+			var group = await _host.Group(owner, community: true);
+			var groupName = group["userName"]!.GetValue<string>();
+			using var client = _host.As(joinerRoot.Jwt);
+
+			var joined = await client.PostJson("/clientapi/group/join", new { avatarId = joiner.Id, invitationCode = group["invitationCode"]!.GetValue<string>() });
+
+			Assert.Equal(HttpStatusCode.OK, joined.StatusCode);
+			Assert.Equal(1, (await _client.Fetch($"/peasants/{groupName}/groupies")).Json["totalItems"]!.GetValue<int>());
+			Assert.True(await DB.Default.Find<Following>().Match(f => f.AvatarId == joiner.Id && f.State == FollowState.Accepted).ExecuteAnyAsync(token));
+		}
+
+		public static TheoryData<string> AnsweredRoutes() => new()
+		{
+			"/api/v1/directory",
+			"/api/v1/tags/cats",
+			"/api/v1/instance/languages",
+			"/api/v1/instance/translation_languages",
+			"/api/v1/instance/domain_blocks",
+			"/api/v1/instance/privacy_policy",
+			"/api/v1/timelines/link?url=https%3A%2F%2Fexample.org%2F",
+			"/api/v1/accounts/000000000000000000000000/identity_proofs"
+		};
+
+		[Theory]
+		[MemberData(nameof(AnsweredRoutes))]
+		public async Task Mastodon_routes_we_have_nothing_behind_answer_instead_of_404(string path)
+		{
+			Assert.Equal(HttpStatusCode.OK, (await _client.Get(path)).Status);
+		}
+
+		[Fact]
+		public async Task Likes_of_one_post_come_as_one_group_of_notifications()
+		{
+			var author = await _host.Mastodon("grouped");
+			var first = await _host.Mastodon("fanone");
+			var second = await _host.Mastodon("fantwo");
+			var post = await author.Status("like me twice");
+			var id = post.Text("id");
+			await first.Client.Post($"/api/v1/statuses/{id}/favourite");
+			await second.Client.Post($"/api/v1/statuses/{id}/favourite");
+
+			var list = (await author.Client.Get("/api/v2/notifications")).Ok().Body;
+			var group = Assert.Single(list["notification_groups"]!.AsArray(), g => g!.Text("type") == "favourite")!;
+			var key = group.Text("group_key");
+
+			Assert.Equal($"grouped-favourite-{id}", key);
+			Assert.Equal(2, group.Number("notifications_count"));
+			Assert.Equal(2, group["sample_account_ids"]!.AsArray().Count);
+			Assert.Equal(id, group.Text("status_id"));
+			Assert.Contains(list["statuses"]!.AsArray(), s => s!.Text("id") == id);
+			Assert.True((await author.Client.Get("/api/v2/notifications/unread_count")).Ok().Body.Number("count") >= 1);
+			Assert.Equal(key, Assert.Single((await author.Client.Get($"/api/v2/notifications/{key}")).Ok().Body["notification_groups"]!.AsArray())!.Text("group_key"));
+			Assert.Equal(2, (await author.Client.Get($"/api/v2/notifications/{key}/accounts")).Ok().Array.Count);
+			Assert.Equal(HttpStatusCode.OK, (await author.Client.Post($"/api/v2/notifications/{key}/dismiss")).Status);
+			Assert.Equal(HttpStatusCode.NotFound, (await author.Client.Get($"/api/v2/notifications/{key}")).Status);
+		}
+
+		[Fact]
+		public async Task A_hashtag_link_opens_a_page_of_public_posts_with_that_tag()
+		{
+			var author = await _host.Mastodon("tagger");
+			var tag = $"tag{Guid.NewGuid():N}"[..16];
+			await author.Status($"about #{tag}");
+			await author.Status($"quietly about #{tag}", ("visibility", "private"));
+
+			var page = await _client.Fetch($"/tags/{tag}", Browser);
+
+			Assert.Equal(HttpStatusCode.OK, page.Status);
+			Assert.Contains("about", page.Text);
+			Assert.DoesNotContain("quietly", page.Text);
+			Assert.Contains("default-src 'none'", page.Response.Headers.GetValues("Content-Security-Policy").Single());
+		}
+
+		[Fact]
+		public async Task A_communitys_announces_resolve_while_the_post_is_shown()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var owner = await _host.Persona(await _host.SignUp(), "announcer");
+			var community = await _host.FederatedGroup(owner, community: true);
+			var post = await _host.Publish(owner, new PrivaPub.Domain.Statuses.StatusDraft { Text = "into the community", PlainText = true, GroupId = community.Id });
+			var kept = await DB.Default.Find<GroupAnnouncement>().Match(a => a.GroupId == community.Id && a.ObjectURI == post.ObjectURI).ExecuteAsync(token);
+			Assert.Equal(2, kept.Count);//the activity, and the object for Mastodon
+
+			foreach (var announcement in kept)
+			{
+				var fetched = await _client.Fetch(PathOf(announcement.ActivityURI));
+				Assert.Equal(HttpStatusCode.OK, fetched.Status);
+				Assert.Equal("Announce", fetched.Json["type"]!.GetValue<string>());
+				Assert.Equal(announcement.ActivityURI, fetched.Json["id"]!.GetValue<string>());
+			}
+			var listed = await _client.Fetch($"/peasants/{community.UserName}/grunts/announce-{post.ID}");
+			Assert.Equal(HttpStatusCode.OK, listed.Status);
+
+			await _host.Remove(owner, post);
+			Assert.Equal(HttpStatusCode.Gone, (await _client.Fetch(PathOf(kept[0].ActivityURI))).Status);
+		}
+
+		[Fact]
+		public async Task A_boost_points_at_the_boosted_posts_page()
+		{
+			var author = await _host.Mastodon("boosted");
+			var booster = await _host.Mastodon("booster");
+			var post = await author.Status("boost me");
+
+			var boost = (await booster.Client.Post($"/api/v1/statuses/{post.Text("id")}/reblog")).Ok().Body;
+
+			Assert.Equal(post.Text("url"), boost.Text("url"));
+			var browser = await _client.Fetch(PathOf(boost.Text("uri")), Browser);
+			Assert.Equal(HttpStatusCode.Redirect, browser.Status);
+		}
+
+		[Fact]
+		public async Task A_remote_accounts_counts_are_what_its_server_publishes()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var reader = await _host.Mastodon("counter");
+			var popular = new RemoteActor(_peer, "popular");
+			_peer.Serve(new Uri(popular.Id).AbsolutePath + "/followers",
+				$$"""{"@context":"https://www.w3.org/ns/activitystreams","id":"{{popular.Id}}/followers","type":"OrderedCollection","totalItems":42}""");
+			var remote = _host.Get<PrivaPub.Federation.Actors.IRemoteActorService>();
+			var account = await remote.GetActor(popular.Id, refresh: true, token);
+
+			await _host.Run(j => j.Kind == PrivaPub.Models.Jobs.JobKind.CountAccount && j.Payload == popular.Id, token);
+
+			var shown = (await reader.Client.Get($"/api/v1/accounts/{account.ID}")).Ok().Body;
+			Assert.Equal(42, shown.Number("followers_count"));
+			Assert.Equal(0, shown.Number("following_count"));
+		}
+
+		[Fact]
+		public async Task Notification_policy_and_requests_answer_a_signed_in_reader()
+		{
+			var reader = await _host.Mastodon("policy");
+
+			Assert.Equal(HttpStatusCode.OK, (await reader.Client.Get("/api/v1/notifications/policy")).Status);
+			Assert.Equal("accept", (await reader.Client.Get("/api/v2/notifications/policy")).Ok().Body.Text("for_not_following"));
+			Assert.Empty((await reader.Client.Get("/api/v1/notifications/requests")).Ok().Array);
+		}
+	}
+}

PrivaPub.Tests/Http/PersonaExchangeTests.cs

@@ -0,0 +1,218 @@
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.IdentityModel.JsonWebTokens;
+using Microsoft.IdentityModel.Tokens;
+
+using PrivaPub.Api.Mastodon.Auth;
+using PrivaPub.Services;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Net;
+using System.Security.Claims;
+using System.Text;
+
+namespace PrivaPub.Tests.Http
+{
+	// The first-party client's one sign-in: the /clientapi JWT exchanged for one persona's Mastodon token (PersonaExchange).
+	[Trait("Category", "Integration")]
+	public sealed class PersonaExchangeTests : IAsyncLifetime
+	{
+		const string Grant = "urn:ietf:params:oauth:grant-type:token-exchange";
+		const string FirstParty = "decepub";
+
+		PrivaPubHost _host;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_host = await PrivaPubHost.Shared();
+		}
+
+		public ValueTask DisposeAsync() => ValueTask.CompletedTask;
+
+		async Task<HttpResponseMessage> Exchange(string jwt, string avatarId, string clientId = FirstParty, string clientSecret = default,
+			string subjectTokenType = PersonaExchange.SubjectTokenType)
+		{
+			var fields = new List<(string, string)>
+			{
+				("grant_type", Grant),
+				("client_id", clientId),
+				("subject_token", jwt),
+				("subject_token_type", subjectTokenType),
+				(PersonaExchange.AvatarParameter, avatarId),
+				("scope", "read write follow")
+			};
+			if (clientSecret != default)
+				fields.Add(("client_secret", clientSecret));
+			using var client = _host.Client();
+			return await client.Form("/oauth/token", fields.Where(f => f.Item2 != default).ToArray());
+		}
+
+		async Task<string> Token(Persona persona)
+		{
+			var response = await Exchange(persona.Root.Jwt, persona.Id);
+			Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+			return (await response.JsonBody())["access_token"]!.GetValue<string>();
+		}
+
+		static async Task AssertRefused(HttpResponseMessage response, string error = "invalid_grant")
+		{
+			Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+			Assert.Equal(error, (await response.JsonBody())["error"]?.GetValue<string>());
+		}
+
+		async Task<HttpStatusCode> Me(string token)
+		{
+			using var api = _host.As(token);
+			return (await api.GetAsync("/api/v1/accounts/verify_credentials", TestContext.Current.CancellationToken)).StatusCode;
+		}
+
+		static string Jwt(string rootId, string key, DateTime expires) => new JsonWebTokenHandler().CreateToken(new SecurityTokenDescriptor
+		{
+			Issuer = PrivaPubHost.Base,
+			Audience = PrivaPubHost.Base,
+			Subject = new ClaimsIdentity(new[] { new Claim(ClaimTypes.UserData, rootId) }),
+			NotBefore = expires.AddHours(-2),
+			IssuedAt = expires.AddHours(-2),
+			Expires = expires,
+			SigningCredentials = new(new SymmetricSecurityKey(Encoding.UTF8.GetBytes(key)), SecurityAlgorithms.HmacSha512)
+		});
+
+		[Fact]
+		public async Task The_root_jwt_becomes_one_personas_token_that_never_names_the_root()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "exchange");
+			var root = persona.Root;
+
+			var response = await Exchange(root.Jwt, persona.Id);
+			var body = await response.Content.ReadAsStringAsync(TestContext.Current.CancellationToken);
+
+			Assert.Equal(HttpStatusCode.OK, response.StatusCode);
+			Assert.DoesNotContain(root.Id, body);
+			Assert.DoesNotContain(root.UserName, body);
+			var token = (await response.JsonBody())["access_token"]!.GetValue<string>();
+			using var api = _host.As(token);
+			var account = await api.GetStringAsync("/api/v1/accounts/verify_credentials", TestContext.Current.CancellationToken);
+			Assert.Contains($"\"id\":\"{persona.Id}\"", account);
+			Assert.DoesNotContain(root.Id, account);
+			foreach (var entry in await ClientApi.StoredTokens(FirstParty))
+			{
+				var payload = entry.Contains("payload") && entry["payload"].IsString ? ClientApi.JwtPayload(entry["payload"].AsString) : string.Empty;
+				Assert.DoesNotContain(root.Id, entry.ToString() + payload);
+				Assert.DoesNotContain(root.UserName, entry.ToString() + payload);
+			}
+		}
+
+		[Fact]
+		public async Task Each_persona_of_the_root_gets_its_own_token()
+		{
+			var root = await _host.SignUp();
+			var first = await _host.Persona(root, "first");
+			var second = await _host.Persona(root, "second");
+
+			using var firstApi = _host.As(await Token(first));
+			using var secondApi = _host.As(await Token(second));
+
+			Assert.Contains($"\"id\":\"{first.Id}\"", await firstApi.GetStringAsync("/api/v1/accounts/verify_credentials", TestContext.Current.CancellationToken));
+			Assert.Contains($"\"id\":\"{second.Id}\"", await secondApi.GetStringAsync("/api/v1/accounts/verify_credentials", TestContext.Current.CancellationToken));
+		}
+
+		[Fact]
+		public async Task Another_roots_persona_is_refused()
+		{
+			var mine = await _host.SignUp();
+			var theirs = await _host.Persona(await _host.SignUp(), "theirs");
+
+			await AssertRefused(await Exchange(mine.Jwt, theirs.Id));
+			await AssertRefused(await Exchange(mine.Jwt, "000000000000000000000000"));
+			await AssertRefused(await Exchange(mine.Jwt, "not an id"));
+		}
+
+		[Fact]
+		public async Task A_token_that_is_not_a_valid_root_jwt_is_refused()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "forged");
+			var key = _host.Services.GetRequiredService<IConfiguration>()["AppConfiguration:Jwt:Key"]!;
+
+			await AssertRefused(await Exchange("garbage", persona.Id));
+			await AssertRefused(await Exchange(Jwt(persona.Root.Id, key, DateTime.UtcNow.AddMinutes(-10)), persona.Id));
+			await AssertRefused(await Exchange(Jwt(persona.Root.Id, new string('k', 64), DateTime.UtcNow.AddHours(1)), persona.Id));
+		}
+
+		[Fact]
+		public async Task Ended_sessions_refuse_the_jwt_and_revoke_the_exchanged_tokens()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "ended");
+			var token = await Token(persona);
+			Assert.Equal(HttpStatusCode.OK, await Me(token));
+
+			using (var scope = _host.Services.CreateScope())
+				await scope.ServiceProvider.GetRequiredService<IRootSessions>().Revoke(persona.Root.Id, TestContext.Current.CancellationToken);
+
+			await AssertRefused(await Exchange(persona.Root.Jwt, persona.Id));
+			Assert.Equal(HttpStatusCode.Unauthorized, await Me(token));
+		}
+
+		[Fact]
+		public async Task A_banned_root_is_refused()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "banned");
+			await ClientApi.Ban(persona.Root.Id);
+			try
+			{
+				await AssertRefused(await Exchange(persona.Root.Jwt, persona.Id));
+			}
+			finally
+			{
+				await ClientApi.Ban(persona.Root.Id, banned: false);
+			}
+		}
+
+		[Fact]
+		public async Task A_revoked_token_no_longer_works()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "revoked");
+			var token = await Token(persona);
+
+			using var client = _host.Client();
+			var revoked = await client.Form("/oauth/revoke", ("token", token), ("client_id", FirstParty));
+
+			Assert.Equal(HttpStatusCode.OK, revoked.StatusCode);
+			Assert.Equal(HttpStatusCode.Unauthorized, await Me(token));
+		}
+
+		[Fact]
+		public async Task Only_the_first_party_client_may_exchange()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "thirdparty");
+			using var client = _host.Client();
+			var app = await client.RegisterApp();
+
+			var response = await Exchange(persona.Root.Jwt, persona.Id, app.ClientId, app.ClientSecret);
+
+			Assert.Equal(HttpStatusCode.BadRequest, response.StatusCode);
+			Assert.Equal("unauthorized_client", (await response.JsonBody())["error"]?.GetValue<string>());
+		}
+
+		[Fact]
+		public async Task A_mastodon_token_is_not_a_subject_token()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "mastodon");
+			var token = await Token(persona);
+
+			await AssertRefused(await Exchange(token, persona.Id, subjectTokenType: "urn:ietf:params:oauth:token-type:access_token"), "invalid_request");
+			await AssertRefused(await Exchange(token, persona.Id));
+		}
+
+		[Fact]
+		public async Task Missing_parameters_are_a_client_error()
+		{
+			var persona = await _host.Persona(await _host.SignUp(), "missing");
+
+			await AssertRefused(await Exchange(persona.Root.Jwt, default));
+			await AssertRefused(await Exchange(default, persona.Id), "invalid_request");
+			await AssertRefused(await Exchange(persona.Root.Jwt, persona.Id, subjectTokenType: default), "invalid_request");
+		}
+	}
+}

PrivaPub.Tests/Http/PostPlaceTests.cs

@@ -0,0 +1,106 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.Post;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Text.Json.Nodes;
+
+namespace PrivaPub.Tests.Http
+{
+	// A Pixelfed post's own place: stored from `location`, shown as `privapub.place`, changed by an edit.
+	[Trait("Category", "Integration")]
+	public sealed class PostPlaceTests : IAsyncLifetime
+	{
+		PrivaPubHost _host;
+		Peer _peer;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_host = await PrivaPubHost.Shared();
+			_peer = await Peer.Start();
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			if (_peer != default)
+				await _peer.DisposeAsync();
+		}
+
+		static CancellationToken Token => TestContext.Current.CancellationToken;
+
+		static JsonObject Location(string name, string latitude, string longitude) => new()
+		{
+			["type"] = "Place", ["name"] = name, ["latitude"] = latitude, ["longitude"] = longitude, ["country"] = "Italy"
+		};
+
+		[Fact]
+		public async Task A_pixelfed_place_is_shown_and_follows_the_authors_edits()
+		{
+			var alice = await _host.Mastodon("alice");
+			var ann = new RemoteActor(_peer, "ann");
+			var post = await _host.PublicPostFrom(ann, alice, "<p>the duomo</p>", note => note["location"] = Location("Milan", "45.4642", "9.19"));
+
+			var place = (await alice.Client.Get($"/api/v1/statuses/{post.ID}")).Ok().Body["privapub"]!["place"];
+
+			Assert.Equal(("Milan", "Italy"), (place.Text("name"), place.Text("country")));
+			Assert.Equal(45.4642, place["latitude"]!.GetValue<double>());
+			Assert.Equal(9.19, place["longitude"]!.GetValue<double>());
+
+			await Edit(ann, alice, post, note => note["location"] = Location("Turin", "45.0703", "7.6869"));
+			Assert.Equal("Turin", (await alice.Client.Get($"/api/v1/statuses/{post.ID}")).Ok().Body["privapub"]!["place"].Text("name"));
+
+			await Edit(ann, alice, post, _ => { });
+			Assert.Null((await alice.Client.Get($"/api/v1/statuses/{post.ID}")).Ok().Body["privapub"]!["place"]);
+			Assert.Null((await DB.Default.Find<Post>().MatchID(post.ID).ExecuteFirstAsync(Token)).Place);
+		}
+
+		[Fact]
+		public async Task A_post_without_a_place_has_none()
+		{
+			var alice = await _host.Mastodon("alice");
+			var post = await _host.PublicPostFrom(new RemoteActor(_peer, "plain"), alice);
+
+			Assert.Null((await alice.Client.Get($"/api/v1/statuses/{post.ID}")).Ok().Body["privapub"]!["place"]);
+		}
+
+		[Fact]
+		public async Task A_local_post_never_carries_a_location()
+		{
+			var alice = await _host.Mastodon("alice");
+			var status = await alice.Status("made here");
+
+			using var client = _host.Client();
+			client.DefaultRequestHeaders.Accept.ParseAdd("application/activity+json");
+			var note = JsonNode.Parse(await client.GetStringAsync(status.Text("uri"), Token))!;
+
+			Assert.Null(note["location"]);
+		}
+
+		async Task Edit(RemoteActor author, Mastodon mentioned, Post post, Action<JsonObject> shape)
+		{
+			var note = new JsonObject
+			{
+				["id"] = post.ObjectURI,
+				["type"] = "Note",
+				["attributedTo"] = author.Id,
+				["to"] = new JsonArray(MastodonHelpers.Public),
+				["cc"] = new JsonArray(mentioned.Uri),
+				["content"] = "<p>the duomo, again</p>",
+				["published"] = post.CreationDate.ToString("O"),
+				["updated"] = DateTime.UtcNow.ToString("O"),
+				["tag"] = new JsonArray(new JsonObject { ["type"] = "Mention", ["href"] = mentioned.Uri, ["name"] = "@" + mentioned.UserName })
+			};
+			shape(note);
+			await _host.Deliver(author, mentioned.Mouth, new JsonObject
+			{
+				["id"] = $"{post.ObjectURI}/updates/{Guid.NewGuid():N}",
+				["type"] = "Update",
+				["actor"] = author.Id,
+				["to"] = new JsonArray(MastodonHelpers.Public),
+				["object"] = note
+			});
+		}
+	}
+}

PrivaPub.Tests/Http/RegistrationsTests.cs

@@ -0,0 +1,50 @@
+using Microsoft.AspNetCore.Hosting;
+using Microsoft.AspNetCore.Mvc.Testing;
+
+using PrivaPub.Infrastructure;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Net;
+
+namespace PrivaPub.Tests.Http
+{
+	[Trait("Category", "Integration")]
+	public sealed class RegistrationsTests : IAsyncLifetime
+	{
+		WebApplicationFactory<Program> _closed;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			var shared = await PrivaPubHost.Shared();
+			_closed = shared.WithWebHostBuilder(builder => builder.UseSetting("Registrations:Mode", nameof(RegistrationMode.Invitations)));
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			if (_closed != default)
+				await _closed.DisposeAsync();
+		}
+
+		[Fact]
+		public async Task Invitations_only_refuses_sign_up_and_every_document_says_closed()
+		{
+			using var client = _closed.CreateClient(new WebApplicationFactoryClientOptions { BaseAddress = new Uri(PrivaPubHost.Base + "/"), AllowAutoRedirect = false });
+			client.DefaultRequestHeaders.Add(PrivaPubHost.ClientHeader, $"10.9.{Random.Shared.Next(256)}.{Random.Shared.Next(1, 255)}");
+
+			var signUp = await client.PostJson("/clientapi/user/signup", new { userName = $"closed{Guid.NewGuid():N}"[..20], password = "Closed-Door-Pass-1" });
+			var nodeInfo = (await client.Get("/nodeinfo/2.1")).Ok().Body;
+			var v1 = (await client.Get("/api/v1/instance")).Ok().Body;
+			var v2 = (await client.Get("/api/v2/instance")).Ok().Body;
+
+			Assert.Equal(HttpStatusCode.Forbidden, signUp.StatusCode);
+			Assert.Contains("invitation", await signUp.Content.ReadAsStringAsync(TestContext.Current.CancellationToken));
+			Assert.False(nodeInfo.Flag("openRegistrations"));
+			Assert.False(v1.Flag("registrations"));
+			Assert.True(v1.Flag("invites_enabled"));
+			Assert.False(v2["registrations"].Flag("enabled"));
+			Assert.Equal(RegistrationOptions.ClosedMessage, v2["registrations"].Text("message"));
+		}
+	}
+}

PrivaPub.Tests/Http/RootRemovalTests.cs

@@ -0,0 +1,118 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.User;
+using PrivaPub.Tests.Support;
+using PrivaPub.Tests.Support.Host;
+
+using System.Net;
+using System.Net.Http.Json;
+
+using GroupEntity = PrivaPub.Models.Group.Group;
+using PostEntity = PrivaPub.Models.Post.Post;
+
+namespace PrivaPub.Tests.Http
+{
+	// Deleting a root deletes its personas and their groups everywhere (owner decision 2026-10-04).
+	[Trait("Category", "Integration")]
+	public sealed class RootRemovalTests : IAsyncLifetime
+	{
+		PrivaPubHost _host;
+		HttpClient _client;
+		Peer _peer;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_host = await PrivaPubHost.Shared();
+			_client = _host.Client();
+			_peer = await Peer.Start();
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			_client?.Dispose();
+			if (_peer != default)
+				await _peer.DisposeAsync();
+		}
+
+		async Task<HttpResponseMessage> AdminRemoves(params string[] rootIds)
+		{
+			var admin = await _host.Admin();
+			using var client = _host.As(admin.Jwt);
+			using var request = new HttpRequestMessage(HttpMethod.Delete, "/clientapi/admin/remove/users") { Content = JsonContent.Create(new { userIdList = rootIds }) };
+			return await client.SendAsync(request, TestContext.Current.CancellationToken);
+		}
+
+		[Fact]
+		public async Task A_removed_roots_personas_and_groups_are_deleted_everywhere_and_say_so()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var root = await _host.SignUp("leaving");
+			var persona = await _host.Persona(root, "leaving");
+			var follower = new RemoteActor(_peer, "fan");
+			var member = new RemoteActor(_peer, "member");
+			await DB.Default.SaveAsync(new Follower { LocalActorId = persona.Id, LocalActorKind = LocalActorKind.Person, ActorURI = follower.Id, InboxURL = follower.Id + "/inbox" }, token);
+			var group = await _host.Group(persona, community: true);
+			var groupId = group["id"]!.GetValue<string>();
+			await DB.Default.SaveAsync(new Follower { LocalActorId = groupId, LocalActorKind = LocalActorKind.Group, ActorURI = member.Id, InboxURL = member.Id + "/inbox" }, token);
+			var post = await _host.Publish(persona, "goodbye soon");
+			var apiToken = await _host.MastodonToken(persona);
+			var since = DateTime.UtcNow.AddSeconds(-1);
+
+			Assert.Equal(HttpStatusCode.OK, (await AdminRemoves(root.Id)).StatusCode);
+
+			var toFollower = Assert.Single(await Jobs.Deliveries(follower.Id + "/inbox", since, token), d => d["type"]!.GetValue<string>() == "Delete");
+			Assert.Equal(persona.ActorUri(), toFollower["object"]!.GetValue<string>());
+			Assert.Equal(persona.ActorUri(), toFollower["actor"]!.GetValue<string>());
+			var groupName = group["userName"]!.GetValue<string>();
+			Assert.Contains(await Jobs.Deliveries(member.Id + "/inbox", since, token),
+				d => d["type"]!.GetValue<string>() == "Delete" && d["object"]!.GetValue<string>() == $"{PrivaPubHost.Base}/peasants/{groupName}");
+			var gone = await _client.Fetch($"/peasants/{persona.UserName}");
+			Assert.Equal(HttpStatusCode.Gone, gone.Status);
+			Assert.Equal("Person", gone.Json["formerType"]!.GetValue<string>());
+			Assert.Equal(HttpStatusCode.Gone, (await _client.Fetch($"/peasants/{groupName}")).Status);
+			Assert.Equal(HttpStatusCode.Gone, (await _client.GetAsync($"/.well-known/webfinger?resource=acct:{persona.UserName}@{PrivaPubHost.Host}", token)).StatusCode);
+			var stored = await DB.Default.Find<PostEntity>().MatchID(post.ID).ExecuteFirstAsync(token);
+			Assert.NotNull(stored.DeletedAt);
+			Assert.Null(stored.ContentHtml);
+			Assert.NotNull((await DB.Default.Find<GroupEntity>().MatchID(groupId).ExecuteFirstAsync(token)).DeletionAt);
+			var removed = await DB.Default.Find<RootUser>().MatchID(root.Id).ExecuteFirstAsync(token);
+			Assert.Equal($"deleted-{root.Id}", removed.UserName);
+			Assert.Null(removed.HashedPassword);
+			using var app = _host.Client();
+			app.DefaultRequestHeaders.Authorization = new("Bearer", apiToken);
+			Assert.Equal(HttpStatusCode.Unauthorized, (await app.GetAsync("/api/v1/accounts/verify_credentials", token)).StatusCode);
+		}
+
+		[Fact]
+		public async Task A_second_removal_does_not_collide_with_the_first()
+		{
+			var first = await _host.SignUp("first");
+			var second = await _host.SignUp("second");
+
+			Assert.Equal(HttpStatusCode.OK, (await AdminRemoves(first.Id)).StatusCode);
+			Assert.Equal(HttpStatusCode.OK, (await AdminRemoves(second.Id)).StatusCode);
+
+			Assert.NotNull((await DB.Default.Find<RootUser>().MatchID(second.Id).ExecuteFirstAsync(TestContext.Current.CancellationToken)).DeletedAt);
+		}
+
+		[Fact]
+		public async Task A_root_deletes_itself_only_with_its_password()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var root = await _host.SignUp("self");
+			var persona = await _host.Persona(root, "self");
+			using var client = _host.As(root.Jwt);
+
+			var refused = await client.PostJson("/clientapi/user/delete", new { password = "Not-The-Password-1" });
+			Assert.Equal(HttpStatusCode.Forbidden, refused.StatusCode);
+			Assert.Null((await DB.Default.Find<Avatar>().MatchID(persona.Id).ExecuteFirstAsync(token)).DeletionAt);
+
+			var accepted = await client.PostJson("/clientapi/user/delete", new { password = root.Password });
+			Assert.Equal(HttpStatusCode.OK, accepted.StatusCode);
+			Assert.NotNull((await DB.Default.Find<Avatar>().MatchID(persona.Id).ExecuteFirstAsync(token)).DeletionAt);
+			Assert.Equal(HttpStatusCode.Unauthorized, (await client.GetAsync("/clientapi/user/sniff/again", token)).StatusCode);
+		}
+	}
+}

PrivaPub.Tests/Http/WellKnownTests.cs

@@ -179,8 +179,10 @@ namespace PrivaPub.Tests.Http
 			return (await client.Fetch("/nodeinfo/2.1", "application/json")).Json["usage"]!["localPosts"]!.GetValue<long>();
 		}
 
+		// localPosts is Mastodon's: the sum of statuses_count, every local post but DMs and deleted ones, boosts included,
+		// and circle and located posts too (owner decision 2026-10-04)
 		[Fact]
-		public async Task Local_posts_count_only_what_anyone_may_see()
+		public async Task Local_posts_count_as_mastodon_counts_statuses()
 		{
 			var persona = await _host.Persona(await _host.SignUp(), "usage");
 			var friend = await _host.Persona(await _host.SignUp(), "usagefriend");
@@ -197,10 +199,10 @@ namespace PrivaPub.Tests.Http
 			await _host.Reblog(friend, shown);
 			var circle = await _host.FederatedGroup(persona, community: false);
 			await _host.Publish(persona, new StatusDraft { Text = "circle only", PlainText = true, GroupId = circle.Id });
-			Assert.Equal(start + 2, await LocalPosts());
+			Assert.Equal(start + 6, await LocalPosts());//followers-only, located, the boost and the circle post; not the DM nor the copy
 
 			await _host.Remove(persona, shown);
-			Assert.Equal(start + 1, await LocalPosts());
+			Assert.Equal(start + 4, await LocalPosts());//the post and the boost of it
 		}
 	}
 }

PrivaPub.Tests/Infrastructure/AdminCommandsTests.cs

@@ -1,3 +1,5 @@
+using Microsoft.Extensions.DependencyInjection;
+
 using MongoDB.Entities;
 
 using PrivaPub.ClientModels;
@@ -37,8 +39,8 @@ namespace PrivaPub.Tests.Infrastructure
 		{
 			var root = await _host.SignUp("promote");
 
-			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName.ToUpperInvariant() }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName.ToUpperInvariant() }, _host.Services));
-			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }, _host.Services));
 
 			Assert.Equal(new[] { Policies.IsAdmin, Policies.IsModerator, Policies.IsUser }.Order(), await StoredPolicies(root));
 		}
@@ -47,10 +49,10 @@ namespace PrivaPub.Tests.Infrastructure
 		public async Task Demote_leaves_a_plain_user()
 		{
 			var root = await _host.SignUp("demote");
-			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }, _host.Services));
 
-			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }, _host.Services));
-			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }, _host.Services));
 
 			Assert.Equal(new[] { Policies.IsUser }, await StoredPolicies(root));
 		}
@@ -58,8 +60,8 @@ namespace PrivaPub.Tests.Infrastructure
 		[Fact]
 		public async Task An_unknown_root_exits_1()
 		{
-			Assert.Equal(1, await AdminCommands.Run(new[] { "promote", $"nobody{Guid.NewGuid():N}" }));
+			Assert.Equal(1, await AdminCommands.Run(new[] { "promote", $"nobody{Guid.NewGuid():N}" }, _host.Services));
-			Assert.Equal(1, await AdminCommands.Run(new[] { "demote", $"nobody{Guid.NewGuid():N}" }));
+			Assert.Equal(1, await AdminCommands.Run(new[] { "demote", $"nobody{Guid.NewGuid():N}" }, _host.Services));
 		}
 
 		public static TheoryData<string[]> Misuses() => new()
@@ -75,7 +77,7 @@ namespace PrivaPub.Tests.Infrastructure
 		[MemberData(nameof(Misuses))]
 		public async Task Misuse_exits_2(string[] args)
 		{
-			Assert.Equal(2, await AdminCommands.Run(args));
+			Assert.Equal(2, await AdminCommands.Run(args, _host.Services));
 		}
 
 		[Fact]
@@ -84,7 +86,7 @@ namespace PrivaPub.Tests.Infrastructure
 			var root = await _host.SignUp("policies");
 			Assert.Equal(HttpStatusCode.Forbidden, await AdminRoute(root));
 
-			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }, _host.Services));
 			Assert.Equal(HttpStatusCode.OK, await AdminRoute(root));
 			using (var client = _host.As(root.Jwt))
 			{
@@ -92,8 +94,54 @@ namespace PrivaPub.Tests.Infrastructure
 				Assert.Contains(Policies.IsAdmin, refreshed["policies"]!.AsArray().Select(p => p!.GetValue<string>()));
 			}
 
-			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "demote", root.UserName }, _host.Services));
 			Assert.Equal(HttpStatusCode.Forbidden, await AdminRoute(root));
 		}
+
+		async Task<HttpStatusCode> LogIn(string login, string password)
+		{
+			using var client = _host.Client();
+			return (await client.PostJson("/clientapi/user/login", new { userName = login, password })).StatusCode;
+		}
+
+		[Fact]
+		public async Task Create_root_makes_a_login_from_a_password_on_standard_input()
+		{
+			using var scope = _host.Services.CreateScope();
+			var login = $"made{Guid.NewGuid():N}"[..20];
+			var output = new StringWriter();
+
+			Assert.Equal(0, await AdminCommands.Run(new[] { "create-root", login, "--admin" }, scope.ServiceProvider, new StringReader("Typed-On-Stdin-1\n"), output));
+			Assert.Equal(1, await AdminCommands.Run(new[] { "create-root", login }, scope.ServiceProvider, new StringReader("Typed-On-Stdin-2\n"), new StringWriter()));
+			Assert.Equal(1, await AdminCommands.Run(new[] { "create-root", $"weak{Guid.NewGuid():N}"[..20] }, scope.ServiceProvider, new StringReader("short\n"), new StringWriter()));
+			Assert.Equal(2, await AdminCommands.Run(new[] { "create-root", login, "--root" }, scope.ServiceProvider, new StringReader("Typed-On-Stdin-3\n"), new StringWriter()));
+
+			Assert.Equal(HttpStatusCode.OK, await LogIn(login, "Typed-On-Stdin-1"));
+			var stored = await DB.Default.Find<RootUser>().Match(u => u.UserName == login).ExecuteFirstAsync(TestContext.Current.CancellationToken);
+			Assert.Contains(Policies.IsAdmin, stored.Policies);
+		}
+
+		[Fact]
+		public async Task Smoke_keeps_one_undiscoverable_persona_and_a_new_password_each_run()
+		{
+			using var scope = _host.Services.CreateScope();
+			var persona = $"smoke{Guid.NewGuid():N}"[..20];
+			var first = new StringWriter();
+			var second = new StringWriter();
+
+			Assert.Equal(0, await AdminCommands.Run(new[] { "smoke", persona }, scope.ServiceProvider, output: first));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "smoke", persona }, scope.ServiceProvider, output: second));
+
+			var (login, oldPassword) = (first.ToString().Trim().Split(' ')[0], first.ToString().Trim().Split(' ')[1]);
+			var newPassword = second.ToString().Trim().Split(' ')[1];
+			Assert.Equal(AdminCommands.SmokeLogin, login);
+			Assert.NotEqual(oldPassword, newPassword);
+			Assert.Equal(HttpStatusCode.OK, await LogIn(login, newPassword));
+			Assert.NotEqual(HttpStatusCode.OK, await LogIn(login, oldPassword));
+			var avatars = await DB.Default.Find<Avatar>().Match(a => a.UserName == persona).ExecuteAsync(TestContext.Current.CancellationToken);
+			var avatar = Assert.Single(avatars);
+			Assert.False(avatar.Settings.IsDiscoverable);
+			Assert.False(avatar.Settings.IsIndexable);
+		}
 	}
 }

PrivaPub.Tests/Infrastructure/CdnCatalogTests.cs

@@ -0,0 +1,111 @@
+using PrivaPub.Infrastructure.Geo;
+using PrivaPub.Infrastructure.Http;
+using PrivaPub.Models.Jobs;
+
+using System.Net;
+
+namespace PrivaPub.Tests.Infrastructure
+{
+	public class CdnCatalogTests
+	{
+		static HttpResponseMessage Response(params (string Name, string Value)[] headers)
+		{
+			var response = new HttpResponseMessage(HttpStatusCode.OK) { Content = new StringContent("{}") };
+			foreach (var (name, value) in headers)
+				response.Headers.TryAddWithoutValidation(name, value);
+			return response;
+		}
+
+		[Theory]
+		[InlineData("cf-ray", "8c1f0e2b4d5a1234-FRA", "cloudflare.com")]
+		[InlineData("server", "cloudflare", "cloudflare.com")]
+		[InlineData("x-amz-cf-id", "abc==", "cloudfront.net")]
+		[InlineData("via", "1.1 5a1b.cloudfront.net (CloudFront)", "cloudfront.net")]
+		[InlineData("x-served-by", "cache-fra-eddf8230045-FRA", "fastly.com")]
+		[InlineData("server", "BunnyCDN-DE1-1078", "bunny.net")]
+		[InlineData("akamai-grn", "0.1234", "akamai.com")]
+		[InlineData("x-azure-ref", "20261004T101010Z-abc", "azure.microsoft.com")]
+		[InlineData("x-vercel-id", "fra1::abc", "vercel.com")]
+		[InlineData("x-iinfo", "1-2-3", "imperva.com")]
+		public void A_cdn_is_recognised_by_its_fingerprint(string header, string value, string domain)
+		{
+			Assert.Equal(domain, CdnCatalog.FromResponse(Response((header, value)))?.Domain);
+		}
+
+		[Fact]
+		public void A_plain_server_has_no_cdn_and_an_unknown_cdn_names_itself()
+		{
+			Assert.Null(CdnCatalog.FromResponse(Response(("server", "nginx"), ("via", "1.1 varnish"))));
+			var named = CdnCatalog.FromResponse(Response(("x-cdn", "EdgeOne")));
+			Assert.Equal(("EdgeOne", null, "edgeone"), (named.Name, named.Domain, named.Key));
+			Assert.Null(CdnCatalog.FromResponse(Response(("x-cdn", "<script>"))));
+		}
+
+		[Fact]
+		public void Only_networks_that_carry_nothing_but_a_cdn_name_it()
+		{
+			Assert.Equal("Cloudflare", CdnCatalog.OfAsn(13335)?.Name);
+			Assert.Equal("Akamai", CdnCatalog.OfAsn(20940)?.Name);
+			Assert.Null(CdnCatalog.OfAsn(16509));//AWS: CloudFront only by its ranges or its headers
+			Assert.Null(CdnCatalog.OfAsn(60068));//DataPacket also rents servers
+		}
+
+		[Fact]
+		public void Every_published_list_format_is_read()
+		{
+			Assert.Equal(new[] { "173.245.48.0/20", "2400:cb00::/32" },
+				CdnCatalog.Parse(CdnListFormat.Lines, "173.245.48.0/20\n# comment\n\n2400:cb00::/32\n").Select(n => n.ToString()));
+			Assert.Equal(new[] { "89.187.188.227/32", "2400:52e0:1500::714:1/128" },
+				CdnCatalog.Parse(CdnListFormat.StringArray, """["89.187.188.227","2400:52e0:1500::714:1"]""").Select(n => n.ToString()));
+			Assert.Equal(new[] { "23.235.32.0/20", "2a04:4e40::/32" },
+				CdnCatalog.Parse(CdnListFormat.AddressesJson, """{"addresses":["23.235.32.0/20"],"ipv6_addresses":["2a04:4e40::/32"]}""").Select(n => n.ToString()));
+			Assert.Equal(new[] { "92.223.124.12/32", "2a03:90c0::/32" },
+				CdnCatalog.Parse(CdnListFormat.AddressesJson, """{"addresses":["92.223.124.12/32"],"addresses_v6":["2a03:90c0::/32"]}""").Select(n => n.ToString()));
+			Assert.Equal(new[] { "199.83.128.0/21", "2a02:e980::/29" },
+				CdnCatalog.Parse(CdnListFormat.ImpervaJson, """{"ipRanges":["199.83.128.0/21"],"ipv6Ranges":["2a02:e980::/29"],"res":0}""").Select(n => n.ToString()));
+			Assert.Equal(new[] { "13.32.0.0/15", "2600:9000::/28" },
+				CdnCatalog.Parse(CdnListFormat.AwsCloudFront, """
+					{"prefixes":[{"ip_prefix":"3.4.12.4/32","service":"AMAZON"},{"ip_prefix":"13.32.0.0/15","service":"CLOUDFRONT"}],
+					 "ipv6_prefixes":[{"ipv6_prefix":"2600:9000::/28","service":"CLOUDFRONT"},{"ipv6_prefix":"2406:daba::/40","service":"EC2"}]}
+					""").Select(n => n.ToString()));
+			Assert.Throws<FormatException>(() => CdnCatalog.Parse(CdnListFormat.Lines, "173.245.48.0/20\nnot an address"));
+		}
+
+		[Fact]
+		public void The_published_ranges_name_the_cdn_of_an_address()
+		{
+			var ranges = new CdnRanges();
+			ranges.Replace(new CdnRangeSet { Key = "cloudflare.com", Name = "Cloudflare", Ranges = new() { "104.16.0.0/13", "2606:4700::/32" }, FetchedAt = DateTime.UtcNow });
+
+			Assert.Equal("Cloudflare", ranges.Of(IPAddress.Parse("104.18.2.3"))?.Name);
+			Assert.Equal("Cloudflare", ranges.Of(IPAddress.Parse("::ffff:104.18.2.3"))?.Name);
+			Assert.Equal("Cloudflare", ranges.Of(IPAddress.Parse("2606:4700::1"))?.Name);
+			Assert.Null(ranges.Of(IPAddress.Parse("203.0.113.7")));
+			Assert.Equal(2, ranges.Status["cloudflare.com"].Ranges);
+		}
+
+		[Fact]
+		public async Task Responses_leave_a_cdn_hint_for_their_host_until_one_comes_without()
+		{
+			var hints = new EdgeHints();
+			var answers = new Queue<HttpResponseMessage>(new[] { Response(("cf-ray", "1-FRA")), Response(("server", "nginx")) });
+			using var client = new HttpClient(new EdgeHintsHandler(hints) { InnerHandler = new Answering(answers) });
+
+			await client.GetAsync("https://social.example/.well-known/nodeinfo", TestContext.Current.CancellationToken);
+			Assert.Equal("Cloudflare", hints.Of("social.example")?.Name);
+
+			await client.GetAsync("https://social.example/nodeinfo/2.1", TestContext.Current.CancellationToken);
+			Assert.Null(hints.Of("social.example"));
+		}
+
+		sealed class Answering : HttpMessageHandler
+		{
+			readonly Queue<HttpResponseMessage> _answers;
+
+			public Answering(Queue<HttpResponseMessage> answers) => _answers = answers;
+
+			protected override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken) =>
+				Task.FromResult(_answers.Dequeue());
+		}
+	}
+}

PrivaPub.Tests/Infrastructure/CdnUpdaterTests.cs

@@ -0,0 +1,105 @@
+using Microsoft.Extensions.Logging.Abstractions;
+
+using MongoDB.Entities;
+
+using PrivaPub.Infrastructure.Geo;
+using PrivaPub.Infrastructure.Statistics;
+using PrivaPub.Models.Jobs;
+using PrivaPub.Tests.Support;
+
+using System.Net;
+
+namespace PrivaPub.Tests.Infrastructure
+{
+	[Trait("Category", "Integration")]
+	public sealed class CdnUpdaterTests : IAsyncLifetime
+	{
+		Peer _peer;
+		CdnRanges _ranges;
+		CdnUpdater _updater;
+		string _key;
+
+		public async ValueTask InitializeAsync()
+		{
+			Assert.SkipUnless(MongoFixture.Enabled, MongoFixture.Skip);
+			_peer = await Peer.Start();
+			_ranges = new CdnRanges();
+			_updater = new CdnUpdater(new Clients(), new StaticOptions<StatisticsOptions>(new StatisticsOptions()), _ranges, NullLogger<CdnUpdater>.Instance);
+			_key = $"edge{Guid.NewGuid():N}.example";
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			if (_peer != default)
+				await _peer.DisposeAsync();
+		}
+
+		sealed class Clients : IHttpClientFactory
+		{
+			public HttpClient CreateClient(string name) => new();
+		}
+
+		CdnProvider Provider() => new("Test Edge", _key, Array.Empty<int>(), new[]
+		{
+			new CdnList($"{_peer.A}/edge/v4", CdnListFormat.Lines),
+			new CdnList($"{_peer.A}/edge/v6", CdnListFormat.StringArray)
+		}, _ => false);
+
+		static CancellationToken Token => TestContext.Current.CancellationToken;
+
+		[Fact]
+		public async Task The_published_ranges_are_downloaded_stored_and_used()
+		{
+			_peer.ServeText("/edge/v4", "198.51.100.0/24\n", "text/plain");
+			_peer.ServeText("/edge/v6", """["2001:db8::/32","192.0.2.9"]""", "application/json");
+
+			Assert.Equal(1, await _updater.Update(new[] { Provider() }, Token));
+
+			var stored = await DB.Default.Find<CdnRangeSet>().Match(s => s.Key == _key).ExecuteSingleAsync(Token);
+			Assert.Equal(new[] { "198.51.100.0/24", "2001:db8::/32", "192.0.2.9/32" }, stored.Ranges);
+			Assert.Equal("Test Edge", _ranges.Of(IPAddress.Parse("198.51.100.20"))?.Name);
+			Assert.Equal("Test Edge", _ranges.Of(IPAddress.Parse("192.0.2.9"))?.Name);
+
+			var restarted = new CdnRanges();
+			await restarted.Load(Token);
+			Assert.Equal("Test Edge", restarted.Of(IPAddress.Parse("2001:db8::7"))?.Name);
+		}
+
+		[Theory]
+		[InlineData("not a network")]
+		[InlineData("")]
+		public async Task A_broken_or_empty_list_keeps_the_stored_ranges(string broken)
+		{
+			_peer.ServeText("/edge/v4", "198.51.100.0/24", "text/plain");
+			_peer.ServeText("/edge/v6", "[]", "application/json");
+			Assert.Equal(1, await _updater.Update(new[] { Provider() }, Token));
+
+			_peer.ServeText("/edge/v4", broken, "text/plain");
+			Assert.Equal(0, await _updater.Update(new[] { Provider() }, Token));
+
+			Assert.Equal(new[] { "198.51.100.0/24" }, (await DB.Default.Find<CdnRangeSet>().Match(s => s.Key == _key).ExecuteSingleAsync(Token)).Ranges);
+			Assert.Equal("Test Edge", _ranges.Of(IPAddress.Parse("198.51.100.1"))?.Name);
+		}
+
+		// The real lists, from the CDNs themselves: set PRIVAPUB_TEST_CDN_LIVE=1 to check that every format still parses.
+		[Fact]
+		public async Task Every_cdns_real_list_still_parses()
+		{
+			Assert.SkipUnless(Environment.GetEnvironmentVariable("PRIVAPUB_TEST_CDN_LIVE") == "1", "set PRIVAPUB_TEST_CDN_LIVE=1 to download the real lists");
+			var listed = CdnCatalog.All.Where(p => p.Lists.Length > 0).ToList();
+
+			Assert.Equal(listed.Count, await _updater.Update(listed, Token));
+
+			Assert.Equal("Cloudflare", _ranges.Of(IPAddress.Parse("104.16.0.1"))?.Name);
+			foreach (var provider in listed)
+				Assert.True(_ranges.Status[provider.Key].Ranges > 0, provider.Name);
+		}
+
+		[Fact]
+		public async Task An_unreachable_list_changes_nothing()
+		{
+			Assert.Equal(0, await _updater.Update(new[] { Provider() }, Token));
+			Assert.False(await DB.Default.Find<CdnRangeSet>().Match(s => s.Key == _key).ExecuteAnyAsync(Token));
+		}
+	}
+}

PrivaPub.Tests/Infrastructure/GeoLocatorTests.cs

@@ -1,4 +1,4 @@
-using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Logging.Abstractions;
 
 using PrivaPub.Infrastructure.Geo;
 using PrivaPub.Infrastructure.Http;
@@ -45,7 +45,7 @@ namespace PrivaPub.Tests.Infrastructure
 			Assert.NotNull(fix);
 			Assert.Equal(2, fix.Country.Length);
 			Assert.Equal(13335, fix.Asn);
-			Assert.Equal("Cloudflare", CdnNetworks.Of(fix.Asn));
+			Assert.Equal("Cloudflare", CdnCatalog.OfAsn(fix.Asn)?.Name);
 			Assert.NotNull(fix.AsnOrg);
 			Assert.NotNull(fix.Latitude);
 			Assert.Equal(Math.Round(fix.Latitude.Value, 1), fix.Latitude);
@@ -61,9 +61,9 @@ namespace PrivaPub.Tests.Infrastructure
 
 			Assert.Equal(IPAddress.Parse("203.0.113.7"), connected.Of("social.example"));
 			Assert.Null(connected.Of("other.example"));
-			Assert.Equal("Fastly", CdnNetworks.Of(54113));
+			Assert.Equal("Fastly", CdnCatalog.OfAsn(54113)?.Name);
-			Assert.Null(CdnNetworks.Of(64496));
+			Assert.Null(CdnCatalog.OfAsn(64496));
-			Assert.Null(CdnNetworks.Of(default));
+			Assert.Null(CdnCatalog.OfAsn(default));
 		}
 	}
 }

PrivaPub.Tests/Infrastructure/GeoUpdaterTests.cs

@@ -0,0 +1,125 @@
+using MaxMind.Db;
+
+using Microsoft.Extensions.Logging.Abstractions;
+
+using PrivaPub.Infrastructure.Geo;
+using PrivaPub.Infrastructure.Statistics;
+using PrivaPub.Tests.Support;
+
+using System.IO.Compression;
+
+namespace PrivaPub.Tests.Infrastructure
+{
+	public sealed class GeoUpdaterTests : IAsyncLifetime
+	{
+		static readonly DateTime Now = new(2026, 10, 4, 12, 0, 0, DateTimeKind.Utc);
+		static readonly DateTime LastMonth = new(2026, 9, 2, 0, 0, 0, DateTimeKind.Utc);
+
+		readonly string _directory = Path.Combine(Path.GetTempPath(), $"privapub-geo-{Guid.NewGuid():N}");
+		Peer _peer;
+		GeoUpdater _updater;
+		DbIpLocator _locator;
+
+		public async ValueTask InitializeAsync()
+		{
+			_peer = await Peer.Start();
+			var options = new StaticOptions<StatisticsOptions>(new StatisticsOptions
+			{
+				GeoDirectory = _directory,
+				Geo = new GeoOptions { DownloadBase = $"{_peer.A}/free" }
+			});
+			_locator = new DbIpLocator(options, NullLogger<DbIpLocator>.Instance);
+			_updater = new GeoUpdater(new Clients(), options, _locator, NullLogger<GeoUpdater>.Instance);
+		}
+
+		public async ValueTask DisposeAsync()
+		{
+			_locator?.Dispose();
+			await _peer.DisposeAsync();
+			if (Directory.Exists(_directory))
+				Directory.Delete(_directory, recursive: true);
+		}
+
+		sealed class Clients : IHttpClientFactory
+		{
+			public HttpClient CreateClient(string name) => new();
+		}
+
+		static byte[] Gzip(byte[] bytes)
+		{
+			using var output = new MemoryStream();
+			using (var gzip = new GZipStream(output, CompressionLevel.Fastest))
+				gzip.Write(bytes);
+			return output.ToArray();
+		}
+
+		void Publish(string kind, DateTime month, byte[] database) =>
+			_peer.ServeFile($"/free/dbip-{kind}-lite-{month:yyyy-MM}.mmdb.gz", Gzip(database), "application/gzip");
+
+		static byte[] City(DateTime built) => MiniMmdb.Build("DBIP-City-Lite", built);
+		static byte[] Asn(DateTime built) => MiniMmdb.Build("DBIP-ASN-Lite (compat=GeoLite2-ASN)", built);
+
+		DateTime Built(string kind)
+		{
+			using var reader = new Reader(Path.Combine(_directory, GeoUpdater.FileOf(kind)));
+			return reader.Metadata.BuildDate;
+		}
+
+		[Fact]
+		public async Task Missing_databases_are_fetched_checked_and_read_at_once()
+		{
+			Publish("city", Now, City(Now));
+			Publish("asn", Now, Asn(Now));
+
+			Assert.Equal(2, await _updater.Update(Now, TestContext.Current.CancellationToken));
+
+			Assert.Equal(Now.Date, Built("city").Date);
+			Assert.Equal(Now.Date, Built("asn").Date);
+			Assert.Equal("DB-IP Lite 2026-10", _locator.Source);
+			Assert.Empty(Directory.GetFiles(_directory).Where(f => f.EndsWith(".part") || f.EndsWith(".new")));
+		}
+
+		[Fact]
+		public async Task Early_in_the_month_last_months_database_is_used_and_not_fetched_again()
+		{
+			Publish("city", LastMonth, City(LastMonth));
+			Publish("asn", LastMonth, Asn(LastMonth));
+
+			Assert.Equal(2, await _updater.Update(Now, TestContext.Current.CancellationToken));
+			var asked = _peer.Requests.Count;
+			Assert.Equal(0, await _updater.Update(Now, TestContext.Current.CancellationToken));
+
+			Assert.Equal(LastMonth.Date, Built("city").Date);
+			Assert.DoesNotContain(_peer.Requests.Skip(asked), r => r.Path.Contains("2026-09"));
+		}
+
+		[Fact]
+		public async Task A_current_database_asks_nothing()
+		{
+			Publish("city", Now, City(Now));
+			Publish("asn", Now, Asn(Now));
+			await _updater.Update(Now, TestContext.Current.CancellationToken);
+			var asked = _peer.Requests.Count;
+
+			Assert.Equal(0, await _updater.Update(Now.AddDays(1), TestContext.Current.CancellationToken));
+
+			Assert.Equal(asked, _peer.Requests.Count);
+		}
+
+		[Fact]
+		public async Task A_broken_or_wrong_database_is_refused_and_the_old_one_kept()
+		{
+			Publish("city", LastMonth, City(LastMonth));
+			Publish("asn", LastMonth, Asn(LastMonth));
+			await _updater.Update(LastMonth.AddDays(1), TestContext.Current.CancellationToken);
+			Publish("city", Now, "not a database at all"u8.ToArray());
+			Publish("asn", Now, City(Now));
+
+			Assert.Equal(0, await _updater.Update(Now, TestContext.Current.CancellationToken));
+
+			Assert.Equal(LastMonth.Date, Built("city").Date);
+			Assert.Equal(LastMonth.Date, Built("asn").Date);
+			Assert.Empty(Directory.GetFiles(_directory).Where(f => f.EndsWith(".part") || f.EndsWith(".new")));
+		}
+	}
+}

PrivaPub.Tests/Statistics/DescribeTests.cs

@@ -1,4 +1,4 @@
-using Microsoft.Extensions.Logging.Abstractions;
+using Microsoft.Extensions.Logging.Abstractions;
 
 using MongoDB.Entities;
 
@@ -78,16 +78,16 @@ namespace PrivaPub.Tests.Statistics
 		}
 
 		[Fact]
-		public void The_public_location_depends_on_size_and_on_a_cdn()
+		public void The_public_location_is_where_the_server_was_located_unless_a_cdn_hides_it()
 		{
 			var geo = new InstanceGeo { Country = "DE", City = "Berlin", Latitude = 52.5, Longitude = 13.4, AsnOrg = "Hetzner", Asn = 24940 };
 
-			Assert.Equal(new PublicLocation("DE", "Berlin", 52.5, 13.4, "Hetzner", null), PublicGeo.Project(new RemoteInstance { Geo = geo, UsersTotal = 10 }, 10));
+			Assert.Equal(new PublicLocation("DE", "Berlin", 52.5, 13.4, "Hetzner", null), PublicGeo.Project(geo));
-			Assert.Equal(new PublicLocation("DE", null, null, null, null, null), PublicGeo.Project(new RemoteInstance { Geo = geo, UsersTotal = 1 }, 10));
+			Assert.Equal(new PublicLocation("DE", null, null, null, null, null), PublicGeo.Project(new InstanceGeo { Country = "DE" }));
-			Assert.Equal(new PublicLocation("DE", null, null, null, null, null), PublicGeo.Project(new RemoteInstance { Geo = geo }, 10));
 			Assert.Equal(new PublicLocation(null, null, null, null, null, "Cloudflare"),
-				PublicGeo.Project(new RemoteInstance { Geo = new InstanceGeo { Country = "US", City = "SF", Cdn = "Cloudflare" }, UsersTotal = 5000 }, 10));
+				PublicGeo.Project(new InstanceGeo { Country = "US", City = "SF", Latitude = 37.8, Longitude = -122.4, Cdn = "Cloudflare" }));
-			Assert.Null(PublicGeo.Project(new RemoteInstance(), 10));
+			Assert.Null(PublicGeo.Project(new InstanceGeo()));
+			Assert.Null(PublicGeo.Project(null));
 		}
 	}
 
@@ -112,7 +112,8 @@ namespace PrivaPub.Tests.Statistics
 		{
 			readonly string _peer;
 
-			public PeerDescriber(IFederationHttp http, IGeoLocator geo, IConnectedAddresses addresses, string peer) : base(http, geo, addresses) => _peer = peer;
+			public PeerDescriber(IFederationHttp http, IGeoLocator geo, IConnectedAddresses addresses, string peer, ICdnRanges ranges = default,
+				IEdgeHints edges = default) : base(http, geo, addresses, ranges, edges) => _peer = peer;
 
 			protected override string Address(string url) => _peer + new Uri(url).PathAndQuery;
 		}
@@ -155,6 +156,31 @@ namespace PrivaPub.Tests.Statistics
 			Assert.Equal(InstanceDescriber.Week(DateTime.UtcNow), snapshot.Week);
 		}
 
+		[Fact]
+		public async Task A_cdn_is_found_by_its_published_ranges_first_then_by_its_headers()
+		{
+			var token = TestContext.Current.CancellationToken;
+			var listed = $"listed{Guid.NewGuid():N}.example";
+			var hinted = $"hinted{Guid.NewGuid():N}.example";
+			ServeServer("/" + listed, "mastodon");
+			ServeServer("/" + hinted, "mastodon");
+			var addresses = new ConnectedAddresses();
+			var ranges = new CdnRanges();
+			ranges.Replace(new CdnRangeSet { Key = "cloudflare.com", Name = "Cloudflare", Ranges = new() { "127.0.0.0/8" }, FetchedAt = DateTime.UtcNow });
+			var edges = new EdgeHints();
+			edges.Remember("127.0.0.1", CdnCatalog.ByKey("fastly.com"));
+
+			await new PeerDescriber(Peer.Http(connected: addresses), new FixedGeo(), addresses, _peer.A + "/" + listed, ranges, edges).Describe(listed, crawled: false, default, token);
+			await new PeerDescriber(Peer.Http(connected: addresses), new FixedGeo(), addresses, _peer.A + "/" + hinted, new CdnRanges(), edges).Describe(hinted, crawled: false, default, token);
+
+			var listedOne = await DB.Default.Find<RemoteInstance>().Match(i => i.Host == listed).ExecuteSingleAsync(token);
+			Assert.Equal(("Cloudflare", "cloudflare.com", "ranges"), (listedOne.Geo.Cdn, listedOne.Geo.CdnDomain, listedOne.Geo.CdnSource));
+			var hintedOne = await DB.Default.Find<RemoteInstance>().Match(i => i.Host == hinted).ExecuteSingleAsync(token);
+			Assert.Equal(("Fastly", "fastly.com", "headers"), (hintedOne.Geo.Cdn, hintedOne.Geo.CdnDomain, hintedOne.Geo.CdnSource));
+			var snapshot = await DB.Default.Find<RemoteInstanceSnapshot>().Match(s => s.Host == listed).ExecuteSingleAsync(token);
+			Assert.Equal(("Cloudflare", "cloudflare.com", "ranges", "Amsterdam", 52.4), (snapshot.Cdn, snapshot.CdnDomain, snapshot.CdnSource, snapshot.City, snapshot.Latitude!.Value));
+		}
+
 		[Fact]
 		public async Task Without_api_v2_the_v1_api_is_read_and_an_unreachable_week_is_recorded_too()
 		{

PrivaPub.Tests/Support/Host/Accounts.cs

@@ -39,7 +39,7 @@ namespace PrivaPub.Tests.Support.Host
 		public static async Task<Root> Admin(this PrivaPubHost host)
 		{
 			var root = await host.SignUp("admin");
-			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }));
+			Assert.Equal(0, await AdminCommands.Run(new[] { "promote", root.UserName }, host.Services));
 			return await host.LogIn(root);
 		}
 

PrivaPub.Tests/Support/Host/PrivaPubHost.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Builder;
+using Microsoft.AspNetCore.Builder;
 using Microsoft.AspNetCore.DataProtection;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.AspNetCore.Http;
@@ -73,6 +73,9 @@ namespace PrivaPub.Tests.Support.Host
 			["Federation:AllowPrivateNetworks"] = "true",
 			["Federation:AllowPlainHttp"] = "true",
 			["Federation:FetchLinkPreviews"] = "false",
+			["Registrations:Mode"] = "Open",
+			["Statistics:Geo:AutoUpdate"] = "false",
+			["Statistics:Cdn:AutoUpdate"] = "false",
 			["Media:Root"] = _mediaRoot,
 			["Logging:LogLevel:Default"] = "Warning",
 			["Serilog:MinimumLevel:Default"] = Environment.GetEnvironmentVariable("PRIVAPUB_TEST_LOGS") == "1" ? "Information" : "Fatal"

PrivaPub.Tests/Support/MiniMmdb.cs

@@ -0,0 +1,79 @@
+using System.Text;
+
+namespace PrivaPub.Tests.Support
+{
+	// The smallest MaxMind DB the reader accepts (https://maxmind.github.io/MaxMind-DB/): an IPv4 search tree of one node
+	// whose two records both mean "no data", an empty data section, and the metadata map, which is all a test of the updater
+	// needs to tell a city database from an ASN one and to read its build date.
+	public static class MiniMmdb
+	{
+		public static byte[] Build(string databaseType, DateTime built)
+		{
+			using var output = new MemoryStream();
+			const uint nodeCount = 1;
+			for (var record = 0; record < 2; record++)
+				output.Write(new byte[] { 0, 0, (byte)nodeCount });//24-bit records equal to node_count: not found
+			output.Write(new byte[16]);//data section separator; the data section itself is empty
+			output.Write(new byte[] { 0xAB, 0xCD, 0xEF });
+			output.Write(Encoding.ASCII.GetBytes("MaxMind.com"));
+			Map(output,
+				("binary_format_major_version", w => UInt16(w, 2)),
+				("binary_format_minor_version", w => UInt16(w, 0)),
+				("build_epoch", w => UInt64(w, (ulong)new DateTimeOffset(built).ToUnixTimeSeconds())),
+				("database_type", w => Text(w, databaseType)),
+				("description", w => Map(w, ("en", x => Text(x, "a test database")))),
+				("ip_version", w => UInt16(w, 4)),
+				("languages", w => Array(w, x => Text(x, "en"))),
+				("node_count", w => UInt32(w, nodeCount)),
+				("record_size", w => UInt16(w, 24)));
+			return output.ToArray();
+		}
+
+		// type in the top three bits (0 and an extra byte for the extended types), size below 29 in the low five, or 29 and the
+		// rest in one more byte (names longer than 28 characters need it)
+		static void Control(Stream output, int type, int size)
+		{
+			var low = size < 29 ? size : 29;
+			output.WriteByte((byte)((type <= 7 ? type : 0) << 5 | low));
+			if (type > 7)
+				output.WriteByte((byte)(type - 7));
+			if (size >= 29)
+				output.WriteByte((byte)(size - 29));
+		}
+
+		static void Text(Stream output, string value)
+		{
+			var bytes = Encoding.UTF8.GetBytes(value);
+			Control(output, 2, bytes.Length);
+			output.Write(bytes);
+		}
+
+		static void Unsigned(Stream output, int type, ulong value)
+		{
+			var bytes = BitConverter.GetBytes(value).Reverse().SkipWhile(b => b == 0).ToArray();
+			Control(output, type, bytes.Length);
+			output.Write(bytes);
+		}
+
+		static void UInt16(Stream output, ushort value) => Unsigned(output, 5, value);
+		static void UInt32(Stream output, uint value) => Unsigned(output, 6, value);
+		static void UInt64(Stream output, ulong value) => Unsigned(output, 9, value);
+
+		static void Map(Stream output, params (string Key, Action<Stream> Value)[] entries)
+		{
+			Control(output, 7, entries.Length);
+			foreach (var (key, value) in entries)
+			{
+				Text(output, key);
+				value(output);
+			}
+		}
+
+		static void Array(Stream output, params Action<Stream>[] items)
+		{
+			Control(output, 11, items.Length);
+			foreach (var item in items)
+				item(output);
+		}
+	}
+}

PrivaPub/Api/Mastodon/Auth/OAuthSetup.cs

@@ -49,7 +49,14 @@ namespace PrivaPub.Api.Mastodon.Auth
 						.SetTokenEndpointUris("/oauth/token")
 						.SetRevocationEndpointUris("/oauth/revoke")
 						.SetConfigurationEndpointUris("/.well-known/openid-configuration", "/.well-known/oauth-authorization-server");
-					options.AllowAuthorizationCodeFlow().AllowClientCredentialsFlow();
+					options.AllowAuthorizationCodeFlow().AllowClientCredentialsFlow().AllowTokenExchangeFlow();
+					//the only subject token accepted is the root JWT, for PersonaExchange; OpenIddict's own tokens are not exchanged
+					options.Configure(server =>
+					{
+						server.SubjectTokenTypes.Clear();
+						server.SubjectTokenTypes.Add(PersonaExchange.SubjectTokenType);
+					});
+					options.AddEventHandler(RootJwtSubjectToken.Descriptor);
 					options.RegisterScopes(MastodonScopes.All);
 					options.UseReferenceAccessTokens();
 					options.SetAccessTokenLifetime(null);

PrivaPub/Api/Mastodon/Auth/PersonaExchange.cs

@@ -0,0 +1,105 @@
+using Microsoft.IdentityModel.Tokens;
+
+using OpenIddict.Abstractions;
+using OpenIddict.Server;
+
+using PrivaPub.Services;
+using PrivaPub.StaticServices;
+
+using System.Security.Claims;
+
+using static OpenIddict.Abstractions.OpenIddictConstants;
+using static OpenIddict.Server.OpenIddictServerEvents;
+
+namespace PrivaPub.Api.Mastodon.Auth
+{
+	// One sign-in for the first-party client (decePubClient): it signs in on /clientapi, then exchanges that root JWT for one
+	// persona's Mastodon token (RFC 8693, grant_type urn:ietf:params:oauth:grant-type:token-exchange, subject_token_type
+	// urn:ietf:params:oauth:token-type:jwt, avatar_id). Only the seeded first-party application holds the grant permission,
+	// and the issued token is the same kind the authorization code flow issues: subject the avatar, never the root.
+	public static class PersonaExchange
+	{
+		public const string SubjectTokenType = "urn:ietf:params:oauth:token-type:jwt";
+		public const string AvatarParameter = "avatar_id";
+		//the root the subject token belongs to; it lives on the subject token's principal only, which is never stored or issued
+		public const string RootClaim = "privapub_root";
+
+		public static string FirstPartyClientId(IConfiguration configuration) =>
+			configuration["ClientApi:FirstPartyClientId"] is { Length: > 0 } clientId ? clientId : "decepub";
+
+		//the first-party application: public (a browser keeps no secret), token exchange only, no redirect
+		public static async Task EnsureFirstPartyClient(IServiceProvider services, CancellationToken token)
+		{
+			using var scope = services.CreateScope();
+			var applications = scope.ServiceProvider.GetRequiredService<IOpenIddictApplicationManager>();
+			var clientId = FirstPartyClientId(scope.ServiceProvider.GetRequiredService<IConfiguration>());
+			var descriptor = new OpenIddictApplicationDescriptor
+			{
+				ClientId = clientId,
+				ClientType = ClientTypes.Public,
+				ConsentType = ConsentTypes.Implicit,
+				DisplayName = "decePubClient",
+				Permissions =
+				{
+					Permissions.Endpoints.Token,
+					Permissions.Endpoints.Revocation,
+					Permissions.GrantTypes.TokenExchange
+				}
+			};
+			foreach (var scopeName in new[] { "read", "write", "follow" })
+				descriptor.Permissions.Add(Permissions.Prefixes.Scope + scopeName);
+
+			var existing = await applications.FindByClientIdAsync(clientId, token);
+			if (existing == default)
+			{
+				await applications.CreateAsync(descriptor, token);
+				return;
+			}
+			await applications.PopulateAsync(existing, descriptor, token);
+			await applications.UpdateAsync(existing, token);
+		}
+	}
+
+	// Validates a root JWT given as a token exchange subject token, before OpenIddict tries it as one of its own tokens.
+	// The principal it builds names the root under PersonaExchange.RootClaim for TokenController, which signs in a fresh
+	// identity for the avatar.
+	public sealed class RootJwtSubjectToken : IOpenIddictServerHandler<ValidateTokenContext>
+	{
+		public static OpenIddictServerHandlerDescriptor Descriptor { get; } = OpenIddictServerHandlerDescriptor.CreateBuilder<ValidateTokenContext>()
+			.UseScopedHandler<RootJwtSubjectToken>()
+			.SetOrder(OpenIddictServerHandlers.Protection.ValidateIdentityModelToken.Descriptor.Order - 500)
+			.SetType(OpenIddictServerHandlerType.Custom)
+			.Build();
+
+		readonly IConfiguration _configuration;
+		readonly DbEntities _dbEntities;
+
+		public RootJwtSubjectToken(IConfiguration configuration, DbEntities dbEntities)
+		{
+			_configuration = configuration;
+			_dbEntities = dbEntities;
+		}
+
+		public async ValueTask HandleAsync(ValidateTokenContext context)
+		{
+			if (context.ValidTokenTypes.Count != 1 || !context.ValidTokenTypes.Contains(PersonaExchange.SubjectTokenType))
+				return;
+
+			var root = await RootJwt.Root(context.Token, _configuration, _dbEntities, context.Transaction.CancellationToken);
+			if (root == default)
+			{
+				context.Reject(Errors.InvalidGrant, "The session token is not valid.");
+				return;
+			}
+
+			var identity = new ClaimsIdentity(TokenValidationParameters.DefaultAuthenticationType, Claims.Name, Claims.Role);
+			identity.SetClaim(PersonaExchange.RootClaim, root.ID);
+			var principal = new ClaimsPrincipal(identity)
+				.SetTokenType(PersonaExchange.SubjectTokenType)
+				.SetCreationDate(DateTimeOffset.UtcNow);
+			if (context.ValidPresenters.Count > 0)
+				principal.SetPresenters(context.ValidPresenters);
+			context.Principal = principal;
+		}
+	}
+}

PrivaPub/Api/Mastodon/Auth/TokenController.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore;
+using Microsoft.AspNetCore;
 using Microsoft.AspNetCore.Authentication;
 using Microsoft.AspNetCore.Mvc;
 using Microsoft.IdentityModel.Tokens;
@@ -48,9 +48,33 @@ namespace PrivaPub.Api.Mastodon.Auth
 				return SignIn(new ClaimsPrincipal(identity), OpenIddictServerAspNetCoreDefaults.AuthenticationScheme);
 			}
 
+			if (request.IsTokenExchangeGrantType())
+				return await Persona(request, token);
+
 			return Refuse(Errors.UnsupportedGrantType, "The grant type is not supported.");
 		}
 
+		//PersonaExchange: the root JWT, validated by RootJwtSubjectToken, for a token of one of the root's personas
+		async Task<IActionResult> Persona(OpenIddictRequest request, CancellationToken token)
+		{
+			var subject = (await HttpContext.AuthenticateAsync(OpenIddictServerAspNetCoreDefaults.AuthenticationScheme)).Principal;
+			var rootId = subject?.GetClaim(PersonaExchange.RootClaim);
+			var avatarId = (string)request[PersonaExchange.AvatarParameter];
+			if (string.IsNullOrEmpty(rootId) || string.IsNullOrEmpty(avatarId))
+				return Refuse(Errors.InvalidGrant, "The persona can no longer be used.");
+			var owns = await _dbEntities.RootToAvatars.Match(r => r.RootId == rootId && r.AvatarId == avatarId).ExecuteAnyAsync(token);
+			var avatar = owns ? await _dbEntities.Avatars.MatchID(avatarId).ExecuteFirstAsync(token) : default;
+			if (avatar == default || !await Usable(avatarId, token))
+				return Refuse(Errors.InvalidGrant, "The persona can no longer be used.");
+
+			var identity = new ClaimsIdentity(TokenValidationParameters.DefaultAuthenticationType, Claims.Name, Claims.Role);
+			identity.SetClaim(Claims.Subject, avatar.ID);
+			identity.SetClaim(Claims.Name, avatar.UserName);
+			identity.SetScopes(MastodonScopes.Parse(request.Scope).Intersect(new[] { "read", "write", "follow" }));
+			identity.SetDestinations(_ => new[] { Destinations.AccessToken });
+			return SignIn(new ClaimsPrincipal(identity), OpenIddictServerAspNetCoreDefaults.AuthenticationScheme);
+		}
+
 		async Task<bool> Usable(string avatarId, CancellationToken token)
 		{
 			if (string.IsNullOrEmpty(avatarId))

PrivaPub/Api/Mastodon/Controllers/AccountsController.cs

@@ -71,8 +71,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				avatar.Settings.IsDiscoverable = discoverable;
 			if (Params.Bool("indexable") is { } indexable)
 				avatar.Settings.IsIndexable = indexable;
-			if (Params.Bool("hide_collections") is { } hide)
+			// hide_collections stays true: who follows whom is never listed here, only counted (FEDERATION.md)
-				avatar.Settings.HideCollections = hide;
 			if (Params.Get("source[privacy]") is { } privacy && privacy is "public" or "unlisted" or "private")
 				avatar.Settings.DefaultVisibility = privacy;
 			if (Params.Bool("source[sensitive]") is { } sensitive)
@@ -120,7 +119,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			}
 			var userName = parts[0];
 			var domain = parts[1].ToLowerInvariant();
-			var foreign = await _dbEntities.ForeignAvatars.Match(f => f.UserName == userName && f.Domain == domain).ExecuteFirstAsync(token);
+			var foreign = await _dbEntities.ForeignAvatars.Match(f => f.UserName == userName && f.Domain == domain && !f.DeletionAt.HasValue).ExecuteFirstAsync(token);
 			return foreign == default ? NotFoundError() : Json(_mapper.Foreign(foreign));
 		}
 
@@ -197,8 +196,9 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			var (local, _) = await Find(id, token);
 			if (local == default || local.Id != MyId)
 				return Json(Array.Empty<Account>());
-			var followers = await _dbEntities.Followers.Match(f => f.LocalActorId == local.Id && f.LocalActorKind == local.Kind && f.IsAccepted)
+			var followers = await Page.From(Params, Limit(40, 80))
-				.Sort(f => f.ID, Order.Descending).Limit(Limit(40, 80)).ExecuteAsync(token);
+				.Fetch(_dbEntities.Followers.Match(f => f.LocalActorId == local.Id && f.LocalActorKind == local.Kind && f.IsAccepted), f => f.ID, token);
+			Link($"/api/v1/accounts/{id}/followers", followers.LastOrDefault()?.ID, followers.FirstOrDefault()?.ID);
 			return Json(await AccountsFor(followers.Select(f => f.ActorURI), token));
 		}
 
@@ -208,8 +208,9 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			var (local, _) = await Find(id, token);
 			if (local == default || local.Id != MyId)
 				return Json(Array.Empty<Account>());
-			var following = await _dbEntities.Followings.Match(f => f.AvatarId == local.Id && f.State == FollowState.Accepted)
+			var following = await Page.From(Params, Limit(40, 80))
-				.Sort(f => f.ID, Order.Descending).Limit(Limit(40, 80)).ExecuteAsync(token);
+				.Fetch(_dbEntities.Followings.Match(f => f.AvatarId == local.Id && f.State == FollowState.Accepted), f => f.ID, token);
+			Link($"/api/v1/accounts/{id}/following", following.LastOrDefault()?.ID, following.FirstOrDefault()?.ID);
 			var accounts = await _mapper.Accounts(following.Select(f => f.TargetAccountId), token);
 			return Json(following.Select(f => accounts.GetValueOrDefault(f.TargetAccountId)).Where(a => a != default).ToList());
 		}

PrivaPub/Api/Mastodon/Controllers/CdnsController.cs

@@ -0,0 +1,82 @@
+using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Mvc;
+
+using PrivaPub.Api.Mastodon.Infrastructure;
+using PrivaPub.Domain.Statistics;
+
+namespace PrivaPub.Api.Mastodon.Controllers
+{
+	// The CDNs in front of the servers this server knows, each named by its own domain (owner decision 2026-10-04): how many
+	// servers are behind it, how it is recognised, and week by week who joined and who left.
+	public class CdnsController : MastodonController
+	{
+		const int MaxWeeks = 260;
+
+		readonly IServerPlaces _places;
+
+		public CdnsController(IServerPlaces places) => _places = places;
+
+		[HttpGet("/api/privapub/v1/cdns"), Scope("read", requiresUser: false), AllowAnonymous]
+		public async Task<IActionResult> List(CancellationToken token) => Json((await _places.Cdns(token)).Select(Summary).ToList());
+
+		[HttpGet("/api/privapub/v1/cdns/{key}"), Scope("read", requiresUser: false), AllowAnonymous]
+		public async Task<IActionResult> Detail(string key, CancellationToken token)
+		{
+			var history = await _places.Cdn(key, Math.Clamp(Params.Int("weeks") ?? 52, 1, MaxWeeks), token);
+			if (history == default)
+				return NotFoundError();
+			var detail = new CdnDetail
+			{
+				Hosts = history.Hosts,
+				HostsTruncated = history.Group.Servers > history.Hosts.Count,
+				Weeks = history.Weeks.Select(w => new CdnWeekEntry { Week = w.Week, Servers = w.Servers, Joined = w.Joined, Left = w.Left }).ToList()
+			};
+			Fill(detail, history.Group);
+			return Json(detail);
+		}
+
+		static CdnSummary Summary(CdnGroup group)
+		{
+			var summary = new CdnSummary();
+			Fill(summary, group);
+			return summary;
+		}
+
+		static void Fill(CdnSummary summary, CdnGroup group)
+		{
+			summary.Key = group.Key;
+			summary.Name = group.Name;
+			summary.Domain = group.Domain;
+			summary.Servers = group.Servers;
+			summary.Ranges = group.Ranges;
+			summary.RangesUpdatedAt = group.RangesUpdatedAt is { } at ? MastodonJson.Time(at) : default;
+			summary.DetectedBy = group.DetectedBy;
+		}
+
+		public class CdnSummary
+		{
+			public string Key { get; set; }
+			public string Name { get; set; }
+			public string Domain { get; set; }
+			public int Servers { get; set; }
+			public int Ranges { get; set; }
+			public string RangesUpdatedAt { get; set; }
+			public List<string> DetectedBy { get; set; } = new();
+		}
+
+		public class CdnDetail : CdnSummary
+		{
+			public List<string> Hosts { get; set; } = new();
+			public bool HostsTruncated { get; set; }
+			public List<CdnWeekEntry> Weeks { get; set; } = new();
+		}
+
+		public class CdnWeekEntry
+		{
+			public string Week { get; set; }
+			public int Servers { get; set; }
+			public List<string> Joined { get; set; } = new();
+			public List<string> Left { get; set; } = new();
+		}
+	}
+}

PrivaPub/Api/Mastodon/Controllers/InstanceController.cs

@@ -1,11 +1,13 @@
 using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
 
 using MongoDB.Entities;
 
 using PrivaPub.Api.Mastodon.Infrastructure;
 using PrivaPub.Domain.Privacy;
 using PrivaPub.Federation.Actors;
+using PrivaPub.Infrastructure;
 using PrivaPub.Models.User;
 
 using PostEntity = PrivaPub.Models.Post.Post;
@@ -18,34 +20,60 @@ namespace PrivaPub.Api.Mastodon.Controllers
 		const string Description = "A small ActivityPub server where one private login keeps several unlinkable public personas.";
 
 		readonly ILocalActorService _localActors;
+		readonly IOptionsMonitor<RegistrationOptions> _registrations;
 
-		public InstanceController(ILocalActorService localActors)
+		public InstanceController(ILocalActorService localActors, IOptionsMonitor<RegistrationOptions> registrations)
 		{
 			_localActors = localActors;
+			_registrations = registrations;
+		}
+
+		bool Open => _registrations.CurrentValue.IsOpen;
+
+		// the languages this server is set up for (AppConfiguration:SupportedLanguages), "en" when none are named
+		public static IReadOnlyList<string> LanguageCodes(IServiceProvider services)
+		{
+			var configured = services.GetRequiredService<Microsoft.Extensions.Options.IOptionsMonitor<Models.AppConfiguration>>().CurrentValue.SupportedLanguages;
+			var codes = (configured ?? new List<string>()).Where(c => !string.IsNullOrWhiteSpace(c)).Select(c => c.Split('-')[0].ToLowerInvariant()).Distinct().ToList();
+			return codes.Count == 0 ? new[] { "en" } : codes;
 		}
 
 		string Domain => new Uri(_localActors.BaseAddress).Authority;
 
-		static object Statuses => new { max_characters = 5000, max_media_attachments = 4, characters_reserved_per_url = 23 };
+		// every limit is what the server enforces, read from where it is enforced
+		static object Statuses => new { max_characters = PrivaPub.Domain.Statuses.StatusService.MaxCharacters, max_media_attachments = 4, characters_reserved_per_url = 23 };
 
-		static object MediaAttachments => new
+		object MediaAttachments
 		{
-			supported_mime_types = new[] { "image/jpeg", "image/png", "image/gif", "image/webp", "video/mp4", "video/webm", "audio/mpeg", "audio/ogg" },
+			get
-			image_size_limit = 16 * 1024 * 1024,
+			{
-			image_matrix_limit = 16_777_216,
+				var media = HttpContext.RequestServices.GetRequiredService<IOptionsMonitor<PrivaPub.Domain.Media.MediaOptions>>().CurrentValue;
-			video_size_limit = 99 * 1024 * 1024,
+				return new
+				{
+					supported_mime_types = PrivaPub.Domain.Media.MediaService.SupportedTypes,
+					image_size_limit = media.MaxImageBytes,
+					image_matrix_limit = media.MaxImageSide * media.MaxImageSide,
+					video_size_limit = media.MaxVideoBytes,
 					video_frame_rate_limit = 60,
 					video_matrix_limit = 2_304_000
 				};
+			}
+		}
 
-		static object Polls => new { max_options = 4, max_characters_per_option = 50, min_expiration = 300, max_expiration = 2_629_746 };
+		static object Polls => new
+		{
+			max_options = PrivaPub.Domain.Statuses.PollService.MaxOptions,
+			max_characters_per_option = PrivaPub.Domain.Statuses.PollService.MaxOptionLength,
+			min_expiration = PrivaPub.Domain.Statuses.PollService.MinExpiration,
+			max_expiration = PrivaPub.Domain.Statuses.PollService.MaxExpiration
+		};
 
 		[HttpGet("/api/v1/instance"), AllowAnonymous]
 		public async Task<IActionResult> V1(CancellationToken token)
 		{
-			var users = await DB.Default.CountAsync<Avatar>(a => !a.DeletionAt.HasValue, token);
+			var users = await Counted.Users(token);
-			var statuses = await DB.Default.CountAsync<PostEntity>(f => f.Where(p => !p.IsFederatedCopy) & f.Where(VisibilityPolicy.IsPublic), token);
+			var statuses = await Counted.LocalPosts(token);
-			var domains = (await DB.Default.Find<ForeignAvatar, string>().Project(a => a.Domain).ExecuteAsync(token)).Distinct().Count();
+			var domains = await KnownServers(token);
 			return Json(new
 			{
 				uri = Domain,
@@ -54,21 +82,27 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				description = Description,
 				email = string.Empty,
 				version = Version,
-				urls = new { streaming_api = $"wss://{Domain}" },
+				urls = new { },//no streaming API yet, so none is advertised
 				stats = new { user_count = users, status_count = statuses, domain_count = domains },
 				thumbnail = $"{_localActors.BaseAddress}/media/missing-header.png",
-				languages = new[] { "en" },
+				languages = LanguageCodes(HttpContext.RequestServices),
-				registrations = false,
+				registrations = Open,
 				approval_required = false,
-				invites_enabled = false,
+				invites_enabled = true,//a group invitation always creates an account
 				configuration = new { accounts = new { max_featured_tags = 0 }, statuses = Statuses, media_attachments = MediaAttachments, polls = Polls },
 				contact_account = default(object),
 				rules = Array.Empty<object>()
 			});
 		}
 
+		// the servers we have exchanged activities with, as the statistics count them. Which ones is not published
+		// (/instance/peers stays empty, as on a Mastodon with its peers API off): on a small server it would say who its
+		// personas talk to.
+		static async Task<long> KnownServers(CancellationToken token) =>
+			await DB.Default.CountAsync<Models.Jobs.RemoteInstance>(i => i.Seen == "touched", token);
+
 		[HttpGet("/api/v2/instance"), AllowAnonymous]
-		public IActionResult V2() => Json(new
+		public async Task<IActionResult> V2(CancellationToken token) => Json(new
 		{
 			domain = Domain,
 			title = "PrivaPub",
@@ -76,19 +110,19 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			api_versions = new { mastodon = 7 },
 			source_url = "https://git.thepra.dev/thepra/SocialPub",
 			description = Description,
-			usage = new { users = new { active_month = 0 } },
+			usage = new { users = new { active_month = await Counted.ActiveUsers(30, token) } },
 			thumbnail = new { url = $"{_localActors.BaseAddress}/media/missing-header.png" },
-			languages = new[] { "en" },
+			languages = LanguageCodes(HttpContext.RequestServices),
 			configuration = new
 			{
-				urls = new { streaming = $"wss://{Domain}" },
+				urls = new { },//no streaming API yet, so none is advertised
-				accounts = new { max_featured_tags = 0, max_pinned_statuses = 0 },
+				accounts = new { max_featured_tags = 0, max_pinned_statuses = StatusesController.MaxPins },
 				statuses = Statuses,
 				media_attachments = MediaAttachments,
 				polls = Polls,
 				translation = new { enabled = false }
 			},
-			registrations = new { enabled = false, approval_required = false, message = default(string) },
+			registrations = new { enabled = Open, approval_required = false, message = Open ? default : RegistrationOptions.ClosedMessage },
 			contact = new { email = string.Empty, account = default(object) },
 			rules = Array.Empty<object>()
 		});

PrivaPub/Api/Mastodon/Controllers/ProvenanceController.cs

@@ -1,11 +1,16 @@
-using Microsoft.AspNetCore.Authorization;
+using Microsoft.AspNetCore.Authorization;
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
 
 using MongoDB.Entities;
 
 using PrivaPub.Api.Mastodon.Infrastructure;
 using PrivaPub.Domain.Privacy;
+using PrivaPub.Domain.Statistics;
+using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Objects;
+using PrivaPub.Infrastructure;
+using PrivaPub.Infrastructure.Geo;
 using PrivaPub.Models.Federation;
 using PrivaPub.Models.Jobs;
 using PrivaPub.Models.Post;
@@ -19,9 +24,25 @@ namespace PrivaPub.Api.Mastodon.Controllers
 {
 	public class ProvenanceController : MastodonController
 	{
-		readonly DbEntities _dbEntities;
+		const int MaxHosts = 40;
 
-		public ProvenanceController(DbEntities dbEntities) => _dbEntities = dbEntities;
+		readonly DbEntities _dbEntities;
+		const int MaxWeeks = 260;
+
+		readonly ISelfLocation _self;
+		readonly IServerPlaces _places;
+		readonly ILocalActorService _localActors;
+		readonly IOptionsMonitor<RegistrationOptions> _registrations;
+
+		public ProvenanceController(DbEntities dbEntities, ISelfLocation self, IServerPlaces places, ILocalActorService localActors,
+			IOptionsMonitor<RegistrationOptions> registrations)
+		{
+			_dbEntities = dbEntities;
+			_self = self;
+			_places = places;
+			_localActors = localActors;
+			_registrations = registrations;
+		}
 
 		[HttpGet("/api/privapub/v1/statuses/{id}/provenance"), Scope("read:statuses", requiresUser: false), AllowAnonymous]
 		public async Task<IActionResult> Status(string id, CancellationToken token)
@@ -38,18 +59,104 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				?? await DB.Default.Find<ObjectRecord>().Match(r => r.ObjectURI == post.ObjectURI).ExecuteFirstAsync(token);
 			var host = record?.Host ?? (Uri.TryCreate(post.ObjectURI, UriKind.Absolute, out var uri) ? uri.Host.ToLowerInvariant() : default);
 			var instance = host == default ? default : await DB.Default.Find<RemoteInstance>().Match(i => i.Host == host).ExecuteFirstAsync(token);
-			return Json(Describe(post, record, instance));
+			var beforeCdn = instance?.Geo?.Cdn == default ? default : (await _places.BeforeCdn(new[] { instance.Host }, token)).GetValueOrDefault(instance.Host);
+			return Json(Describe(post, record, instance, beforeCdn));
 		}
 
 		[HttpGet("/api/privapub/v1/instances/{host}"), Scope("read", requiresUser: false), AllowAnonymous]
 		public async Task<IActionResult> Instance(string host, CancellationToken token)
 		{
-			host = host?.Trim().ToLowerInvariant();
+			var described = await Describe(new[] { host }, token);
-			var instance = await DB.Default.Find<RemoteInstance>().Match(i => i.Host == host).ExecuteFirstAsync(token);
+			return described.Count == 0 ? NotFoundError() : Json(described[0]);
-			return instance == default ? NotFoundError() : Json(Describe(instance));
 		}
 
-		static Provenance Describe(PostEntity post, ObjectRecord record, RemoteInstance instance)
+		//up to MaxHosts at once (host[]=...), in the order asked; hosts this server does not know are left out
+		[HttpGet("/api/privapub/v1/instances"), Scope("read", requiresUser: false), AllowAnonymous]
+		public async Task<IActionResult> Instances(CancellationToken token) => Json(await Describe(Params.List("host"), token));
+
+		//the server's weekly snapshots, newest first (weeks=, at most MaxWeeks): its place as shown publicly, its CDN, its size
+		[HttpGet("/api/privapub/v1/instances/{host}/history"), Scope("read", requiresUser: false), AllowAnonymous]
+		public async Task<IActionResult> History(string host, CancellationToken token)
+		{
+			host = host?.Trim().ToLowerInvariant();
+			if (string.IsNullOrEmpty(host) || host.Length > 253 || !await DB.Default.Find<RemoteInstance>().Match(i => i.Host == host).ExecuteAnyAsync(token))
+				return NotFoundError();
+			var weeks = Math.Clamp(Params.Int("weeks") ?? 52, 1, MaxWeeks);
+			return Json((await _places.History(host, weeks, token)).Select(s => new InstanceWeek
+			{
+				Week = s.Week,
+				TakenAt = MastodonJson.Time(s.TakenAt),
+				Reachable = s.Reachable,
+				Software = s.Software,
+				Version = s.SoftwareVersion,
+				UsersTotal = s.UsersTotal,
+				UsersActiveMonth = s.UsersActiveMonth,
+				LocalPosts = s.LocalPosts,
+				OpenRegistrations = s.OpenRegistrations,
+				Geo = Located(PublicGeo.Project(new InstanceGeo
+				{
+					Country = s.Country, City = s.City, Latitude = s.Latitude, Longitude = s.Longitude, Asn = s.Asn,
+					Cdn = s.Cdn, CdnDomain = s.CdnDomain, CdnSource = s.CdnSource, Ipv6 = s.Ipv6
+				}), new InstanceGeo { Cdn = s.Cdn, CdnDomain = s.CdnDomain ?? CdnCatalog.ByKey(s.Cdn)?.Key, CdnSource = s.CdnSource })
+			}).ToList());
+		}
+
+		async Task<List<InstanceDescription>> Describe(IEnumerable<string> hosts, CancellationToken token)
+		{
+			var wanted = hosts.Select(h => h?.Trim().ToLowerInvariant()).Where(h => !string.IsNullOrEmpty(h) && h.Length <= 253)
+				.Distinct().Take(MaxHosts).ToList();
+			var selfHost = Uri.TryCreate(_localActors.BaseAddress, UriKind.Absolute, out var self) ? self.Host.ToLowerInvariant() : default;
+			var remote = await DB.Default.Find<RemoteInstance>().Match(i => wanted.Contains(i.Host)).ExecuteAsync(token);
+			var beforeCdn = await _places.BeforeCdn(remote.Where(i => i.Geo?.Cdn != default).Select(i => i.Host), token);
+			var described = new List<InstanceDescription>();
+			foreach (var host in wanted)
+			{
+				if (host == selfHost)
+					described.Add(await DescribeSelf(host, token));
+				else if (remote.FirstOrDefault(i => i.Host == host) is { } instance)
+					described.Add(Describe(instance, beforeCdn.GetValueOrDefault(host)));
+			}
+			return described;
+		}
+
+		async Task<InstanceDescription> DescribeSelf(string host, CancellationToken token)
+		{
+			var geo = await _self.Get(token);
+			return new InstanceDescription
+			{
+				Host = host,
+				Software = "privapub",
+				Version = BuildInfo.Ref,
+				NodeName = "PrivaPub",
+				Protocols = new() { "activitypub" },
+				OpenRegistrations = _registrations.CurrentValue.IsOpen,
+				DescribedAt = MastodonJson.Time(DateTime.UtcNow),
+				Geo = Located(PublicGeo.Project(geo), geo)
+			};
+		}
+
+		//the public projection of a server's place (PublicGeo); for a CDN-fronted one, the CDN's domain, how it was found and
+		//where the server was before it
+		static InstanceLocation Located(PublicLocation location, InstanceGeo geo, PlaceBeforeCdn beforeCdn = default) => location == default ? default : new InstanceLocation
+		{
+			Precision = location.Cdn != default ? "cdn" : location.Latitude != default ? "city" : "country",
+			Country = location.Country,
+			City = location.City,
+			Latitude = location.Latitude,
+			Longitude = location.Longitude,
+			Network = location.Network,
+			Cdn = location.Cdn,
+			CdnDomain = location.Cdn != default ? ServerPlaces.KeyOf(geo) : default,
+			CdnSource = location.Cdn != default ? geo?.CdnSource : default,
+			BeforeCdn = location.Cdn == default || beforeCdn == default ? default : new InstancePlace
+			{
+				Week = beforeCdn.Week, Country = beforeCdn.Country, City = beforeCdn.City, Latitude = beforeCdn.Latitude, Longitude = beforeCdn.Longitude
+			},
+			Source = geo?.Source,
+			LocatedAt = geo?.LocatedAt is { } at ? MastodonJson.Time(at) : default
+		};
+
+		Provenance Describe(PostEntity post, ObjectRecord record, RemoteInstance instance, PlaceBeforeCdn beforeCdn)
 		{
 			var raw = record?.Raw == default ? default : JsonNode.Parse(record.Raw) as JsonObject;
 			return new Provenance
@@ -86,11 +193,11 @@ namespace PrivaPub.Api.Mastodon.Controllers
 					RawHash = r.RawHash,
 					Raw = r.Raw == default ? default : JsonNode.Parse(r.Raw)
 				}).ToList() ?? new(),
-				Instance = instance == default ? default : Describe(instance)
+				Instance = instance == default ? default : Describe(instance, beforeCdn)
 			};
 		}
 
-		static InstanceDescription Describe(RemoteInstance instance) => new()
+		static InstanceDescription Describe(RemoteInstance instance, PlaceBeforeCdn beforeCdn) => new()
 		{
 			Host = instance.Host,
 			Software = instance.Software,
@@ -107,7 +214,8 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				UnavailableUntil = instance.UnavailableUntil is { } until ? MastodonJson.Time(until) : default,
 				LastSuccessAt = instance.LastSuccessAt is { } success ? MastodonJson.Time(success) : default,
 				LastFailureAt = instance.LastFailureAt is { } failure ? MastodonJson.Time(failure) : default
-			}
+			},
+			Geo = Located(PublicGeo.Project(instance.Geo), instance.Geo, beforeCdn)
 		};
 
 		public class Provenance
@@ -170,6 +278,48 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			public string DescriptionError { get; set; }
 			public JsonNode NodeInfo { get; set; }
 			public InstanceDelivery Delivery { get; set; }
+			public InstanceLocation Geo { get; set; }
+		}
+
+		//precision: "city" (coordinates to 0.1°, city and network), "country" (located only to a country) or "cdn" (the
+		//CDN's name only)
+		public class InstanceLocation
+		{
+			public string Precision { get; set; }
+			public string Country { get; set; }
+			public string City { get; set; }
+			public double? Latitude { get; set; }
+			public double? Longitude { get; set; }
+			public string Network { get; set; }
+			public string Cdn { get; set; }
+			public string CdnDomain { get; set; }
+			public string CdnSource { get; set; }//"ranges", "headers" or "asn"
+			public InstancePlace BeforeCdn { get; set; }//where a CDN-fronted server was located before the CDN, by its snapshots
+			public string Source { get; set; }
+			public string LocatedAt { get; set; }
+		}
+
+		public class InstancePlace
+		{
+			public string Week { get; set; }
+			public string Country { get; set; }
+			public string City { get; set; }
+			public double? Latitude { get; set; }
+			public double? Longitude { get; set; }
+		}
+
+		public class InstanceWeek
+		{
+			public string Week { get; set; }
+			public string TakenAt { get; set; }
+			public bool Reachable { get; set; }
+			public string Software { get; set; }
+			public string Version { get; set; }
+			public long? UsersTotal { get; set; }
+			public long? UsersActiveMonth { get; set; }
+			public long? LocalPosts { get; set; }
+			public bool? OpenRegistrations { get; set; }
+			public InstanceLocation Geo { get; set; }
 		}
 
 		public class InstanceDelivery

PrivaPub/Api/Mastodon/Controllers/SearchController.cs

@@ -35,11 +35,15 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			_search = search;
 		}
 
-		[HttpGet("/api/v2/search"), Scope("read:search", requiresUser: false)]
+		// Anyone may search, as on Mastodon; only resolving (which fetches from other servers) and paging need a sign-in.
+		[HttpGet("/api/v2/search"), Scope("read:search", requiresUser: false), Microsoft.AspNetCore.Authorization.AllowAnonymous]
 		public async Task<IActionResult> Search(CancellationToken token)
 		{
 			var q = Params.Get("q")?.Trim();
 			var type = Params.Get("type");
+			var offset = Params.Int("offset") ?? 0;
+			if (MyId == default && (Params.Bool("resolve") == true || offset > 0))
+				return Error(StatusCodes.Status401Unauthorized, "Search queries that resolve uris or use offset require the read:search scope");
 			var resolve = Params.Bool("resolve") == true && MyId != default;
 			var results = new SearchResults();
 			if (string.IsNullOrEmpty(q))
@@ -66,7 +70,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 
 			if (type is null or "accounts")
 			{
-				results.Accounts = await _search.Find(q, resolve, Limit(), token);
+				results.Accounts = await _search.Find(q, resolve, Limit(), Math.Max(0, offset), token);
 			}
 			if (type is null or "hashtags" && q.TrimStart('#') is { Length: > 0 } tag)
 				results.Hashtags.Add(new { name = tag.ToLowerInvariant(), url = $"{_localActors.BaseAddress}/tags/{Uri.EscapeDataString(tag.ToLowerInvariant())}", history = Array.Empty<object>() });
@@ -133,5 +137,67 @@ namespace PrivaPub.Api.Mastodon.Controllers
 
 		[HttpGet("/api/v1/push/subscription"), Scope("push")]
 		public IActionResult PushSubscription() => Error(StatusCodes.Status404NotFound, "Record not found");
+
+		// Routes Mastodon answers that we have nothing behind: an empty or default answer lets clients degrade, where a
+		// 404 breaks some of them (Mastodon invariant 5)
+		[HttpGet("/api/v1/directory"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult Directory() => Json(Array.Empty<object>());
+
+		[HttpGet("/api/v1/timelines/link"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult LinkTimeline() => Json(Array.Empty<object>());
+
+		[HttpGet("/api/v1/accounts/{id}/identity_proofs"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult IdentityProofs(string id) => Json(Array.Empty<object>());
+
+		[HttpGet("/api/v1/tags/{name}"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult Tag(string name)
+		{
+			var tag = name?.TrimStart('#').ToLowerInvariant() ?? string.Empty;
+			var baseAddress = HttpContext.RequestServices.GetRequiredService<Federation.Actors.ILocalActorService>().BaseAddress;
+			return Json(new { name = tag, url = $"{baseAddress}/tags/{Uri.EscapeDataString(tag)}", history = Array.Empty<object>(), following = false });
+		}
+
+		[HttpGet("/api/v1/instance/languages"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult Languages() => Json(InstanceController.LanguageCodes(HttpContext.RequestServices)
+			.Select(code => new { code, name = System.Globalization.CultureInfo.GetCultureInfo(code).EnglishName }));
+
+		[HttpGet("/api/v1/instance/translation_languages"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult TranslationLanguages() => Json(new { });
+
+		[HttpGet("/api/v1/instance/domain_blocks"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult InstanceDomainBlocks() => Json(Array.Empty<object>());
+
+		[HttpGet("/api/v1/instance/privacy_policy"), Microsoft.AspNetCore.Authorization.AllowAnonymous]
+		public IActionResult PrivacyPolicy() => Json(new
+		{
+			updated_at = "2026-10-04T00:00:00.000Z",
+			content = "<p>One private login owns several public personas, and nobody but this server's admin can tell they belong "
+				+ "together. What a persona posts is shared as its visibility says; a located post never leaves this server. "
+				+ "Uploads lose their metadata. Statistics name servers, never people: see /stargazing.</p>"
+		});
+
+		[HttpGet("/api/v1/notifications/policy"), Scope("read:notifications")]
+		public IActionResult NotificationPolicyV1() => Json(new
+		{
+			filter_not_following = false,
+			filter_not_followers = false,
+			filter_new_accounts = false,
+			filter_private_mentions = false,
+			summary = new { pending_requests_count = 0, pending_notifications_count = 0 }
+		});
+
+		[HttpGet("/api/v2/notifications/policy"), Scope("read:notifications")]
+		public IActionResult NotificationPolicyV2() => Json(new
+		{
+			for_not_following = "accept",
+			for_not_followers = "accept",
+			for_new_accounts = "accept",
+			for_private_mentions = "accept",
+			for_limited_accounts = "accept",
+			summary = new { pending_requests_count = 0, pending_notifications_count = 0 }
+		});
+
+		[HttpGet("/api/v1/notifications/requests"), Scope("read:notifications")]
+		public IActionResult NotificationRequests() => Json(Array.Empty<object>());
 	}
 }

PrivaPub/Api/Mastodon/Controllers/StatusesController.cs

@@ -273,7 +273,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			await DB.Default.Update<PostEntity>().MatchID(post.ID).Modify(p => p.LocalQuotePolicy, policy).ExecuteAsync(token);
 			post.LocalQuotePolicy = policy;
 			if (!post.IsLocalOnly)
-				await _outbox.Publish(Me, post, ActivityPubRenderer.UpdateOf(post, Me, $"policy-{DateTime.UtcNow.Ticks}"), token);
+				await _outbox.PublishUpdate(Me, post, $"policy-{DateTime.UtcNow.Ticks}", token);
 			return Json(await _mapper.Status(post, MyId, token));
 		}
 

PrivaPub/Api/Mastodon/Controllers/TimelinesController.cs

@@ -177,8 +177,7 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			_dbEntities = dbEntities;
 		}
 
-		[HttpGet("/api/v1/notifications"), Scope("read:notifications")]
+		Find<NotificationEntity, NotificationEntity> Filtered()
-		public async Task<IActionResult> List(CancellationToken token)
 		{
 			var types = Params.List("types").Select(Parse).Where(t => t.HasValue).Select(t => t.Value).ToList();
 			var excluded = Params.List("exclude_types").Select(Parse).Where(t => t.HasValue).Select(t => t.Value).ToList();
@@ -189,11 +188,132 @@ namespace PrivaPub.Api.Mastodon.Controllers
 				query.Match(n => !excluded.Contains(n.Type));
 			if (Params.Get("account_id") is { } accountId)
 				query.Match(n => n.FromAccountId == accountId);
-			var notifications = await Page.From(Params, Limit(15, 30)).Fetch(query, n => n.ID, token);
+			return query;
+		}
+
+		[HttpGet("/api/v1/notifications"), Scope("read:notifications")]
+		public async Task<IActionResult> List(CancellationToken token)
+		{
+			var notifications = await Page.From(Params, Limit(15, 30)).Fetch(Filtered(), n => n.ID, token);
 			Link("/api/v1/notifications", notifications.LastOrDefault()?.ID, notifications.FirstOrDefault()?.ID);
 			return Json(await Map(notifications, token));
 		}
 
+		// Grouped notifications (Mastodon 4.3): api_versions.mastodon says we speak that API, so clients call it. Likes and
+		// boosts of one post group together, as do follows within an hour; everything else stands alone.
+		static readonly HashSet<string> DefaultGrouped = new() { "favourite", "reblog", "follow" };
+
+		HashSet<string> Grouped() => Params.List("grouped_types") is { Count: > 0 } chosen ? chosen.ToHashSet() : DefaultGrouped;
+
+		static string GroupKey(NotificationEntity n, ISet<string> grouped) =>
+			!grouped.Contains(Names[n.Type]) ? $"ungrouped-{n.ID}"
+			: n.Type == NotificationType.Follow ? $"grouped-follow-{n.CreatedAt:yyyyMMddHH}"
+			: string.IsNullOrEmpty(n.PostId) ? $"ungrouped-{n.ID}"
+			: $"grouped-{Names[n.Type]}-{n.PostId}";
+
+		// the notifications a group key stands for
+		System.Linq.Expressions.Expression<Func<NotificationEntity, bool>> InGroup(string key)
+		{
+			var me = MyId;
+			if (key.StartsWith("ungrouped-", StringComparison.Ordinal))
+			{
+				var id = key["ungrouped-".Length..];
+				return n => n.AvatarId == me && n.ID == id;
+			}
+			if (key.StartsWith("grouped-follow-", StringComparison.Ordinal)
+				&& DateTime.TryParseExact(key["grouped-follow-".Length..], "yyyyMMddHH", System.Globalization.CultureInfo.InvariantCulture,
+					System.Globalization.DateTimeStyles.AdjustToUniversal | System.Globalization.DateTimeStyles.AssumeUniversal, out var hour))
+			{
+				var end = hour.AddHours(1);
+				return n => n.AvatarId == me && n.Type == NotificationType.Follow && n.CreatedAt >= hour && n.CreatedAt < end;
+			}
+			if (key.Split('-') is ["grouped", var name, var postId] && Parse(name) is { } type)
+				return n => n.AvatarId == me && n.Type == type && n.PostId == postId;
+			return default;
+		}
+
+		async Task<List<NotificationEntity>> Members(string key, CancellationToken token) =>
+			InGroup(key) is { } filter
+				? await _dbEntities.Notifications.Match(filter).Sort(n => n.ID, Order.Descending).Limit(80).ExecuteAsync(token)
+				: new List<NotificationEntity>();
+
+		async Task<object> Groups(List<NotificationEntity> page, ISet<string> grouped, CancellationToken token)
+		{
+			var mapped = (await Map(page, token)).ToDictionary(n => n.Id);
+			var shown = page.Where(n => mapped.ContainsKey(n.ID)).ToList();
+			var groups = new List<object>();
+			foreach (var group in shown.GroupBy(n => GroupKey(n, grouped)))
+			{
+				var newest = mapped[group.First().ID];
+				var total = group.Key.StartsWith("ungrouped-", StringComparison.Ordinal) ? 1 : await DB.Default.CountAsync(InGroup(group.Key), token);
+				groups.Add(new
+				{
+					group_key = group.Key,
+					notifications_count = Math.Max(total, group.Count()),
+					type = newest.Type,
+					most_recent_notification_id = newest.Id,
+					page_min_id = group.Last().ID,
+					page_max_id = group.First().ID,
+					latest_page_notification_at = newest.CreatedAt,
+					sample_account_ids = group.Select(n => mapped[n.ID].Account.Id).Distinct().Take(8).ToList(),
+					status_id = newest.Status?.Id,
+					emoji = newest.Emoji,
+					emoji_url = newest.EmojiUrl
+				});
+			}
+			return new
+			{
+				accounts = mapped.Values.Select(n => n.Account).DistinctBy(a => a.Id).ToList(),
+				statuses = mapped.Values.Where(n => n.Status != default).Select(n => n.Status).DistinctBy(s => s.Id).ToList(),
+				notification_groups = groups
+			};
+		}
+
+		[HttpGet("/api/v2/notifications"), Scope("read:notifications")]
+		public async Task<IActionResult> GroupedList(CancellationToken token)
+		{
+			var notifications = await Page.From(Params, Limit(40, 80)).Fetch(Filtered(), n => n.ID, token);
+			Link("/api/v2/notifications", notifications.LastOrDefault()?.ID, notifications.FirstOrDefault()?.ID);
+			return Json(await Groups(notifications, Grouped(), token));
+		}
+
+		[HttpGet("/api/v2/notifications/unread_count"), Scope("read:notifications")]
+		public async Task<IActionResult> GroupedUnreadCount(CancellationToken token)
+		{
+			var unread = await Filtered().Match(n => !n.IsRead).Sort(n => n.ID, Order.Descending)
+				.Limit(Math.Clamp(Params.Int("limit") ?? 100, 1, 1000)).ExecuteAsync(token);
+			var shown = (await Map(unread, token)).Select(n => n.Id).ToHashSet();
+			var grouped = Grouped();
+			return Json(new { count = unread.Where(n => shown.Contains(n.ID)).Select(n => GroupKey(n, grouped)).Distinct().Count() });
+		}
+
+		[HttpGet("/api/v2/notifications/{groupKey}"), Scope("read:notifications")]
+		public async Task<IActionResult> Group(string groupKey, CancellationToken token)
+		{
+			var members = await Members(groupKey, token);
+			if (members.Count == 0)
+				return NotFoundError();
+			return Json(await Groups(members, new HashSet<string>(DefaultGrouped.Append(Names[members[0].Type])), token));
+		}
+
+		[HttpGet("/api/v2/notifications/{groupKey}/accounts"), Scope("read:notifications")]
+		public async Task<IActionResult> GroupAccounts(string groupKey, CancellationToken token)
+		{
+			var members = await Members(groupKey, token);
+			if (members.Count == 0)
+				return NotFoundError();
+			return Json((await Map(members, token)).Select(n => n.Account).DistinctBy(a => a.Id).ToList());
+		}
+
+		[HttpPost("/api/v2/notifications/{groupKey}/dismiss"), Scope("write:notifications")]
+		public async Task<IActionResult> DismissGroup(string groupKey, CancellationToken token)
+		{
+			if (InGroup(groupKey) is not { } filter)
+				return NotFoundError();
+			await DB.Default.DeleteAsync(filter);
+			return Json(new { });
+		}
+
 		[HttpGet("/api/v1/notifications/{id}"), Scope("read:notifications")]
 		public async Task<IActionResult> Get(string id, CancellationToken token)
 		{
@@ -216,9 +336,15 @@ namespace PrivaPub.Api.Mastodon.Controllers
 			return Json(new { });
 		}
 
+		// counts what the list would show (Map drops notifications from gone accounts and about hidden posts), at most
+		// `limit` of them, as Mastodon does
 		[HttpGet("/api/v1/notifications/unread_count"), Scope("read:notifications")]
-		public async Task<IActionResult> UnreadCount(CancellationToken token) =>
+		public async Task<IActionResult> UnreadCount(CancellationToken token)
-			Json(new { count = await DB.Default.CountAsync<NotificationEntity>(n => n.AvatarId == MyId && !n.IsRead, token) });
+		{
+			var unread = await DB.Default.Find<NotificationEntity>().Match(n => n.AvatarId == MyId && !n.IsRead)
+				.Sort(n => n.ID, Order.Descending).Limit(Math.Clamp(Params.Int("limit") ?? 100, 1, 1000)).ExecuteAsync(token);
+			return Json(new { count = (await Map(unread, token)).Count });
+		}
 
 		async Task<List<Entities.Notification>> Map(List<NotificationEntity> notifications, CancellationToken token)
 		{

PrivaPub/Api/Mastodon/Entities/Entities.cs

@@ -1,4 +1,4 @@
-namespace PrivaPub.Api.Mastodon.Entities
+namespace PrivaPub.Api.Mastodon.Entities
 {
 	public class Account
 	{
@@ -73,6 +73,7 @@ namespace PrivaPub.Api.Mastodon.Entities
 		public PrivaPubVideo Video { get; set; }
 		public PrivaPubAudio Audio { get; set; }
 		public PrivaPubEvent Event { get; set; }
+		public PrivaPubPlace Place { get; set; }//a remote post's own place (Pixelfed), shown only
 		public PrivaPubVotes Votes { get; set; } = new();
 	}
 
@@ -151,6 +152,7 @@ namespace PrivaPub.Api.Mastodon.Entities
 	{
 		public string Name { get; set; }
 		public string Address { get; set; }
+		public string Country { get; set; }//a post's own place only
 		public double? Latitude { get; set; }
 		public double? Longitude { get; set; }
 		public string Url { get; set; }

PrivaPub/Api/Mastodon/Mappers/AccountSearch.cs

@@ -19,7 +19,10 @@ namespace PrivaPub.Api.Mastodon.Mappers
 			_remoteActors = remoteActors;
 		}
 
-		public async Task<List<Account>> Find(string q, bool resolve, int limit, CancellationToken token)
+		public async Task<List<Account>> Find(string q, bool resolve, int limit, CancellationToken token) => await Find(q, resolve, limit, 0, token);
+
+		// gone accounts (remote ones that deleted themselves, personas of banned or deleted roots) are never found
+		public async Task<List<Account>> Find(string q, bool resolve, int limit, int offset, CancellationToken token)
 		{
 			q = q?.Trim().TrimStart('@');
 			if (string.IsNullOrEmpty(q))
@@ -31,23 +34,30 @@ namespace PrivaPub.Api.Mastodon.Mappers
 			{
 				var userName = parts[0];
 				var domain = parts[1].ToLowerInvariant();
-				var known = await _dbEntities.ForeignAvatars.Match(f => f.UserName == userName && f.Domain == domain).ExecuteFirstAsync(token);
+				var known = await _dbEntities.ForeignAvatars.Match(f => f.UserName == userName && f.Domain == domain && !f.DeletionAt.HasValue).ExecuteFirstAsync(token);
 				if (known == default && resolve)
 				{
 					var actorUri = await _remoteActors.ResolveHandle(q, token);
 					known = actorUri == default ? default : await _remoteActors.GetActor(actorUri, refresh: false, token);
 				}
-				if (known != default)
+				if (known is { DeletionAt: null } && offset == 0)
 					results.Add(_mapper.Foreign(known));
 				return results;
 			}
 
 			var prefix = parts[0].ToLowerInvariant();
-			foreach (var avatar in await _dbEntities.Avatars.Match(a => a.UserName.StartsWith(prefix) && !a.DeletionAt.HasValue && a.Settings.IsDiscoverable != false)
+			var barred = await Domain.Privacy.Counted.BarredPersonas(token);
-				.Limit(limit).ExecuteAsync(token))
+			var locals = await _dbEntities.Avatars
+				.Match(a => a.UserName.StartsWith(prefix) && !a.DeletionAt.HasValue && a.Settings.IsDiscoverable != false && !barred.Contains(a.ID))
+				.Sort(a => a.UserName, MongoDB.Entities.Order.Ascending)
+				.Limit(offset + limit).ExecuteAsync(token);
+			foreach (var avatar in locals.Skip(offset))
 				results.Add(await _mapper.Local(_localActors.FromAvatar(avatar), false, token));
-			foreach (var foreign in await _dbEntities.ForeignAvatars.Match(f => f.UserName.StartsWith(parts[0]) && f.IsDiscoverable)
+			var skipRemote = Math.Max(0, offset - locals.Count);
-				.Limit(Math.Max(0, limit - results.Count)).ExecuteAsync(token))
+			if (results.Count < limit)
+				foreach (var foreign in await _dbEntities.ForeignAvatars.Match(f => f.UserName.StartsWith(parts[0]) && f.IsDiscoverable && !f.DeletionAt.HasValue)
+					.Sort(f => f.UserName, MongoDB.Entities.Order.Ascending)
+					.Skip(skipRemote).Limit(limit - results.Count).ExecuteAsync(token))
 					results.Add(_mapper.Foreign(foreign));
 			return results;
 		}

PrivaPub/Api/Mastodon/Mappers/MastodonMapper.cs

@@ -1,4 +1,4 @@
-using MongoDB.Entities;
+using MongoDB.Entities;
 
 using PrivaPub.Api.Mastodon.Entities;
 using PrivaPub.Api.Mastodon.Infrastructure;
@@ -50,15 +50,11 @@ namespace PrivaPub.Api.Mastodon.Mappers
 				? await DB.Default.CountAsync<Following>(f => f.AvatarId == actor.Id && f.State == FollowState.Accepted, token)
 				: 0;
 			var latest = await _dbEntities.Posts
-				.Match(p => (actor.Kind == LocalActorKind.Group ? p.GroupId == actor.Id : p.GroupUserId == actor.Id) && !p.IsFederatedCopy
+				.Match(Counted.By(actor))
-					&& !p.DeletedAt.HasValue && p.Visibility != PostVisibility.Direct && p.ReblogOfPostId == null)
 				.Sort(p => p.ID, Order.Descending)
 				.Limit(1)
 				.ExecuteFirstAsync(token);
-			var statuses = latest == default
+			var statuses = latest == default ? 0 : await Counted.PostsBy(actor, token);
-				? 0
-				: await DB.Default.CountAsync<PostEntity>(p => (actor.Kind == LocalActorKind.Group ? p.GroupId == actor.Id : p.GroupUserId == actor.Id)
-					&& !p.IsFederatedCopy && !p.DeletedAt.HasValue && p.Visibility != PostVisibility.Direct && p.ReblogOfPostId == null, token);
 
 			var account = new Account
 			{
@@ -71,7 +67,7 @@ namespace PrivaPub.Api.Mastodon.Mappers
 				Discoverable = actor.Discoverable,
 				Indexable = actor.Indexable,
 				Noindex = !actor.Indexable,
-				HideCollections = actor.Settings.HideCollections,
+				HideCollections = true,//follower and following lists are never shown to others, only their counts
 				Group = actor.Kind == LocalActorKind.Group,
 				CreatedAt = MastodonJson.Day(actor.Published),
 				Note = ActivityPubRenderer.Html(actor.Summary),
@@ -124,7 +120,10 @@ namespace PrivaPub.Api.Mastodon.Mappers
 			Avatar = Proxied(foreign.PictureURL) ?? MissingAvatar,
 			AvatarStatic = Proxied(foreign.PictureURL) ?? MissingAvatar,
 			Header = Proxied(foreign.ThumbnailURL) ?? MissingHeader,
-			HeaderStatic = Proxied(foreign.ThumbnailURL) ?? MissingHeader
+			HeaderStatic = Proxied(foreign.ThumbnailURL) ?? MissingHeader,
+			FollowersCount = foreign.FollowersCount ?? 0,//as its server publishes them (AccountCountsJob); 0 while unknown
+			FollowingCount = foreign.FollowingCount ?? 0,
+			StatusesCount = foreign.StatusesCount ?? 0
 		};
 
 		public async Task<Account> Account(string id, CancellationToken token) =>
@@ -141,7 +140,7 @@ namespace PrivaPub.Api.Mastodon.Mappers
 				accounts[avatar.ID] = await Local(_localActors.FromAvatar(avatar), false, token);
 			foreach (var group in await _dbEntities.Groups.Match(g => wanted.Contains(g.ID) && !g.DeletionAt.HasValue && g.Kind == GroupKind.Community).ExecuteAsync(token))
 				accounts[group.ID] = await Local(_localActors.FromGroup(group), false, token);
-			foreach (var foreign in await _dbEntities.ForeignAvatars.Match(f => wanted.Contains(f.ID)).ExecuteAsync(token))
+			foreach (var foreign in await _dbEntities.ForeignAvatars.Match(f => wanted.Contains(f.ID) && !f.DeletionAt.HasValue).ExecuteAsync(token))
 				accounts[foreign.ID] = Foreign(foreign);
 			return accounts;
 		}
@@ -202,8 +201,8 @@ namespace PrivaPub.Api.Mastodon.Mappers
 
 			Status Map(PostEntity post)
 			{
-				if (!accounts.TryGetValue(AuthorOf(post), out var account))
+				if (AuthorOf(post) is not { } author || !accounts.TryGetValue(author, out var account))
-					return default;
+					return default;//a post whose author we cannot show is left out, never a 500
 				var status = new Status
 				{
 					Id = post.ID,
@@ -283,6 +282,7 @@ namespace PrivaPub.Api.Mastodon.Mappers
 						continue;
 					Quote(inner, original);
 					status.Reblog = inner;
+					status.Url = inner.Url;//a boost has no page of its own; /grunts would answer JSON to a browser
 					status.Content = string.Empty;
 					status.Reblogged = reblogged.Contains(original.ID);
 				}
@@ -457,6 +457,10 @@ namespace PrivaPub.Api.Mastodon.Mappers
 				Status = post.Event.Status,
 				Category = post.Event.Category
 			},
+			Place = post.Place == default ? default : new PrivaPubPlace
+			{
+				Name = post.Place.Name, Latitude = post.Place.Latitude, Longitude = post.Place.Longitude, Country = post.Place.Country
+			},
 			Votes = new PrivaPubVotes { Up = post.FavouritesCount, Down = post.DownvotesCount }
 		};
 

PrivaPub/Controllers/ClientToServer/RootUserController.cs

@@ -34,6 +34,7 @@ namespace PrivaPub.Controllers.ClientToServer
 		readonly ILocalActorService LocalActors;
 		readonly AuthTokenManager AuthTokenManager;
 		readonly IOptionsMonitor<AppConfiguration> AppConfiguration;
+		readonly IOptionsMonitor<RegistrationOptions> Registrations;
 		readonly ILogger<RootUserController> Logger;
 		readonly IStringLocalizer Localizer;
 
@@ -43,9 +44,11 @@ namespace PrivaPub.Controllers.ClientToServer
 				ILocalActorService localActors,
 				AuthTokenManager authTokenManager,
 				IOptionsMonitor<AppConfiguration> appConfiguration,
+				IOptionsMonitor<RegistrationOptions> registrations,
 				IStringLocalizer<GenericRes> localizer,
 				ILogger<RootUserController> logger)
 		{
+			Registrations = registrations;
 			UsersService = usersService;
 			GroupUsersService = groupUsersService;
 			AvatarUsersService = avatarUsersService;
@@ -63,6 +66,8 @@ namespace PrivaPub.Controllers.ClientToServer
 		{
 			if (User.Identity?.IsAuthenticated ?? false) return Redirect("/");
 			var result = new WebResult();
+			if (!Registrations.CurrentValue.IsOpen)
+				return StatusCode(StatusCodes.Status403Forbidden, result.Invalidate(Localizer[RegistrationOptions.ClosedMessage], StatusCodes.Status403Forbidden));
 			if (!ModelState.IsValid)
 				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
 			try
@@ -356,7 +361,7 @@ namespace PrivaPub.Controllers.ClientToServer
 				if (!result.IsValid)
 					return StatusCode(result.StatusCode, result);
 
-				return Ok(result);
+				return Ok(result.Data);//the same sentence for everyone
 			}
 			catch (Exception ex)
 			{
@@ -409,26 +414,23 @@ namespace PrivaPub.Controllers.ClientToServer
 			}
 		}
 
-		//[HttpDelete, Route("delete"), Authorize(Policy = Policies.IsUser)]
+		[HttpPost, Route("/clientapi/user/delete"), EnableRateLimiting(RateLimiting.Accounts), Authorize(Policy = Policies.IsUser)]
-		//public async Task<IActionResult> RemoveSelf()
+		public async Task<IActionResult> RemoveSelf(RemoveSelfForm form)
-		//{
+		{
-		//	var result = new WebResult();
+			var result = new WebResult();
-		//	try
+			if (!ModelState.IsValid)
-		//	{
+				return BadRequest(result.Invalidate(Localizer["Invalid model."]));
-		//		//result = await UsersService.RemoveUserAsync(User.GetUserId());
+			try
-		//		if (!result.IsValid)
+			{
-		//			return StatusCode(result.StatusCode, result);
+				result = await UsersService.RemoveSelfAsync(User.GetUserId(), form.Password);
-
+				return result.IsValid ? Ok() : StatusCode(result.StatusCode, result);
-		//		await HttpContext.SignOutAsync();
+			}
-
+			catch (Exception ex)
-		//		return Ok();
+			{
-		//	}
+				Logger.LogError(ex, $"{nameof(User)}.{nameof(RemoveSelf)}()");
-		//	catch (Exception ex)
+				return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
-		//	{
+			}
-		//		Logger.LogError(ex, $"{nameof(User)}.{nameof(RemoveSelf)}()");
+		}
-		//		return BadRequest(result.Invalidate(Localizer["Something went wrong."]));
-		//	}
-		//}
 
 		#endregion User endpoints
 

PrivaPub/Domain/Media/MediaService.cs

@@ -42,6 +42,9 @@ namespace PrivaPub.Domain.Media
 			["audio/mp4"] = "m4a", ["audio/x-m4a"] = "m4a", ["audio/flac"] = "flac", ["audio/webm"] = "webm"
 		};
 
+		// what an upload may be, as the instance API advertises it
+		public static IReadOnlyList<string> SupportedTypes => ImageTypes.Concat(AvTypes.Keys).ToList();
+
 		readonly IOptionsMonitor<MediaOptions> _options;
 		readonly ILocalActorService _localActors;
 		readonly IWebHostEnvironment _environment;

PrivaPub/Domain/Privacy/Counted.cs

@@ -0,0 +1,73 @@
+using MongoDB.Entities;
+
+using PrivaPub.Federation.Actors;
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.Post;
+using PrivaPub.Models.User;
+
+using System.Linq.Expressions;
+
+using PostEntity = PrivaPub.Models.Post.Post;
+
+namespace PrivaPub.Domain.Privacy
+{
+	// What the numbers count, in one place, so a persona's statuses_count, its outbox's totalItems, NodeInfo and the
+	// instance API agree (they used to count four different things).
+	public static class Counted
+	{
+		// Mastodon's statuses_count: every post that is neither deleted nor a direct message, reblogs included. Circle and
+		// located posts count too (owner decision 2026-10-04: "a good balance for the fediverse to work").
+		public static readonly Expression<Func<PostEntity, bool>> Post = p => !p.DeletedAt.HasValue && p.Visibility != PostVisibility.Direct;
+
+		// a persona's own posts, or every post in a group, its remote members' included
+		public static Expression<Func<PostEntity, bool>> By(LocalActor actor)
+		{
+			var id = actor.Id;
+			return actor.Kind == LocalActorKind.Group
+				? p => p.GroupId == id && !p.DeletedAt.HasValue && p.Visibility != PostVisibility.Direct
+				: p => p.GroupUserId == id && !p.IsFederatedCopy && !p.DeletedAt.HasValue && p.Visibility != PostVisibility.Direct;
+		}
+
+		// replies_count counts only public and unlisted replies, as Mastodon does: a count must not tell anyone that a
+		// followers-only, direct or circle reply exists
+		public static bool Reply(PostEntity reply) => reply.Visibility is PostVisibility.Public or PostVisibility.Unlisted;
+
+		public static async Task<long> PostsBy(LocalActor actor, CancellationToken token) =>
+			await DB.Default.CountAsync(By(actor), token);
+
+		// Personas that do not count as this server's users, and are not found in search: those of a banned or deleted root.
+		public static async Task<List<string>> BarredPersonas(CancellationToken token)
+		{
+			var roots = (await DB.Default.Find<RootUser>().Match(u => u.IsBanned || u.DeletedAt != null).Project(u => u.Include(x => x.ID)).ExecuteAsync(token))
+				.Select(u => u.ID).ToList();
+			return roots.Count == 0
+				? new List<string>()
+				: (await DB.Default.Find<RootToAvatar>().Match(ra => roots.Contains(ra.RootId)).ExecuteAsync(token)).Select(ra => ra.AvatarId).ToList();
+		}
+
+		public static async Task<long> Users(CancellationToken token)
+		{
+			var barred = await BarredPersonas(token);
+			return await DB.Default.CountAsync<Avatar>(a => !a.DeletionAt.HasValue && !barred.Contains(a.ID), token);
+		}
+
+		// users who posted within the last days, as NodeInfo's activeMonth and activeHalfyear and the instance API mean it
+		public static async Task<long> ActiveUsers(int days, CancellationToken token)
+		{
+			var barred = await BarredPersonas(token);
+			var since = DateTime.UtcNow.AddDays(-days);
+			var authors = await DB.Default.Find<PostEntity, string>()
+				.Match(p => !p.IsFederatedCopy && p.CreationDate >= since && !barred.Contains(p.GroupUserId))
+				.Project(p => p.GroupUserId)
+				.ExecuteAsync(token);
+			var distinct = authors.Where(a => !string.IsNullOrEmpty(a)).Distinct().ToList();
+			return distinct.Count == 0 ? 0 : await DB.Default.CountAsync<Avatar>(a => distinct.Contains(a.ID) && !a.DeletionAt.HasValue, token);
+		}
+
+		public static async Task<long> LocalPosts(CancellationToken token)
+		{
+			var barred = await BarredPersonas(token);
+			return await DB.Default.CountAsync<PostEntity>(f => f.Where(p => !p.IsFederatedCopy && !barred.Contains(p.GroupUserId)) & f.Where(Post), token);
+		}
+	}
+}

PrivaPub/Domain/Statistics/PublicGeo.cs

@@ -6,18 +6,17 @@ namespace PrivaPub.Domain.Statistics
 
 	public static class PublicGeo
 	{
-		//owner decision: a CDN-fronted server shows only its CDN (the address is an edge), a server reporting at least
+		//a server's place as it is shown publicly: where it was located (country, city, coordinates to 0.1°, network),
-		//minUsers users its city, coordinates and network, any other only its country
+		//except that a CDN-fronted server shows only its CDN, because the address we reached is the CDN's edge
-		public static PublicLocation Project(RemoteInstance instance, int minUsers)
+		public static PublicLocation Project(InstanceGeo geo)
 		{
-			var geo = instance?.Geo;
 			if (geo == default)
 				return default;
 			if (geo.Cdn != default)
 				return new PublicLocation(default, default, default, default, default, geo.Cdn);
-			if (instance.UsersTotal >= minUsers)
+			if (geo.Country == default && geo.Latitude == default)
+				return default;
 			return new PublicLocation(geo.Country, geo.City, geo.Latitude, geo.Longitude, geo.AsnOrg, default);
-			return geo.Country == default ? default : new PublicLocation(geo.Country, default, default, default, default, default);
 		}
 	}
 }

PrivaPub/Domain/Statistics/SelfLocation.cs

@@ -0,0 +1,109 @@
+using Microsoft.Extensions.Options;
+
+using PrivaPub.Infrastructure.Geo;
+using PrivaPub.Infrastructure.Statistics;
+using PrivaPub.Models;
+using PrivaPub.Models.Jobs;
+
+using System.Net;
+using System.Net.Sockets;
+
+namespace PrivaPub.Domain.Statistics
+{
+	public interface ISelfLocation
+	{
+		//where this server is, or default when it cannot tell; Source is "configured" when the owner set it (Statistics:Geo:Self)
+		Task<InstanceGeo> Get(CancellationToken token);
+	}
+
+	// This server's own place, for the instance API (the client's globe draws every server from it). The owner may set it,
+	// for a server behind a proxy or a CDN; otherwise the server's own host name is resolved and located like any other
+	// server's, once a day. Never the address of a request.
+	public class SelfLocation : ISelfLocation
+	{
+		static readonly TimeSpan Lifetime = TimeSpan.FromDays(1);
+
+		readonly IGeoLocator _geo;
+		readonly ICdnRanges _cdnRanges;
+		readonly IOptionsMonitor<StatisticsOptions> _options;
+		readonly IOptionsMonitor<AppConfiguration> _app;
+		readonly ILogger<SelfLocation> _logger;
+		readonly SemaphoreSlim _gate = new(1, 1);
+
+		InstanceGeo _located;
+		DateTime _locatedAt = DateTime.MinValue;
+
+		public SelfLocation(IGeoLocator geo, IOptionsMonitor<StatisticsOptions> options, IOptionsMonitor<AppConfiguration> app, ILogger<SelfLocation> logger,
+			ICdnRanges cdnRanges = default)
+		{
+			_geo = geo;
+			_cdnRanges = cdnRanges;
+			_options = options;
+			_app = app;
+			_logger = logger;
+		}
+
+		public async Task<InstanceGeo> Get(CancellationToken token)
+		{
+			if (_options.CurrentValue.Geo.Self is { Latitude: { } latitude, Longitude: { } longitude } self)
+				return new InstanceGeo
+				{
+					Country = self.Country,
+					City = self.City,
+					Latitude = Math.Round(latitude, 1),
+					Longitude = Math.Round(longitude, 1),
+					Source = "configured"
+				};
+
+			if (DateTime.UtcNow - _locatedAt < Lifetime)
+				return _located;
+			await _gate.WaitAsync(token);
+			try
+			{
+				if (DateTime.UtcNow - _locatedAt >= Lifetime)
+				{
+					_located = await Locate(token);
+					_locatedAt = DateTime.UtcNow;
+				}
+				return _located;
+			}
+			finally
+			{
+				_gate.Release();
+			}
+		}
+
+		async Task<InstanceGeo> Locate(CancellationToken token)
+		{
+			try
+			{
+				if (!Uri.TryCreate(_app.CurrentValue.BackendBaseAddress, UriKind.Absolute, out var self))
+					return default;
+				var addresses = await Dns.GetHostAddressesAsync(self.Host, token);
+				var address = addresses.FirstOrDefault(a => a.AddressFamily == AddressFamily.InterNetwork) ?? addresses.FirstOrDefault();
+				var fix = address == default ? default : _geo.Locate(address);
+				var (cdn, cdnSource) = Federation.Objects.InstanceDescriber.Cdn(address, self.Host, fix?.Asn, _cdnRanges, default);
+				return fix == default ? default : new InstanceGeo
+				{
+					Country = fix.Country,
+					City = fix.City,
+					Latitude = fix.Latitude,
+					Longitude = fix.Longitude,
+					Asn = fix.Asn,
+					AsnOrg = fix.AsnOrg,
+					Cdn = cdn?.Name,
+					CdnDomain = cdn?.Domain,
+					CdnSource = cdnSource,
+					Ipv6 = address.AddressFamily == AddressFamily.InterNetworkV6,
+					Source = _geo.Source,
+					LocatedAt = DateTime.UtcNow
+				};
+			}
+			catch (Exception ex) when (ex is SocketException or ArgumentException)
+			{
+				_logger.LogInformation("{Service}: this server's host does not resolve", nameof(SelfLocation));
+				return default;
+			}
+		}
+	}
+}

PrivaPub/Domain/Statistics/ServerPlaces.cs

@@ -0,0 +1,163 @@
+using Microsoft.Extensions.Caching.Memory;
+
+using MongoDB.Entities;
+
+using PrivaPub.Federation.Objects;
+using PrivaPub.Infrastructure.Geo;
+using PrivaPub.Models.Jobs;
+
+namespace PrivaPub.Domain.Statistics
+{
+	// Where a server was before it went behind a CDN, as its weekly snapshots last saw it.
+	public sealed record PlaceBeforeCdn(string Week, string Country, string City, double? Latitude, double? Longitude);
+
+	// A CDN as a group of servers: those behind it now, and week by week how many were behind it, who joined and who left.
+	public sealed record CdnGroup(string Key, string Name, string Domain, int Servers, int Ranges, DateTime? RangesUpdatedAt, List<string> DetectedBy);
+
+	public sealed record CdnWeek(string Week, int Servers, List<string> Joined, List<string> Left);
+
+	public sealed record CdnHistory(CdnGroup Group, List<string> Hosts, List<CdnWeek> Weeks);
+
+	public interface IServerPlaces
+	{
+		Task<Dictionary<string, PlaceBeforeCdn>> BeforeCdn(IEnumerable<string> hosts, CancellationToken token);
+		Task<List<RemoteInstanceSnapshot>> History(string host, int weeks, CancellationToken token);
+		Task<List<CdnGroup>> Cdns(CancellationToken token);
+		Task<CdnHistory> Cdn(string key, int weeks, CancellationToken token);
+	}
+
+	// Servers through time (owner decision 2026-10-04): each server's weekly snapshots (place, CDN, size), and the servers
+	// grouped by the CDN in front of them, named by the CDN's own domain. Read from the weekly snapshots InstanceDescriber
+	// writes; the CDN pages are kept for half an hour, because a large CDN reads many snapshots.
+	public class ServerPlaces : IServerPlaces
+	{
+		public const int MaxHosts = 500;
+		const int MaxChanges = 50;
+		static readonly TimeSpan CacheFor = TimeSpan.FromMinutes(30);
+
+		readonly ICdnRanges _ranges;
+		readonly IMemoryCache _cache;
+
+		public ServerPlaces(ICdnRanges ranges, IMemoryCache cache)
+		{
+			_ranges = ranges;
+			_cache = cache;
+		}
+
+		// the CDN key a server's place belongs to: the CDN's domain, or its name for a CDN that has none
+		public static string KeyOf(InstanceGeo geo) =>
+			geo?.Cdn == default ? default : geo.CdnDomain ?? CdnCatalog.ByKey(geo.Cdn)?.Key ?? geo.Cdn.ToLowerInvariant();
+
+		static string KeyOf(RemoteInstanceSnapshot snapshot) =>
+			snapshot.Cdn == default ? default : snapshot.CdnDomain ?? CdnCatalog.ByKey(snapshot.Cdn)?.Key ?? snapshot.Cdn.ToLowerInvariant();
+
+		public async Task<Dictionary<string, PlaceBeforeCdn>> BeforeCdn(IEnumerable<string> hosts, CancellationToken token)
+		{
+			var wanted = hosts.Where(h => h != default).Distinct().ToList();
+			if (wanted.Count == 0)
+				return new();
+			var located = await DB.Default.Find<RemoteInstanceSnapshot>()
+				.Match(s => wanted.Contains(s.Host) && s.Cdn == null && (s.Country != null || s.Latitude != null))
+				.Sort(s => s.Week, Order.Descending)
+				.ExecuteAsync(token);
+			return located.GroupBy(s => s.Host)
+				.Select(g => g.First())
+				.ToDictionary(s => s.Host, s => new PlaceBeforeCdn(s.Week, s.Country, s.City, s.Latitude, s.Longitude));
+		}
+
+		public async Task<List<RemoteInstanceSnapshot>> History(string host, int weeks, CancellationToken token) =>
+			await DB.Default.Find<RemoteInstanceSnapshot>()
+				.Match(s => s.Host == host)
+				.Sort(s => s.Week, Order.Descending)
+				.Limit(weeks)
+				.ExecuteAsync(token);
+
+		public async Task<List<CdnGroup>> Cdns(CancellationToken token)
+		{
+			var fronted = await Fronted(token);
+			var status = _ranges.Status;
+			var keys = CdnCatalog.All.Select(p => p.Key).Concat(fronted.Select(i => KeyOf(i.Geo))).Distinct(StringComparer.OrdinalIgnoreCase);
+			return keys.Select(key => Group(key, fronted, status)).OrderByDescending(g => g.Servers).ThenBy(g => g.Name).ToList();
+		}
+
+		public async Task<CdnHistory> Cdn(string key, int weeks, CancellationToken token)
+		{
+			key = key?.Trim().ToLowerInvariant();
+			if (string.IsNullOrEmpty(key) || key.Length > 100)
+				return default;
+			return await _cache.GetOrCreateAsync($"cdn-history|{key}|{weeks}", async entry =>
+			{
+				entry.AbsoluteExpirationRelativeToNow = CacheFor;
+				var fronted = await Fronted(token);
+				var provider = CdnCatalog.ByKey(key);
+				if (provider == default && fronted.All(i => KeyOf(i.Geo) != key))
+					return default;
+				var group = Group(provider?.Key ?? key, fronted, _ranges.Status);
+				var hosts = fronted.Where(i => KeyOf(i.Geo) == group.Key).Select(i => i.Host).OrderBy(h => h).Take(MaxHosts).ToList();
+				return new CdnHistory(group, hosts, await Weeks(group, weeks, token));
+			});
+		}
+
+		async Task<List<CdnWeek>> Weeks(CdnGroup group, int weeks, CancellationToken token)
+		{
+			var since = InstanceDescriber.Week(DateTime.UtcNow.AddDays(-7 * weeks));
+			var everBehind = (await DB.Default.Find<RemoteInstanceSnapshot>()
+					.Match(f => f.Gte(s => s.Week, since) & (f.Eq(s => s.CdnDomain, group.Key) | f.Eq(s => s.Cdn, group.Name)))
+					.Project(s => new RemoteInstanceSnapshot { Host = s.Host })
+					.ExecuteAsync(token))
+				.Select(s => s.Host).Distinct().ToList();
+			if (everBehind.Count == 0)
+				return new();
+
+			var snapshots = await DB.Default.Find<RemoteInstanceSnapshot>()
+				.Match(f => f.In(s => s.Host, everBehind) & f.Gte(s => s.Week, since))
+				.Project(s => new RemoteInstanceSnapshot { Host = s.Host, Week = s.Week, Cdn = s.Cdn, CdnDomain = s.CdnDomain })
+				.ExecuteAsync(token);
+
+			// a server is behind the CDN from the week a snapshot shows it there until one shows it elsewhere
+			var behind = new Dictionary<string, bool>();
+			var history = new List<CdnWeek>();
+			foreach (var week in snapshots.GroupBy(s => s.Week).OrderBy(w => w.Key, StringComparer.Ordinal))
+			{
+				var joined = new List<string>();
+				var left = new List<string>();
+				foreach (var snapshot in week)
+				{
+					var now = KeyOf(snapshot) == group.Key;
+					var before = behind.GetValueOrDefault(snapshot.Host);
+					if (now && !before)
+						joined.Add(snapshot.Host);
+					else if (!now && before)
+						left.Add(snapshot.Host);
+					behind[snapshot.Host] = now;
+				}
+				history.Add(new CdnWeek(week.Key, behind.Count(b => b.Value), joined.OrderBy(h => h).Take(MaxChanges).ToList(),
+					left.OrderBy(h => h).Take(MaxChanges).ToList()));
+			}
+			history.Reverse();
+			return history;
+		}
+
+		static async Task<List<RemoteInstance>> Fronted(CancellationToken token) =>
+			await DB.Default.Find<RemoteInstance>()
+				.Match(i => i.Geo.Cdn != null)
+				.Project(i => new RemoteInstance { Host = i.Host, Geo = i.Geo })
+				.ExecuteAsync(token);
+
+		static CdnGroup Group(string key, List<RemoteInstance> fronted, IReadOnlyDictionary<string, (int Ranges, DateTime FetchedAt)> status)
+		{
+			var provider = CdnCatalog.ByKey(key);
+			var servers = fronted.Where(i => KeyOf(i.Geo) == key).ToList();
+			var detectedBy = new List<string>();
+			if (provider?.Lists.Length > 0)
+				detectedBy.Add("ranges");
+			if (provider != default)
+				detectedBy.Add("headers");
+			if (provider?.Asns.Length > 0)
+				detectedBy.Add("asn");
+			var ranges = status.TryGetValue(key, out var known) ? known : default;
+			return new CdnGroup(key, provider?.Name ?? servers.Select(i => i.Geo.Cdn).FirstOrDefault() ?? key, provider?.Domain, servers.Count, ranges.Ranges,
+				ranges.Ranges > 0 ? ranges.FetchedAt : null, detectedBy);
+		}
+	}
+}

PrivaPub/Domain/Statuses/PollService.cs

@@ -233,7 +233,7 @@ namespace PrivaPub.Domain.Statuses
 				return JobOutcome.Done;
 			await Closing(post, author, token);
 			if (!post.IsLocalOnly)
-				await _outbox.Publish(author, post, ActivityPubRenderer.UpdateOf(post, author, $"poll-{DateTime.UtcNow.Ticks}"), token);
+				await _outbox.PublishUpdate(author, post, $"poll-{DateTime.UtcNow.Ticks}", token);
 			return JobOutcome.Done;
 		}
 

PrivaPub/Domain/Statuses/QuoteService.cs

@@ -239,7 +239,7 @@ namespace PrivaPub.Domain.Statuses
 				.ExecuteAsync(token);
 			await DB.Default.Update<PostEntity>().MatchID(quoted.ID).Modify(b => b.Inc(p => p.QuotesCount, 1)).ExecuteAsync(token);
 			if (!post.IsLocalOnly)
-				await _outbox.Publish(author, post, ActivityPubRenderer.UpdateOf(post, author, "quote-approved"), token);
+				await _outbox.PublishUpdate(author, post, "quote-approved", token);
 			return true;
 		}
 

PrivaPub/Domain/Statuses/StatusService.cs

@@ -95,8 +95,17 @@ namespace PrivaPub.Domain.Statuses
 			_fanout = fanout;
 		}
 
+		public const int MaxCharacters = 5000;//what the instance API advertises as max_characters, and enforced here
+
+		static StatusOutcome TooLong(StatusDraft draft) =>
+			(draft.Text?.Length ?? 0) > MaxCharacters
+				? StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, $"Validation failed: Text character limit of {MaxCharacters} exceeded")
+				: default;
+
 		public async Task<StatusOutcome> Publish(LocalActor author, StatusDraft draft, CancellationToken token)
 		{
+			if (TooLong(draft) is { } tooLong)
+				return tooLong;
 			var media = await Media(author, draft.MediaIds, default, token);
 			if (media == default)
 				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: Media attachments are invalid");
@@ -119,6 +128,11 @@ namespace PrivaPub.Domain.Statuses
 				return StatusOutcome.Fail(StatusCodes.Status404NotFound, "Record not found");
 			if (parent != default && !await VisibilityPolicy.CanSee(parent, author.Id, token))
 				return StatusOutcome.Fail(StatusCodes.Status404NotFound, "Record not found");
+			// a reply in a circle stays in the circle, whichever client wrote it: Mastodon clients know nothing of groups
+			if (group == default && parent is { Visibility: PostVisibility.Circle } && !string.IsNullOrEmpty(parent.GroupId)
+				&& await _dbEntities.Groups.MatchID(parent.GroupId).ExecuteFirstAsync(token) is { DeletionAt: null } parentCircle
+				&& await MayPost(parentCircle, author, token))
+				group = _localActors.FromGroup(parentCircle);
 
 			PostEntity quoted = default;
 			var quotePermission = QuotePermission.Denied;
@@ -161,6 +175,9 @@ namespace PrivaPub.Domain.Statuses
 			var visibility = located ? PostVisibility.LocalGeo
 				: group is { IsCircle: true } ? PostVisibility.Circle
 				: draft.Visibility is PostVisibility.Circle or PostVisibility.LocalGeo ? PostVisibility.Public : draft.Visibility;
+			// asking a quoted post's author for permission would show them the circle post
+			if (visibility == PostVisibility.Circle && quoted != default && quotePermission != QuotePermission.Granted)
+				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: A circle post can only quote a post that needs no permission");
 			var post = new PostEntity
 			{
 				GroupUserId = author.Id,
@@ -231,7 +248,7 @@ namespace PrivaPub.Domain.Statuses
 
 			await DB.Default.SaveAsync(post, token);
 			await Attach(media, post.ID, token);
-			if (parent != default)
+			if (parent != default && Counted.Reply(post))
 				await DB.Default.Update<PostEntity>().MatchID(parent.ID).Modify(b => b.Inc(p => p.RepliesCount, 1)).ExecuteAsync(token);
 			await _fanout.Distribute(post, token);
 			await _polls.Scheduled(post, token);
@@ -252,6 +269,8 @@ namespace PrivaPub.Domain.Statuses
 			var post = await Own(author, postId, token);
 			if (post == default)
 				return StatusOutcome.Fail(StatusCodes.Status404NotFound, "Record not found");
+			if (TooLong(draft) is { } tooLong)
+				return tooLong;
 			var media = draft.MediaIds == default ? default : await Media(author, draft.MediaIds, post.ID, token);
 			if (draft.MediaIds != default && media == default)
 				return StatusOutcome.Fail(StatusCodes.Status422UnprocessableEntity, "Validation failed: Media attachments are invalid");
@@ -334,13 +353,17 @@ namespace PrivaPub.Domain.Statuses
 				.Modify(p => p.Revisions, new List<PostRevision>())
 				.ExecuteAsync(token);
 			await DB.Default.DeleteAsync<TimelineEntry>(e => e.PostId == post.ID || e.ReblogOfPostId == post.ID);
-			if (!string.IsNullOrEmpty(post.AnsweringToPostId))
+			// boosts of it end with it, as on Mastodon, so no count keeps them
+			await DB.Default.Update<PostEntity>().Match(p => p.ReblogOfPostId == post.ID && !p.DeletedAt.HasValue)
+				.Modify(p => p.DeletedAt, DateTime.UtcNow).ExecuteAsync(token);
+			if (!string.IsNullOrEmpty(post.AnsweringToPostId) && Counted.Reply(post))
 				await DB.Default.Update<PostEntity>().MatchID(post.AnsweringToPostId).Modify(b => b.Inc(p => p.RepliesCount, -1)).ExecuteAsync(token);
+			await DB.Default.DeleteAsync<Models.Social.Pin>(p => p.PostId == post.ID);//a deleted post no longer takes a pin
 			if (audience.Count > 0)
 			{
 				var delete = ActivityPubRenderer.Delete(author, post.ObjectURI, $"delete-{post.ID}",
 					new JsonArray(post.To.Select(t => (JsonNode)t).ToArray()), new JsonArray(post.Cc.Select(c => (JsonNode)c).ToArray()));
-				await _delivery.Enqueue(author, audience, delete, token);
+				await _outbox.Publish(author, post, delete, token);//the post in hand still has its group and mentions
 				var group = string.IsNullOrEmpty(post.GroupId) ? default : await _localActors.FindById(LocalActorKind.Group, post.GroupId, token);
 				if (group is { IsCircle: false })
 					await _groups.Announce(group, delete, post.ObjectURI, isNewPost: false, token);

PrivaPub/Extensions/AddAuthExtension.cs

@@ -1,10 +1,7 @@
 using Microsoft.AspNetCore.Authentication;
-using Microsoft.IdentityModel.Tokens;
 
 using PrivaPub.Services;
 
-using System.Text;
-
 namespace PrivaPub.Extensions
 {
 	public static class AddAuthExtension
@@ -15,16 +12,7 @@ namespace PrivaPub.Extensions
 #if DEBUG
 				options.RequireHttpsMetadata = false;
 #endif
-				options.TokenValidationParameters = new()
+				options.TokenValidationParameters = RootJwt.Parameters(configuration);
-				{
-					ValidateIssuer = true,
-					ValidateAudience = true,
-					ValidateLifetime = true,
-					ValidateIssuerSigningKey = true,
-					ValidIssuer = configuration["AppConfiguration:Jwt:Issuer"],
-					ValidAudience = configuration["AppConfiguration:Jwt:Audience"],
-					IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["AppConfiguration:Jwt:Key"]))
-				};
 				options.Events = new JwtEvents();
 			});
 			return builder;

PrivaPub/Federation/Actors/AccountCountsJob.cs

@@ -0,0 +1,60 @@
+using MongoDB.Entities;
+
+using PrivaPub.Federation.Objects;
+using PrivaPub.Infrastructure.Http;
+using PrivaPub.Infrastructure.Jobs;
+using PrivaPub.Models.Jobs;
+using PrivaPub.Models.User;
+using PrivaPub.StaticServices;
+
+namespace PrivaPub.Federation.Actors
+{
+	// A remote account's follower, following and post counts, as its own server publishes them (the totalItems of its
+	// followers, following and outbox collections). Read when the account is fetched, at most once a day, never when
+	// someone looks at it; a hidden or missing collection leaves its count unknown. Mastodon and GoToSocial do the same.
+	public class AccountCountsJob : IJobHandler
+	{
+		readonly IRemoteActorService _remoteActors;
+		readonly DbEntities _dbEntities;
+
+		public AccountCountsJob(IRemoteActorService remoteActors, DbEntities dbEntities)
+		{
+			_remoteActors = remoteActors;
+			_dbEntities = dbEntities;
+		}
+
+		public JobKind Kind => JobKind.CountAccount;
+		public int Concurrency => 2;
+		public int MaxAttempts => 2;
+		public int PerHostLimit => 1;
+
+		public static string DedupeKey(string actorUri, DateTime day) => $"count|{actorUri}|{day:yyyyMMdd}";
+
+		public async Task<JobOutcome> Handle(Job job, CancellationToken token)
+		{
+			var actor = await _dbEntities.ForeignAvatars.Match(a => a.ActorURI == job.Payload && !a.DeletionAt.HasValue).ExecuteFirstAsync(token);
+			if (actor == default)
+				return JobOutcome.Done;
+			await DB.Default.Update<ForeignAvatar>().MatchID(actor.ID)
+				.Modify(a => a.FollowersCount, await Total(actor, actor.FollowersURL, token))
+				.Modify(a => a.FollowingCount, await Total(actor, actor.FollowingURL, token))
+				.Modify(a => a.StatusesCount, await Total(actor, actor.OutboxURL, token))
+				.Modify(a => a.CountedAt, DateTime.UtcNow)
+				.ExecuteAsync(token);
+			return JobOutcome.Done;
+		}
+
+		// only from the actor's own server, as everything we believe about it
+		async Task<int?> Total(ForeignAvatar actor, string collection, CancellationToken token)
+		{
+			if (string.IsNullOrEmpty(collection) || !Origin.Same(collection, actor.ActorURI))
+				return default;
+			using var scope = HttpScope.For("collection");
+			using var fetched = await _remoteActors.FetchObject(collection, token);
+			return fetched != default && fetched.Root.ValueKind == System.Text.Json.JsonValueKind.Object
+				&& fetched.Root.TryGetProperty("totalItems", out var total) && total.TryGetInt32(out var count) && count >= 0
+				? count
+				: default;
+		}
+	}
+}

PrivaPub/Federation/Actors/LocalActorService.cs

@@ -62,6 +62,7 @@ namespace PrivaPub.Federation.Actors
 	{
 		string BaseAddress { get; }
 		Task<LocalActor> FindByUserName(string userName, CancellationToken token);
+		Task<GoneActor> Gone(string userName, CancellationToken token);
 		Task<LocalActor> FindById(LocalActorKind kind, string id, CancellationToken token);
 		Task<LocalActor> FindByUri(string actorUri, CancellationToken token);
 		Task<LocalActor> GetInstanceActor(CancellationToken token);
@@ -71,6 +72,9 @@ namespace PrivaPub.Federation.Actors
 		LocalActor FromGroup(GroupEntity group);
 	}
 
+	// a persona or group that was deleted: its name stays reserved, and its documents answer 410 with this
+	public sealed record GoneActor(string Uri, string FormerType, DateTime DeletedAt);
+
 	public class LocalActorService : ILocalActorService
 	{
 		public const string InstanceUserName = "privapub";
@@ -113,6 +117,18 @@ namespace PrivaPub.Federation.Actors
 			return group == default ? default : FromGroup(group);
 		}
 
+		public async Task<GoneActor> Gone(string userName, CancellationToken token)
+		{
+			if (string.IsNullOrEmpty(userName))
+				return default;
+			userName = userName.ToLowerInvariant();
+			var avatar = await _dbEntities.Avatars.Match(a => a.UserName == userName && a.DeletionAt.HasValue).ExecuteFirstAsync(token);
+			if (avatar != default)
+				return new GoneActor($"{BaseAddress}/peasants/{avatar.UserName}", "Person", avatar.DeletionAt.Value);
+			var group = await _dbEntities.Groups.Match(g => g.UserName == userName && g.DeletionAt.HasValue).ExecuteFirstAsync(token);
+			return group == default ? default : new GoneActor($"{BaseAddress}/peasants/{group.UserName}", "Group", group.DeletionAt.Value);
+		}
+
 		public async Task<LocalActor> FindById(LocalActorKind kind, string id, CancellationToken token)
 		{
 			switch (kind)

PrivaPub/Federation/Actors/RemoteActorService.cs

@@ -36,9 +36,12 @@ namespace PrivaPub.Federation.Actors
 		readonly DbEntities _dbEntities;
 		readonly IOptionsMonitor<FederationOptions> _options;
 
+		readonly Infrastructure.Jobs.IJobQueue _jobs;
+
 		public RemoteActorService(IFederationHttp http, ILocalActorService localActors, IMemoryCache cache, DbEntities dbEntities,
-			IOptionsMonitor<FederationOptions> options = default)
+			IOptionsMonitor<FederationOptions> options = default, Infrastructure.Jobs.IJobQueue jobs = default)
 		{
+			_jobs = jobs;
 			_http = http;
 			_localActors = localActors;
 			_cache = cache;
@@ -89,7 +92,16 @@ namespace PrivaPub.Federation.Actors
 				return cached;
 
 			var key = cached == default ? default : actor.Key(cached.PublicKeyId);
-			return await Upsert(actor, key ?? actor.Keys.FirstOrDefault(), token);
+			return await Counted(await Upsert(actor, key ?? actor.Keys.FirstOrDefault(), token), token);
+		}
+
+		// its counts are read once a day, after it was fetched (AccountCountsJob)
+		async Task<ForeignAvatar> Counted(ForeignAvatar stored, CancellationToken token)
+		{
+			if (_jobs != default && stored is { DeletionAt: null } && Uri.TryCreate(stored.ActorURI, UriKind.Absolute, out var uri))
+				await _jobs.Enqueue(Models.Jobs.JobKind.CountAccount, stored.ActorURI, uri.Host.ToLowerInvariant(),
+					AccountCountsJob.DedupeKey(stored.ActorURI, DateTime.UtcNow), token);
+			return stored;
 		}
 
 		public async Task<ForeignAvatar> GetActorByKeyId(string keyId, bool refresh, CancellationToken token)
@@ -121,7 +133,7 @@ namespace PrivaPub.Federation.Actors
 			var key = actor?.Key(keyId);
 			if (key == default)
 				return default;
-			return await Upsert(actor, key, token);
+			return await Counted(await Upsert(actor, key, token), token);
 		}
 
 		public bool KeyTemporarilyUnavailable(string keyId) => Origin.Of(keyId) != default && _http.FailedTemporarily(StripFragment(keyId));

PrivaPub/Federation/Controllers/PeasantsController.cs

@@ -17,6 +17,7 @@ using PrivaPub.Domain.Privacy;
 using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Rendering;
 using PrivaPub.Federation.Inbox;
+using PrivaPub.Federation.Outbox;
 using PrivaPub.Federation.Signing;
 using PrivaPub.Infrastructure.Http;
 using PrivaPub.Models.Group;
@@ -52,6 +53,20 @@ namespace PrivaPub.Federation.Controllers
 		public async Task<IActionResult> GetActor(string actor, CancellationToken token)
 		{
 			var local = await _localActors.FindByUserName(actor, token);
+			if (local == default && await _localActors.Gone(actor, token) is { } gone)
+				return new ContentResult
+				{
+					Content = new JsonObject
+					{
+						["@context"] = ActivityPubRenderer.ActivityStreams,
+						["id"] = gone.Uri,
+						["type"] = "Tombstone",
+						["formerType"] = gone.FormerType,
+						["deleted"] = ActivityPubRenderer.Timestamp(gone.DeletedAt)
+					}.ToJsonString(),
+					ContentType = ActivityContentType,
+					StatusCode = StatusCodes.Status410Gone
+				};
 			if (local is not { IsFederated: true })
 				return NotFound();
 			if (WantsHtml() && local.Kind != LocalActorKind.Application)
@@ -69,9 +84,8 @@ namespace PrivaPub.Federation.Controllers
 
 			if (!page)
 			{
-				var total = local.Kind == LocalActorKind.Group
+				// as Mastodon's: statuses_count, though only public posts are listed
-					? await DB.Default.CountAsync<PostEntity>(f => f.Where(p => p.GroupId == local.Id) & f.Where(VisibilityPolicy.IsPublic), token)
+				var total = await Counted.PostsBy(local, token);
-					: await DB.Default.CountAsync<PostEntity>(f => f.Where(p => p.GroupUserId == local.Id && !p.IsFederatedCopy) & f.Where(VisibilityPolicy.IsPublic), token);
 				return Activity(ActivityPubRenderer.OrderedCollection(local.Outbox, (int)total, default, $"{local.Outbox}?page=true"));
 			}
 
@@ -87,7 +101,7 @@ namespace PrivaPub.Federation.Controllers
 			{
 				if (local.Kind == LocalActorKind.Group)
 				{
-					items.Add(ActivityPubRenderer.Announce(local, post.ObjectURI, $"announce-{post.ID}"));
+					items.Add(ActivityPubRenderer.Announce(local, post.ObjectURI, $"announce-{post.ID}", post.CreationDate));
 					continue;
 				}
 				if (post.ReblogOfPostId != default)
@@ -122,7 +136,13 @@ namespace PrivaPub.Federation.Controllers
 		public async Task<IActionResult> Following(string actor, CancellationToken token)
 		{
 			var local = await _localActors.FindByUserName(actor, token);
-			return local is not { IsFederated: true } ? NotFound() : Activity(ActivityPubRenderer.OrderedCollection(local.Following, 0, default));
+			if (local is not { IsFederated: true })
+				return NotFound();
+			// the count, as following_count says it; who is followed is never listed (FEDERATION.md)
+			var following = local.Kind == LocalActorKind.Person
+				? await DB.Default.CountAsync<Following>(f => f.AvatarId == local.Id && f.State == FollowState.Accepted, token)
+				: 0;
+			return Activity(ActivityPubRenderer.OrderedCollection(local.Following, (int)following, default));
 		}
 
 		[HttpGet, Route("{actor}/flock")]
@@ -185,11 +205,13 @@ namespace PrivaPub.Federation.Controllers
 		public async Task<IActionResult> Post(string actor, string postId, CancellationToken token)
 		{
 			var (local, post) = await PublicPost(actor, postId, token);
-			if (post == default && await CirclePost(actor, postId, token) is { } circlePost)
+			if (post == default && await SignedPost(actor, postId, token) is { } signed)
 			{
-				var circleNote = ActivityPubRenderer.Note(circlePost.Post, circlePost.Author, circlePost.Circle, circlePost.Post.InReplyToURI);
+				if (signed.Post.DeletedAt.HasValue)
-				circleNote["@context"] = ActivityPubRenderer.Context();
+					return TombstoneOf(signed.Author, signed.Post);
-				return Activity(circleNote);
+				var signedNote = (JsonObject)signed.Note.DeepClone();
+				signedNote["@context"] = ActivityPubRenderer.Context();
+				return Activity(signedNote);
 			}
 			if (post == default)
 				return await Tombstone(actor, postId, token) ?? NotFound();
@@ -236,20 +258,55 @@ namespace PrivaPub.Federation.Controllers
 			{
 				var booster = await _localActors.FindByUserName(actor, token);
 				var uri = booster?.ActivityUri(activityId);
+				if (booster is { Kind: LocalActorKind.Group, IsCircle: false })
+					return await GroupAnnounce(booster, activityId, uri, token);
 				var reblog = uri == default ? default : await _dbEntities.Posts.Match(p => p.ObjectURI == uri && !p.DeletedAt.HasValue).ExecuteFirstAsync(token);
 				var rendered = reblog == default ? default : await AnnounceFor(reblog, token);
+				if (rendered != default && WantsHtml() && await _dbEntities.Posts.MatchID(reblog.ReblogOfPostId).ExecuteFirstAsync(token) is { } boosted)
+					return Redirect(boosted.Url ?? boosted.ObjectURI);//a boost has no page of its own: the boosted post's
 				return rendered == default ? NotFound() : Activity(rendered);
 			}
 			if (!activityId.StartsWith("create-", StringComparison.Ordinal))
 				return NotFound();
 			var (local, post) = await PublicPost(actor, activityId["create-".Length..], token);
-			return post == default ? NotFound() : Activity(await CreateFor(post, local, token));
+			if (post != default)
+				return Activity(await CreateFor(post, local, token));
+			return await SignedPost(actor, activityId["create-".Length..], token) is { Post.DeletedAt: null } signed
+				? Activity(ActivityPubRenderer.Create(signed.Author, (JsonObject)signed.Note.DeepClone(), activityId))
+				: NotFound();
+		}
+
+		// A DM's `context`: the conversation's posts, for its participants (or their servers' instance actors) only.
+		[HttpGet, Route("{actor}/whispers/{conversationId}")]
+		public async Task<IActionResult> Whispers(string actor, string conversationId, CancellationToken token)
+		{
+			var local = await _localActors.FindByUserName(actor, token);
+			if (local is not { IsFederated: true, Kind: LocalActorKind.Person })
+				return NotFound();
+			var uri = local.ConversationUri(conversationId);
+			var conversation = await _dbEntities.DmGroups.Match(g => g.ID == conversationId && g.ConversationURI == uri && !g.DeletionAt.HasValue).ExecuteFirstAsync(token);
+			if (conversation == default || !SignedFetchAuthorizer.MayReadConversation(conversation, await _fetches.Requester(Request, token)))
+				return NotFound();
+			var posts = await _dbEntities.Posts
+				.Match(p => p.ConversationId == conversationId && p.Visibility == PostVisibility.Direct && !p.DeletedAt.HasValue)
+				.Sort(p => p.CreationDate, Order.Ascending)
+				.ExecuteAsync(token);
+			return Activity(new JsonObject
+			{
+				["@context"] = ActivityPubRenderer.ActivityStreams,
+				["id"] = uri,
+				["type"] = "OrderedCollection",
+				["totalItems"] = posts.Count,
+				["orderedItems"] = new JsonArray(posts.Select(p => (JsonNode)p.ObjectURI).ToArray())
+			});
 		}
 
 		[HttpPost, Route("{actor}/mouth"), EnableRateLimiting(RateLimiting.Inbox)]
 		public async Task<IActionResult> Inbox(string actor, CancellationToken token)
 		{
 			var local = await _localActors.FindByUserName(actor, token);
+			if (local == default && await _localActors.Gone(actor, token) != default)
+				return StatusCode(StatusCodes.Status410Gone);
 			if (local is not { IsFederated: true })
 				return Answer(_inbox.NoSuchRecipient(Request));
 			return Answer(await _inbox.Receive(Request, local, token));
@@ -275,18 +332,37 @@ namespace PrivaPub.Federation.Controllers
 			return (local, post);
 		}
 
-		async Task<(LocalActor Author, LocalActor Circle, PostEntity Post)?> CirclePost(string actor, string postId, CancellationToken token)
+		// A followers-only, direct or circle post (deleted ones included), for a signed request from someone it was for
+		// (SignedFetchAuthorizer.MayRead). It is rendered as it was delivered: a circle post also names, in cc, the requesting
+		// member, or the members on the requesting instance actor's server.
+		async Task<(LocalActor Author, PostEntity Post, JsonObject Note)?> SignedPost(string actor, string postId, CancellationToken token)
 		{
 			var local = await _localActors.FindByUserName(actor, token);
-			if (local is not { Kind: LocalActorKind.Person })
+			if (local is not { IsFederated: true, Kind: LocalActorKind.Person })
 				return default;
 			var post = await _dbEntities.Posts
-				.Match(p => p.ID == postId && p.GroupUserId == local.Id && !p.IsFederatedCopy && !p.DeletedAt.HasValue && p.Visibility == PostVisibility.Circle)
+				.Match(p => p.ID == postId && p.GroupUserId == local.Id && !p.IsFederatedCopy && p.ReblogOfPostId == null
+					&& (p.Visibility == PostVisibility.FollowersOnly || p.Visibility == PostVisibility.Direct || p.Visibility == PostVisibility.Circle))
 				.ExecuteFirstAsync(token);
-			var circle = post == default ? default : await _dbEntities.Groups.MatchID(post.GroupId).ExecuteFirstAsync(token);
+			if (post == default)
-			if (circle == default || !SignedFetchAuthorizer.MayReadCircle(circle, await _fetches.Requester(Request, token)))
 				return default;
-			return (local, _localActors.FromGroup(circle), post);
+			var requester = await _fetches.Requester(Request, token);
+			if (!await _fetches.MayRead(post, requester, token))
+				return default;
+			if (post.Visibility == PostVisibility.Circle)
+			{
+				var circle = await _dbEntities.Groups.MatchID(post.GroupId).ExecuteFirstAsync(token);
+				var note = ActivityPubRenderer.Note(post, local, _localActors.FromGroup(circle), post.InReplyToURI);
+				var readers = SignedFetchAuthorizer.CircleReaders(circle, requester);
+				var named = readers.Count == 0 ? new List<Models.User.ForeignAvatar>() : await _dbEntities.ForeignAvatars.Match(a => readers.Contains(a.ActorURI)).ExecuteAsync(token);
+				return (local, post, OutboxPublisher.Naming(note, named));
+			}
+			var rendered = post.Visibility == PostVisibility.Direct
+				? ActivityPubRenderer.DirectNote(post, local, Array.Empty<(string, string)>(), post.ContextURI)
+				: ActivityPubRenderer.Note(post, local, default, post.InReplyToURI);
+			rendered["to"] = new JsonArray(post.To.Select(t => (JsonNode)t).ToArray());
+			rendered["cc"] = new JsonArray(post.Cc.Select(c => (JsonNode)c).ToArray());
+			return (local, post, rendered);
 		}
 
 		async Task<IActionResult> Tombstone(string actor, string postId, CancellationToken token)
@@ -298,8 +374,11 @@ namespace PrivaPub.Federation.Controllers
 				.Match(p => p.ID == postId && p.GroupUserId == local.Id && !p.IsFederatedCopy && p.DeletedAt.HasValue
 					&& (p.Visibility == PostVisibility.Public || p.Visibility == PostVisibility.Unlisted))
 				.ExecuteFirstAsync(token);
-			if (deleted == default)
+			return deleted == default ? default : TombstoneOf(local, deleted);
-				return default;
+		}
+
+		ContentResult TombstoneOf(LocalActor local, PostEntity deleted)
+		{
 			var tombstone = new JsonObject
 			{
 				["@context"] = ActivityPubRenderer.ActivityStreams,
@@ -311,6 +390,24 @@ namespace PrivaPub.Federation.Controllers
 			return new ContentResult { Content = tombstone.ToJsonString(), ContentType = ActivityContentType, StatusCode = StatusCodes.Status410Gone };
 		}
 
+		// A community's announce: one GroupDistributor sent (kept as sent), or one its outbox lists (announce-{postId}),
+		// while the post it is about is still shown; 410 once that post is gone.
+		async Task<IActionResult> GroupAnnounce(LocalActor group, string activityId, string uri, CancellationToken token)
+		{
+			if (await DB.Default.Find<GroupAnnouncement>().Match(a => a.ActivityURI == uri && a.GroupId == group.Id).ExecuteFirstAsync(token) is { } kept)
+			{
+				var about = await _dbEntities.Posts.Match(p => p.ObjectURI == kept.ObjectURI).ExecuteFirstAsync(token);
+				if (!VisibilityPolicy.Shown(about) || about.Visibility is not (PostVisibility.Public or PostVisibility.Unlisted))
+					return StatusCode(StatusCodes.Status410Gone);
+				var body = JsonNode.Parse(kept.Body)!.AsObject();
+				body["@context"] = ActivityPubRenderer.Context();
+				return Activity(body);
+			}
+			var postId = activityId["announce-".Length..];
+			var post = await _dbEntities.Posts.Match(p => p.ID == postId && p.GroupId == group.Id).Match(VisibilityPolicy.IsPublic).ExecuteFirstAsync(token);
+			return post == default ? NotFound() : Activity(ActivityPubRenderer.Announce(group, post.ObjectURI, activityId, post.CreationDate));
+		}
+
 		async Task<JsonObject> AnnounceFor(PostEntity reblog, CancellationToken token)
 		{
 			var original = await _dbEntities.Posts.MatchID(reblog.ReblogOfPostId).ExecuteFirstAsync(token);
@@ -349,7 +446,9 @@ namespace PrivaPub.Federation.Controllers
 		{
 			if (HttpMethods.IsGet(Request.Method))
 				Response.Headers.Vary = "Accept";
-			if (_federation.CurrentValue.SecureMode && HttpMethods.IsGet(Request.Method)
+			// SecureMode asks every reader of ActivityPub documents for a signature, except for the instance actor, whose key
+			// peers need first, and except for browsers, which only get redirected to the public pages
+			if (_federation.CurrentValue.SecureMode && HttpMethods.IsGet(Request.Method) && !WantsHtml()
 				&& !string.Equals(context.RouteData.Values["actor"] as string, LocalActorService.InstanceUserName, StringComparison.OrdinalIgnoreCase)
 				&& await _fetches.Requester(Request, HttpContext.RequestAborted) == default)
 			{

PrivaPub/Federation/Controllers/WellKnownController.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.Mvc;
+using Microsoft.Extensions.Options;
 
 using MongoDB.Entities;
 
@@ -12,6 +13,7 @@ using System.Text.Json.Nodes;
 using PostEntity = PrivaPub.Models.Post.Post;
 using PrivaPub.Domain.Privacy;
 using PrivaPub.Federation.Actors;
+using PrivaPub.Infrastructure;
 
 namespace PrivaPub.Federation.Controllers
 {
@@ -20,9 +22,11 @@ namespace PrivaPub.Federation.Controllers
 	{
 		readonly ILocalActorService _localActors;
 		readonly DbEntities _dbEntities;
+		readonly IOptionsMonitor<RegistrationOptions> _registrations;
 
-		public WellKnownController(ILocalActorService localActors, DbEntities dbEntities)
+		public WellKnownController(ILocalActorService localActors, DbEntities dbEntities, IOptionsMonitor<RegistrationOptions> registrations)
 		{
+			_registrations = registrations;
 			_localActors = localActors;
 			_dbEntities = dbEntities;
 		}
@@ -45,6 +49,8 @@ namespace PrivaPub.Federation.Controllers
 				if (parts.Length != 2 || !parts[1].Equals(domain, StringComparison.OrdinalIgnoreCase))
 					return NotFound();
 				actor = await _localActors.FindByUserName(parts[0], token);
+				if (actor == default && await _localActors.Gone(parts[0], token) != default)
+					return StatusCode(StatusCodes.Status410Gone);
 			}
 			else
 				actor = await _localActors.FindByUri(resource, token);
@@ -88,8 +94,8 @@ namespace PrivaPub.Federation.Controllers
 		[HttpGet, Route("/nodeinfo/{version:regex(^2\\.[[01]]$)}")]
 		public async Task<IActionResult> NodeInfo(string version, CancellationToken token)
 		{
-			var users = await DB.Default.CountAsync<Avatar>(a => !a.DeletionAt.HasValue, token);
+			var users = await Counted.Users(token);
-			var posts = await DB.Default.CountAsync<PostEntity>(f => f.Where(p => !p.IsFederatedCopy && p.ReblogOfPostId == null) & f.Where(VisibilityPolicy.IsPublic), token);
+			var posts = await Counted.LocalPosts(token);
 			var software = new JsonObject { ["name"] = "privapub", ["version"] = BuildInfo.Ref };
 			if (version == "2.1")
 			{
@@ -102,10 +108,15 @@ namespace PrivaPub.Federation.Controllers
 				["software"] = software,
 				["protocols"] = new JsonArray("activitypub"),
 				["services"] = new JsonObject { ["inbound"] = new JsonArray(), ["outbound"] = new JsonArray() },
-				["openRegistrations"] = true,
+				["openRegistrations"] = _registrations.CurrentValue.IsOpen,
 				["usage"] = new JsonObject
 				{
-					["users"] = new JsonObject { ["total"] = users },
+					["users"] = new JsonObject
+					{
+						["total"] = users,
+						["activeMonth"] = await Counted.ActiveUsers(30, token),
+						["activeHalfyear"] = await Counted.ActiveUsers(180, token)
+					},
 					["localPosts"] = posts
 				},
 				["metadata"] = new JsonObject

PrivaPub/Federation/Inbox/GoneActors.cs

@@ -0,0 +1,63 @@
+using MongoDB.Entities;
+
+using PrivaPub.Domain.Privacy;
+using PrivaPub.Models.Post;
+using PrivaPub.Models.Social;
+using PrivaPub.Models.User;
+
+using PostEntity = PrivaPub.Models.Post.Post;
+
+namespace PrivaPub.Federation.Inbox
+{
+	// A remote account that deleted itself keeps its posts, hidden (owner decision 2026-10-03), but leaves nothing in our
+	// numbers: its likes, downvotes, reactions and poll votes go, and the counters they had moved come back, as do the
+	// reblog, reply and quote counts its own posts had added. Its notifications go too. ForgottenAt makes it run once.
+	public static class GoneActors
+	{
+		public static async Task Forget(ForeignAvatar actor, CancellationToken token)
+		{
+			if (actor == default || actor.ForgottenAt.HasValue)
+				return;
+			var uri = actor.ActorURI;
+
+			foreach (var like in await DB.Default.Find<Favourite>().Match(f => f.ActorURI == uri).ExecuteAsync(token))
+			{
+				await DB.Default.Update<PostEntity>().MatchID(like.PostId).Modify(b => b.Inc(p => p.FavouritesCount, -1)).ExecuteAsync(token);
+				await DB.Default.DeleteAsync<Favourite>(like.ID);
+			}
+			foreach (var down in await DB.Default.Find<Downvote>().Match(d => d.ActorURI == uri).ExecuteAsync(token))
+			{
+				await DB.Default.Update<PostEntity>().MatchID(down.PostId).Modify(b => b.Inc(p => p.DownvotesCount, -1)).ExecuteAsync(token);
+				await DB.Default.DeleteAsync<Downvote>(down.ID);
+			}
+			await DB.Default.DeleteAsync<Reaction>(r => r.ActorURI == uri);
+			foreach (var ballot in (await DB.Default.Find<PollVote>().Match(v => v.ActorURI == uri).ExecuteAsync(token)).GroupBy(v => v.PostId))
+			{
+				var poll = await DB.Default.Find<PostEntity>().MatchID(ballot.Key).ExecuteFirstAsync(token);
+				if (poll?.Poll != default)
+				{
+					var update = DB.Default.Update<PostEntity>().MatchID(poll.ID);
+					foreach (var vote in ballot.Where(v => v.Choice >= 0 && v.Choice < poll.Poll.Options.Count))
+						update = update.Modify(b => b.Inc($"{nameof(PostEntity.Poll)}.{nameof(PostPoll.Options)}.{vote.Choice}.{nameof(PollOption.Votes)}", -1));
+					if (poll.Poll.VotersCount.HasValue)
+						update = update.Modify(b => b.Inc($"{nameof(PostEntity.Poll)}.{nameof(PostPoll.VotersCount)}", -1));
+					await update.ExecuteAsync(token);
+				}
+				await DB.Default.DeleteAsync<PollVote>(v => v.PostId == ballot.Key && v.ActorURI == uri);
+			}
+
+			foreach (var post in await DB.Default.Find<PostEntity>().Match(p => p.ActorURI == uri && !p.DeletedAt.HasValue).ExecuteAsync(token))
+			{
+				if (!string.IsNullOrEmpty(post.ReblogOfPostId))
+					await DB.Default.Update<PostEntity>().MatchID(post.ReblogOfPostId).Modify(b => b.Inc(p => p.ReblogsCount, -1)).ExecuteAsync(token);
+				if (!string.IsNullOrEmpty(post.AnsweringToPostId) && Counted.Reply(post))
+					await DB.Default.Update<PostEntity>().MatchID(post.AnsweringToPostId).Modify(b => b.Inc(p => p.RepliesCount, -1)).ExecuteAsync(token);
+				if (!string.IsNullOrEmpty(post.QuotedPostId) && post.QuoteState == QuoteState.Accepted)
+					await DB.Default.Update<PostEntity>().MatchID(post.QuotedPostId).Modify(b => b.Inc(p => p.QuotesCount, -1)).ExecuteAsync(token);
+			}
+
+			await DB.Default.DeleteAsync<Notification>(n => n.FromActorURI == uri);
+			await DB.Default.Update<ForeignAvatar>().MatchID(actor.ID).Modify(a => a.ForgottenAt, DateTime.UtcNow).ExecuteAsync(token);
+		}
+	}
+}

PrivaPub/Federation/Inbox/Handlers/CreateHandler.cs

@@ -182,7 +182,7 @@ namespace PrivaPub.Federation.Inbox.Handlers
 			await _previews.Wanted(post, token);
 			await _quotes.Resolve(post, note, token);
 
-			if (parent != default)
+			if (parent != default && Domain.Privacy.Counted.Reply(post))
 				await DB.Default.Update<PostEntity>().MatchID(parent.ID).Modify(b => b.Inc(p => p.RepliesCount, 1)).ExecuteAsync(token);
 			await _fanout.Distribute(post, token);
 			if (conversation != default)

PrivaPub/Federation/Inbox/Handlers/DeleteHandler.cs

@@ -71,6 +71,7 @@ namespace PrivaPub.Federation.Inbox.Handlers
 				await DB.Default.DeleteAsync<Following>(f => f.TargetActorURI == actor.ActorURI);
 				await DB.Default.DeleteAsync<TimelineEntry>(e => e.AuthorAccountId == actor.ID);
 				await DB.Default.Update<PostEntity>().Match(p => p.ActorURI == actor.ActorURI).Modify(p => p.AuthorGone, true).ExecuteAsync(token);
+				await GoneActors.Forget(actor, token);
 				return;
 			}
 

PrivaPub/Federation/Inbox/RemoteEdits.cs

@@ -1,4 +1,4 @@
-using MongoDB.Entities;
+using MongoDB.Entities;
 
 using PrivaPub.Domain.Statuses;
 using PrivaPub.Federation.Actors;
@@ -15,8 +15,15 @@ namespace PrivaPub.Federation.Inbox
 	{
 		public const int MaxRevisions = 20;
 
+		//newer than what we hold; or, for a first edit, no older and actually different, because GoToSocial's timestamps are
+		//whole seconds and an edit made in the second the post was published carries updated == published
 		public static bool IsEdit(NoteDocument note, PostEntity post) =>
-			note.Updated is { } updated && updated > (post.EditedAt ?? post.CreationDate);
+			note.Updated is { } updated
+			&& (updated > (post.EditedAt ?? post.CreationDate)
+				|| post.EditedAt == default && updated >= post.CreationDate && Changed(note, post));
+
+		static bool Changed(NoteDocument note, PostEntity post) =>
+			note.ContentHtml != post.ContentHtml || note.SpoilerText != post.SpoilerText || note.Title != post.Title || note.Sensitive != post.HasContentWarning;
 
 		public static async Task<bool> Apply(PostEntity post, NoteDocument note, string activityId, ILocalActorService localActors, IObjectRecords records,
 			IQuoteService quotes, CancellationToken token)
@@ -26,6 +33,7 @@ namespace PrivaPub.Federation.Inbox
 			post.Video = note.Video ?? post.Video;
 			post.Audio = note.Audio ?? post.Audio;
 			post.Event = note.Event ?? post.Event;
+			post.Place = note.Place;
 			if (!IsEdit(note, post))
 			{
 				await DB.Default.SaveAsync(post, token);
@@ -97,7 +105,7 @@ namespace PrivaPub.Federation.Inbox
 			await DB.Default.DeleteAsync<ObjectRecord>(r => r.PostId == post.ID || r.ObjectURI == objectUri);
 			await DB.Default.DeleteAsync<TimelineEntry>(e => e.PostId == post.ID || e.ReblogOfPostId == post.ID);
 			await DB.Default.DeleteAsync<PostEntity>(p => p.ReblogOfPostId == post.ID);
-			if (!string.IsNullOrEmpty(post.AnsweringToPostId))
+			if (!string.IsNullOrEmpty(post.AnsweringToPostId) && Domain.Privacy.Counted.Reply(post))
 				await DB.Default.Update<PostEntity>().MatchID(post.AnsweringToPostId).Modify(b => b.Inc(p => p.RepliesCount, -1)).ExecuteAsync(token);
 			if (post.QuoteState == QuoteState.Accepted && !string.IsNullOrEmpty(post.QuotedPostId))
 				await DB.Default.Update<PostEntity>().MatchID(post.QuotedPostId).Modify(b => b.Inc(p => p.QuotesCount, -1)).ExecuteAsync(token);

PrivaPub/Federation/Inbox/RemotePosts.cs

@@ -1,4 +1,4 @@
-using MongoDB.Driver;
+using MongoDB.Driver;
 using MongoDB.Entities;
 
 using PrivaPub.Infrastructure.Http;
@@ -90,6 +90,7 @@ namespace PrivaPub.Federation.Inbox
 				Video = note.Video,
 				Audio = note.Audio,
 				Event = note.Event,
+				Place = note.Place,
 				HasContentWarning = note.Sensitive,
 				Text = note.ContentHtml,
 				ContentHtml = note.ContentHtml,

PrivaPub/Federation/Objects/InstanceDescriber.cs

@@ -1,4 +1,4 @@
-using MongoDB.Entities;
+using MongoDB.Entities;
 
 using PrivaPub.Infrastructure.Geo;
 using PrivaPub.Infrastructure.Http;
@@ -18,12 +18,17 @@ namespace PrivaPub.Federation.Objects
 		readonly IFederationHttp _http;
 		readonly IGeoLocator _geo;
 		readonly IConnectedAddresses _addresses;
+		readonly ICdnRanges _cdnRanges;
+		readonly IEdgeHints _edges;
 
-		public InstanceDescriber(IFederationHttp http, IGeoLocator geo = default, IConnectedAddresses addresses = default)
+		public InstanceDescriber(IFederationHttp http, IGeoLocator geo = default, IConnectedAddresses addresses = default, ICdnRanges cdnRanges = default,
+			IEdgeHints edges = default)
 		{
 			_http = http;
 			_geo = geo;
 			_addresses = addresses;
+			_cdnRanges = cdnRanges;
+			_edges = edges;
 		}
 
 		public JobKind Kind => JobKind.DescribeInstance;
@@ -145,35 +150,57 @@ namespace PrivaPub.Federation.Objects
 				.Modify(s => s.RegistrationMode, instance?.RegistrationMode)
 				.Modify(s => s.Languages, instance?.Languages)
 				.Modify(s => s.Country, instance?.Geo?.Country)
+				.Modify(s => s.City, instance?.Geo?.City)
+				.Modify(s => s.Latitude, instance?.Geo?.Latitude)
+				.Modify(s => s.Longitude, instance?.Geo?.Longitude)
 				.Modify(s => s.Asn, instance?.Geo?.Asn)
 				.Modify(s => s.Cdn, instance?.Geo?.Cdn)
+				.Modify(s => s.CdnDomain, instance?.Geo?.CdnDomain)
+				.Modify(s => s.CdnSource, instance?.Geo?.CdnSource)
 				.Modify(s => s.Ipv6, instance?.Geo?.Ipv6)
 				.Option(o => o.IsUpsert = true)
 				.ExecuteAsync(token);
 			return facts != default;
 		}
 
+		// Where the address we reached sits, and the CDN in front of it, found by its published ranges, then by the
+		// fingerprint in the responses we just got, then by a network that carries only a CDN.
 		InstanceGeo Locate(string host)
 		{
-			var reached = _addresses?.Of(new Uri(Address($"https://{host}/")).Host);
+			var reachedHost = new Uri(Address($"https://{host}/")).Host;
+			var reached = _addresses?.Of(reachedHost);
 			var fix = reached == default ? default : _geo?.Locate(reached);
-			if (fix == default)
+			var (cdn, cdnSource) = Cdn(reached, reachedHost, fix?.Asn, _cdnRanges, _edges);
+			if (fix == default && cdn == default)
 				return default;
 			return new InstanceGeo
 			{
-				Country = fix.Country,
+				Country = fix?.Country,
-				City = fix.City,
+				City = fix?.City,
-				Latitude = fix.Latitude,
+				Latitude = fix?.Latitude,
-				Longitude = fix.Longitude,
+				Longitude = fix?.Longitude,
-				Asn = fix.Asn,
+				Asn = fix?.Asn,
-				AsnOrg = fix.AsnOrg,
+				AsnOrg = fix?.AsnOrg,
-				Cdn = CdnNetworks.Of(fix.Asn),
+				Cdn = cdn?.Name,
-				Ipv6 = reached.AddressFamily == AddressFamily.InterNetworkV6,
+				CdnDomain = cdn?.Domain,
-				Source = _geo.Source,
+				CdnSource = cdnSource,
+				Ipv6 = reached?.AddressFamily == AddressFamily.InterNetworkV6,
+				Source = _geo?.Source,
 				LocatedAt = DateTime.UtcNow
 			};
 		}
 
+		public static (CdnProvider Cdn, string Source) Cdn(System.Net.IPAddress address, string host, int? asn, ICdnRanges ranges, IEdgeHints edges)
+		{
+			if (ranges?.Of(address) is { } listed)
+				return (listed, "ranges");
+			if (edges?.Of(host) is { } hinted)
+				return (hinted, "headers");
+			if (CdnCatalog.OfAsn(asn) is { } network)
+				return (network, "asn");
+			return default;
+		}
+
 		//where an https address is fetched from: itself, except in tests, which point it at a plain-http peer
 		protected virtual string Address(string url) => url;
 	}

PrivaPub/Federation/Objects/NoteParser.cs

@@ -1,4 +1,4 @@
-using PrivaPub.Models.Post;
+using PrivaPub.Models.Post;
 
 using System.Globalization;
 using System.Text;
@@ -44,6 +44,7 @@ namespace PrivaPub.Federation.Objects
 		public VideoDetails Video { get; init; }
 		public AudioDetails Audio { get; init; }
 		public EventDetails Event { get; init; }
+		public PostPlace Place { get; init; }
 	}
 
 	public static class NoteParser
@@ -110,7 +111,8 @@ namespace PrivaPub.Federation.Objects
 				Link = ObjectShapes.Link(note),
 				Video = ObjectShapes.Video(note),
 				Audio = ObjectShapes.Audio(note),
-				Event = ObjectShapes.Event(note)
+				Event = ObjectShapes.Event(note),
+				Place = ObjectShapes.NotePlace(note)
 			};
 		}
 

PrivaPub/Federation/Objects/ObjectShapes.cs

@@ -1,4 +1,4 @@
-using PrivaPub.Models.Post;
+using PrivaPub.Models.Post;
 
 using System.Globalization;
 using System.Net;
@@ -137,11 +137,18 @@ namespace PrivaPub.Federation.Objects
 				JsonValue value when value.TryGetValue<string>(out var at) => Moment(at),
 				_ => default
 			};
+			var expiresAt = Moment(Value(note, "endTime"));
+			// Pleroma and Akkoma put an open poll's end in `closed`, often without `endTime`: it is closed once that has passed
+			if (closedAt > DateTime.UtcNow)
+			{
+				expiresAt ??= closedAt;
+				closedAt = default;
+			}
 			return new PostPoll
 			{
 				Options = options,
 				Multiple = multiple,
-				ExpiresAt = Moment(Value(note, "endTime")),
+				ExpiresAt = expiresAt,
 				ClosedAt = closedAt,
 				VotersCount = Int(note, "votersCount")
 			};
@@ -286,6 +293,31 @@ namespace PrivaPub.Federation.Objects
 			};
 		}
 
+		//a post's own place, as Pixelfed sends it: a Place with coordinates (numbers, or numbers as strings); an Event's
+		//places are its own (Event)
+		public static PostPlace NotePlace(JsonObject note)
+		{
+			if (Value(note, "type") == "Event")
+				return default;
+			var place = Objects(note["location"]).FirstOrDefault(l => Value(l, "type") == "Place");
+			var latitude = Coordinate(place, "latitude");
+			var longitude = Coordinate(place, "longitude");
+			if (latitude is not (>= -90 and <= 90) || longitude is not (>= -180 and <= 180))
+				return default;
+			return new PostPlace
+			{
+				Name = Text(Value(place, "name"), 200),
+				Latitude = Math.Round(latitude.Value, 4),
+				Longitude = Math.Round(longitude.Value, 4),
+				Country = Text(Value(place, "country"), 100)
+			};
+		}
+
+		static double? Coordinate(JsonObject node, string property) =>
+			Double(node, property) ?? (double.TryParse(Value(node, property), NumberStyles.Float, CultureInfo.InvariantCulture, out var number) && double.IsFinite(number)
+				? number
+				: (double?)null);
+
 		static EventPlace Place(JsonObject location)
 		{
 			var type = Value(location, "type");

PrivaPub/Federation/Outbox/GroupDistributor.cs

@@ -1,5 +1,8 @@
+using MongoDB.Entities;
+
 using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Rendering;
+using PrivaPub.Models.Federation;
 
 using System.Security.Cryptography;
 using System.Text;
@@ -14,6 +17,26 @@ namespace PrivaPub.Federation.Outbox
 
 	public class GroupDistributor : IGroupDistributor
 	{
+		// so the announce's id resolves (PeasantsController.Grunt); a repeat of the same announce keeps the first
+		static async Task Keep(LocalActor group, JsonObject announce, string objectUri, CancellationToken token)
+		{
+			var body = (JsonObject)announce.DeepClone();
+			body.Remove("@context");
+			try
+			{
+				await DB.Default.SaveAsync(new GroupAnnouncement
+				{
+					GroupId = group.Id,
+					ActivityURI = body["id"]!.GetValue<string>(),
+					ObjectURI = objectUri,
+					Body = body.ToJsonString()
+				}, token);
+			}
+			catch (MongoDB.Driver.MongoWriteException ex) when (ex.WriteError?.Category == MongoDB.Driver.ServerErrorCategory.DuplicateKey)
+			{
+			}
+		}
+
 		readonly IDeliveryService _delivery;
 
 		public GroupDistributor(IDeliveryService delivery)
@@ -40,9 +63,16 @@ namespace PrivaPub.Federation.Outbox
 				["audience"] = group.Uri,
 				["object"] = embedded
 			};
+			// Every follower, the author's own server included: Lemmy 1.0 keeps its user's post pending until the community
+			// announces it back, and clears that before it answers the echo 400 ("Object is not remote").
 			await _delivery.EnqueueToFollowers(group, announce, token);
+			await Keep(group, announce, objectUri, token);
 			if (isNewPost && !string.IsNullOrEmpty(objectUri))
-				await _delivery.EnqueueToFollowers(group, ActivityPubRenderer.Announce(group, objectUri, $"announce-object-{key}"), token);
+			{
+				var boost = ActivityPubRenderer.Announce(group, objectUri, $"announce-object-{key}");
+				await _delivery.EnqueueToFollowers(group, boost, token);
+				await Keep(group, boost, objectUri, token);
+			}
 		}
 	}
 }

PrivaPub/Federation/Outbox/OutboxPublisher.cs

@@ -2,6 +2,7 @@ using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Rendering;
 using PrivaPub.Models.Federation;
 using PrivaPub.Models.Post;
+using PrivaPub.Models.User;
 using PrivaPub.StaticServices;
 
 using System.Text.Json.Nodes;
@@ -14,6 +15,7 @@ namespace PrivaPub.Federation.Outbox
 	{
 		Task<IReadOnlyList<string>> Audience(LocalActor author, PostEntity post, CancellationToken token);
 		Task Publish(LocalActor author, PostEntity post, JsonObject activity, CancellationToken token);
+		Task PublishUpdate(LocalActor author, PostEntity post, string reason, CancellationToken token);
 		Task PublishProfile(LocalActor actor, CancellationToken token);
 	}
 
@@ -73,25 +75,79 @@ namespace PrivaPub.Federation.Outbox
 			return inboxes.Where(i => !string.IsNullOrEmpty(i)).Distinct(StringComparer.Ordinal).ToList();
 		}
 
-		async Task<IReadOnlyList<string>> CircleMembers(string groupId, CancellationToken token)
+		async Task<IReadOnlyList<string>> CircleMembers(string groupId, CancellationToken token) =>
+			(await CircleRecipients(groupId, token)).Select(r => r.InboxURL).Distinct(StringComparer.Ordinal).ToList();
+
+		async Task<IReadOnlyList<ForeignAvatar>> CircleRecipients(string groupId, CancellationToken token)
 		{
 			var circle = string.IsNullOrEmpty(groupId) ? default : await _dbEntities.Groups.MatchID(groupId).ExecuteFirstAsync(token);
 			if (circle == default)
-				return Array.Empty<string>();
+				return Array.Empty<ForeignAvatar>();
 			var remote = circle.Members.Where(m => m.IsForeign).Select(m => m.AvatarId).ToList();
 			if (remote.Count == 0)
-				return Array.Empty<string>();
+				return Array.Empty<ForeignAvatar>();
 			return (await _dbEntities.ForeignAvatars.Match(a => remote.Contains(a.ActorURI)).ExecuteAsync(token))
-				.Select(a => a.InboxURL).Where(i => !string.IsNullOrEmpty(i)).Distinct(StringComparer.Ordinal).ToList();
+				.Where(a => !string.IsNullOrEmpty(a.InboxURL))
+				.ToList();
 		}
 
 		public async Task Publish(LocalActor author, PostEntity post, JsonObject activity, CancellationToken token)
 		{
+			if (post.Visibility == PostVisibility.Circle)
+			{
+				foreach (var member in await CircleRecipients(post.GroupId, token))
+					await _delivery.Enqueue(author, new[] { member.InboxURL }, Naming(activity, new[] { member }), token);
+				return;
+			}
 			var inboxes = await Audience(author, post, token);
 			if (inboxes.Count > 0)
 				await _delivery.Enqueue(author, inboxes, activity, token);
 		}
 
+		public async Task PublishUpdate(LocalActor author, PostEntity post, string reason, CancellationToken token)
+		{
+			var group = string.IsNullOrEmpty(post.GroupId) ? default : await _localActors.FindById(LocalActorKind.Group, post.GroupId, token);
+			await Publish(author, post, ActivityPubRenderer.UpdateOf(post, author, group, reason), token);
+		}
+
+		// Mastodon keeps a post only when it names one of its own accounts, and GoToSocial shows a post that is neither
+		// public nor for followers only to the accounts it mentions; a circle post names only the circle. So each member's
+		// copy, or a member's refetch, also names that member in cc and mentions them, silently, in its tags (owner decision
+		// 2026-10-04): it tells each member nothing but that they are in the circle.
+		public static JsonObject Naming(JsonObject activityOrObject, IEnumerable<ForeignAvatar> members)
+		{
+			var named = members.ToList();
+			var copy = (JsonObject)activityOrObject.DeepClone();
+			if (copy["object"] is JsonObject inner)
+			{
+				Name(copy, named, mention: false);
+				if (inner.ContainsKey("to"))
+					Name(inner, named, mention: true);
+			}
+			else
+				Name(copy, named, mention: copy.ContainsKey("attributedTo"));
+			return copy;
+		}
+
+		static void Name(JsonObject node, IReadOnlyList<ForeignAvatar> members, bool mention)
+		{
+			var cc = node["cc"] as JsonArray ?? new JsonArray();
+			var tags = node["tag"] as JsonArray ?? new JsonArray();
+			foreach (var member in members)
+			{
+				if (!cc.Any(c => c?.GetValue<string>() == member.ActorURI))
+					cc.Add(member.ActorURI);
+				if (mention && !tags.Any(t => t?["href"]?.GetValue<string>() == member.ActorURI))
+					tags.Add(new JsonObject { ["type"] = "Mention", ["href"] = member.ActorURI, ["name"] = Handle(member) });
+			}
+			node["cc"] = cc;
+			if (mention)
+				node["tag"] = tags;
+		}
+
+		static string Handle(ForeignAvatar member) =>
+			string.IsNullOrEmpty(member.UserName) ? member.ActorURI : $"@{member.UserName}@{new Uri(member.ActorURI).Authority}";
+
 		public async Task PublishProfile(LocalActor actor, CancellationToken token)
 		{
 			var document = ActivityPubRenderer.Actor(actor);

PrivaPub/Federation/Rendering/ActivityPubRenderer.cs

@@ -138,7 +138,9 @@ namespace PrivaPub.Federation.Rendering
 			{
 				PostVisibility.Circle when group != default => (new JsonArray(group.Uri, group.Flock), new JsonArray(mentions)),
 				PostVisibility.Unlisted => (new JsonArray(author.Followers), new JsonArray(mentions.Prepend(Public).ToArray())),
-				PostVisibility.FollowersOnly => (new JsonArray(author.Followers), new JsonArray(mentions)),
+				// Pleroma and Akkoma call a post private only if a `to` contains "/followers" or its cc is not empty, and ours
+				// are /groupies: with an empty cc every followers-only post would be a DM there. Naming them again says nothing new.
+				PostVisibility.FollowersOnly => (new JsonArray(author.Followers), new JsonArray(mentions.Append(author.Followers).ToArray())),
 				PostVisibility.Direct => (new JsonArray(mentions), new JsonArray()),
 				_ => (new JsonArray(Public), new JsonArray(mentions.Prepend(author.Followers).ToArray()))
 			};
@@ -176,11 +178,11 @@ namespace PrivaPub.Federation.Rendering
 			return note;
 		}
 
-		public static JsonObject UpdateOf(PostEntity post, LocalActor author, string reason)
+		public static JsonObject UpdateOf(PostEntity post, LocalActor author, LocalActor group, string reason)
 		{
 			var note = post.Visibility == PostVisibility.Direct
 				? DirectNote(post, author, Array.Empty<(string, string)>(), post.ContextURI)
-				: Note(post, author, default, post.InReplyToURI);
+				: Note(post, author, group, post.InReplyToURI);
 			note["to"] = new JsonArray(post.To.Select(t => (JsonNode)t).ToArray());
 			note["cc"] = new JsonArray(post.Cc.Select(c => (JsonNode)c).ToArray());
 			return new JsonObject
@@ -355,13 +357,13 @@ namespace PrivaPub.Federation.Rendering
 			["object"] = note
 		};
 
-		public static JsonObject Announce(LocalActor group, string objectUri, string activityId) => new()
+		public static JsonObject Announce(LocalActor group, string objectUri, string activityId, DateTime? published = default) => new()
 		{
 			["@context"] = ActivityStreams,
 			["id"] = group.ActivityUri(activityId),
 			["type"] = "Announce",
 			["actor"] = group.Uri,
-			["published"] = Timestamp(DateTime.UtcNow),
+			["published"] = Timestamp(published ?? DateTime.UtcNow),
 			["to"] = new JsonArray(Public),
 			["cc"] = new JsonArray(group.Followers),
 			["object"] = objectUri

PrivaPub/Federation/Signing/SignedFetchAuthorizer.cs

@@ -1,23 +1,34 @@
 using PrivaPub.Federation.Actors;
 using PrivaPub.Federation.Objects;
+using PrivaPub.Models.Federation;
+using PrivaPub.Models.Post;
 using PrivaPub.Models.User;
+using PrivaPub.StaticServices;
 
 using GroupEntity = PrivaPub.Models.Group.Group;
+using PostEntity = PrivaPub.Models.Post.Post;
 
 namespace PrivaPub.Federation.Signing
 {
 	public interface ISignedFetchAuthorizer
 	{
 		Task<ForeignAvatar> Requester(HttpRequest request, CancellationToken token);
+		Task<bool> MayRead(PostEntity post, ForeignAvatar requester, CancellationToken token);
 	}
 
+	// Who may refetch a post that is not public (owner decision 2026-10-04). A server that received a followers-only post,
+	// a DM or a circle post refetches it, signed by the account it was for or by its instance actor, and Mastodon deletes its
+	// copy when the refetch answers 404. So the post is served to a signed request from someone it was for, or from the
+	// instance actor of a server where someone it was for lives; everyone else still gets 404.
 	public class SignedFetchAuthorizer : ISignedFetchAuthorizer
 	{
 		readonly IRemoteActorService _remoteActors;
+		readonly DbEntities _dbEntities;
 
-		public SignedFetchAuthorizer(IRemoteActorService remoteActors)
+		public SignedFetchAuthorizer(IRemoteActorService remoteActors, DbEntities dbEntities)
 		{
 			_remoteActors = remoteActors;
+			_dbEntities = dbEntities;
 		}
 
 		public async Task<ForeignAvatar> Requester(HttpRequest request, CancellationToken token)
@@ -33,8 +44,48 @@ namespace PrivaPub.Federation.Signing
 			return actor != default && HttpSignatures.Verify(actor.PublicKey, signingString, parameters.Signature) ? actor : default;
 		}
 
+		public async Task<bool> MayRead(PostEntity post, ForeignAvatar requester, CancellationToken token)
+		{
+			if (post == default || requester == default)
+				return false;
+			switch (post.Visibility)
+			{
+				case PostVisibility.Public or PostVisibility.Unlisted:
+					return true;
+				case PostVisibility.Circle:
+					var circle = string.IsNullOrEmpty(post.GroupId) ? default : await _dbEntities.Groups.MatchID(post.GroupId).ExecuteFirstAsync(token);
+					return circle != default && MayReadCircle(circle, requester);
+				case PostVisibility.Direct:
+					return Addressed(post).Any(uri => Is(requester, uri));
+				case PostVisibility.FollowersOnly:
+					if (Addressed(post).Any(uri => Is(requester, uri)))
+						return true;
+					var followers = await _dbEntities.Followers
+						.Match(f => f.LocalActorId == post.GroupUserId && f.LocalActorKind == LocalActorKind.Person && f.IsAccepted)
+						.ExecuteAsync(token);
+					return followers.Any(f => Is(requester, f.ActorURI));
+				default:
+					return false;
+			}
+		}
+
+		static IEnumerable<string> Addressed(PostEntity post) =>
+			post.To.Concat(post.Cc).Concat(post.Mentions.Select(m => m.ActorURI)).Where(uri => !string.IsNullOrEmpty(uri));
+
+		// the account itself, or the instance actor of the server it lives on
+		static bool Is(ForeignAvatar requester, string actorUri) =>
+			actorUri == requester.ActorURI || requester.AvatarType == AvatarType.Application && Origin.Same(actorUri, requester.ActorURI);
+
 		public static bool MayReadCircle(GroupEntity circle, ForeignAvatar requester) =>
-			requester != default && circle.Members.Any(m => m.IsForeign
+			requester != default && circle.Members.Any(m => m.IsForeign && Is(requester, m.AvatarId));
-				&& (m.AvatarId == requester.ActorURI || requester.AvatarType == AvatarType.Application && Origin.Same(m.AvatarId, requester.ActorURI)));
+
+		public static bool MayReadConversation(Models.Group.DmGroup conversation, ForeignAvatar requester) =>
+			requester != default && conversation.Members.Any(m => m.IsForeign && Is(requester, m.AvatarId));
+
+		// the members a refetch names in cc: the requesting member, or the members on an instance actor's server
+		public static IReadOnlyList<string> CircleReaders(GroupEntity circle, ForeignAvatar requester) =>
+			requester == default
+				? Array.Empty<string>()
+				: circle.Members.Where(m => m.IsForeign && Is(requester, m.AvatarId)).Select(m => m.AvatarId).ToList();
 	}
 }

PrivaPub/Infrastructure/Cli/AdminCommands.cs

@@ -1,22 +1,49 @@
 using MongoDB.Entities;
 
 using PrivaPub.ClientModels;
+using PrivaPub.ClientModels.User;
+using PrivaPub.ClientModels.User.Avatar;
 using PrivaPub.Models.User;
+using PrivaPub.Services;
+using PrivaPub.Services.ClientToServer.Private;
+using PrivaPub.StaticServices;
+
+using System.ComponentModel.DataAnnotations;
+using System.Security.Cryptography;
 
 namespace PrivaPub.Infrastructure.Cli
 {
+	// `PrivaPub admin ...` runs with the whole server built but not started: no Kestrel, no hosted services.
 	public static class AdminCommands
 	{
-		const string Usage = "usage: PrivaPub admin promote|demote <root username>";
+		public const string SmokeLogin = "deploy-smoke";
 
-		public static async Task<int> Run(string[] args)
+		const string Usage = """
+			usage: PrivaPub admin promote|demote <root>
+			       PrivaPub admin create-root <login> [--admin]   the password is read from standard input
+			       PrivaPub admin smoke <persona>                 prints "<login> <password>" for the deploy's signed-in check
+			""";
+
+		public static async Task<int> Run(string[] args, IServiceProvider services, TextReader input = default, TextWriter output = default)
 		{
-			if (args is not [("promote" or "demote") and var verb, var userName])
+			input ??= Console.In;
+			output ??= Console.Out;
+			switch (args)
 			{
+				case [("promote" or "demote") and var verb, var userName]:
+					return await Promote(verb == "promote", userName, output);
+				case ["create-root", var login, .. var flags] when flags.All(f => f == "--admin"):
+					return await CreateRoot(services, login, input.ReadLine(), flags.Contains("--admin"), output);
+				case ["smoke", var persona]:
+					return await Smoke(services, persona, output);
+				default:
 					Console.Error.WriteLine(Usage);
 					return 2;
 			}
+		}
 
+		static async Task<int> Promote(bool promote, string userName, TextWriter output)
+		{
 			userName = userName.ToLowerInvariant();
 			var user = await DB.Default.Find<RootUser>().Match(u => u.UserName == userName).ExecuteFirstAsync();
 			if (user == default)
@@ -26,14 +53,94 @@ namespace PrivaPub.Infrastructure.Cli
 			}
 
 			user.Policies.RemoveAll(p => p is Policies.IsAdmin or Policies.IsModerator);
-			if (verb == "promote")
+			if (promote)
 				user.Policies.AddRange(new[] { Policies.IsAdmin, Policies.IsModerator });
 			if (!user.Policies.Contains(Policies.IsUser))
 				user.Policies.Add(Policies.IsUser);
 			user.UpdatedAt = DateTime.UtcNow;
 			await DB.Default.SaveAsync(user);
 
-			Console.WriteLine($"{userName}: {string.Join(", ", user.Policies)}");
+			output.WriteLine($"{userName}: {string.Join(", ", user.Policies)}");
+			return 0;
+		}
+
+		// With sign-up closed this is how the first root is made; group invitations make the rest.
+		static async Task<int> CreateRoot(IServiceProvider services, string login, string password, bool admin, TextWriter output)
+		{
+			var form = new LoginForm { UserName = login, Password = password?.Trim() };
+			var problems = new List<ValidationResult>();
+			if (!Validator.TryValidateObject(form, new ValidationContext(form), problems, validateAllProperties: true))
+			{
+				Console.Error.WriteLine(string.Join(Environment.NewLine, problems.Select(p => p.ErrorMessage)));
+				return 1;
+			}
+			var created = await services.GetRequiredService<IRootUsersService>().SignUpAsync(form);
+			if (!created.IsValid)
+			{
+				Console.Error.WriteLine(created.ErrorMessage);
+				return 1;
+			}
+			return admin ? await Promote(true, login, output) : await Report(login, output);
+		}
+
+		static Task<int> Report(string login, TextWriter output)
+		{
+			output.WriteLine($"{login.ToLowerInvariant()}: created");
+			return Task.FromResult(0);
+		}
+
+		// The deploy's signed-in smoke check: a root nobody signs in to by hand, owning one undiscoverable persona. Every run
+		// sets a new password and prints it, so no secret is kept anywhere and nothing waits on a person.
+		static async Task<int> Smoke(IServiceProvider services, string personaName, TextWriter output)
+		{
+			personaName = personaName.ToLowerInvariant();
+			var password = "Smoke-x" + Convert.ToHexStringLower(RandomNumberGenerator.GetBytes(24));
+			var root = await DB.Default.Find<RootUser>().Match(u => u.UserName == SmokeLogin).ExecuteFirstAsync();
+			if (root == default)
+			{
+				var created = await services.GetRequiredService<IRootUsersService>().SignUpAsync(new LoginForm { UserName = SmokeLogin, Password = password });
+				if (!created.IsValid)
+				{
+					Console.Error.WriteLine(created.ErrorMessage);
+					return 1;
+				}
+				root = await DB.Default.Find<RootUser>().Match(u => u.UserName == SmokeLogin).ExecuteFirstAsync();
+			}
+			else if (root.DeletedAt.HasValue || root.IsBanned)
+			{
+				Console.Error.WriteLine($"the root '{SmokeLogin}' is deleted or banned");
+				return 1;
+			}
+			else
+				await DB.Default.Update<RootUser>().MatchID(root.ID)
+					.Modify(u => u.HashedPassword, services.GetRequiredService<IPasswordHasher>().Hash(password))
+					.Modify(u => u.UpdatedAt, DateTime.UtcNow)
+					.ExecuteAsync();
+
+			var owned = (await DB.Default.Find<RootToAvatar>().Match(ra => ra.RootId == root.ID).ExecuteAsync()).Select(ra => ra.AvatarId).ToList();
+			var persona = await DB.Default.Find<Avatar>().Match(a => owned.Contains(a.ID) && a.UserName == personaName && !a.DeletionAt.HasValue).ExecuteFirstAsync();
+			if (persona == default)
+			{
+				var inserted = await services.GetRequiredService<IPrivateAvatarUsersService>().InsertAvatar(new InsertAvatarForm
+				{
+					RootId = root.ID,
+					UserName = personaName,
+					Name = personaName,
+					Biography = "The deploy signs in here to check that the Mastodon API works for a signed-in persona."
+				});
+				if (!inserted.IsValid)
+				{
+					Console.Error.WriteLine(inserted.ErrorMessage);
+					return 1;
+				}
+				persona = await DB.Default.Find<Avatar>().MatchID(((ViewAvatar)inserted.Data).Id).ExecuteFirstAsync();
+			}
+			await DB.Default.Update<Avatar>().MatchID(persona.ID)
+				.Modify(a => a.Settings.IsDiscoverable, false)
+				.Modify(a => a.Settings.IsIndexable, false)
+				.ExecuteAsync();
+
+			output.WriteLine($"{SmokeLogin} {password}");
 			return 0;
 		}
 	}

PrivaPub/Infrastructure/Data/Indexes.cs

@@ -1,4 +1,4 @@
-using MongoDB.Bson;
+using MongoDB.Bson;
 using MongoDB.Driver;
 using MongoDB.Entities;
 
@@ -54,6 +54,7 @@ namespace PrivaPub.Infrastructure.Data
 			await Plain<Group>(token, g => g.InvitationCode);
 
 			await Plain<DmGroup>(token, g => g.ParticipantsKey);
+			await Unique<GroupAnnouncement>(a => a.ActivityURI, Builders<GroupAnnouncement>.Filter.Type(a => a.ActivityURI, BsonType.String), token);
 
 			await Plain<Delivery>(token, d => d.DeliveredAt, d => d.AbandonedAt, d => d.NextAttemptAt);
 
@@ -130,6 +131,9 @@ namespace PrivaPub.Infrastructure.Data
 			await DB.Default.Index<RemoteInstanceSnapshot>().Key(s => s.Host, KeyType.Ascending).Key(s => s.Week, KeyType.Ascending)
 				.Option(o => o.Unique = true).CreateAsync(token);
 			await Plain<RemoteInstanceSnapshot>(token, s => s.Week);
+			await Plain<RemoteInstanceSnapshot>(token, s => s.CdnDomain, s => s.Week);
+			await Plain<RemoteInstanceSnapshot>(token, s => s.Cdn, s => s.Week);
+			await Plain<CdnRangeSet>(token, s => s.Key);
 			await Plain<RemoteInstance>(token, i => i.Seen);
 			await Plain<RemoteInstance>(token, i => i.LastCrawledAt);
 		}

PrivaPub/Infrastructure/Data/Migrations/_011_recovery_codes_are_hashed.cs

@@ -0,0 +1,14 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.User;
+
+namespace PrivaPub.Infrastructure.Data.Migrations
+{
+	// Recovery codes were stored in plain text and never expired; from now on only a hash with a one-hour expiry is kept.
+	// The old codes are dropped: anyone mid-recovery asks again.
+	public class _011_recovery_codes_are_hashed : IMigration
+	{
+		public async Task UpgradeAsync() =>
+			await DB.Default.DeleteAsync<EmailRecovery>(r => r.CodeHash == null);
+	}
+}

PrivaPub/Infrastructure/Data/Migrations/_012_counts_follow_one_rule.cs

@@ -0,0 +1,35 @@
+using MongoDB.Driver;
+using MongoDB.Entities;
+
+using PrivaPub.Federation.Inbox;
+using PrivaPub.Models.Post;
+using PrivaPub.Models.User;
+
+using PostEntity = PrivaPub.Models.Post.Post;
+
+namespace PrivaPub.Infrastructure.Data.Migrations
+{
+	// replies_count now counts only public and unlisted replies, and accounts that deleted themselves leave nothing in the
+	// counts (GoneActors). Both are recounted once for what was stored before.
+	public class _012_counts_follow_one_rule : IMigration
+	{
+		public async Task UpgradeAsync()
+		{
+			var counted = (await DB.Default.Find<PostEntity, string>()
+					.Match(p => p.AnsweringToPostId != null && !p.DeletedAt.HasValue && !p.AuthorGone
+						&& (p.Visibility == PostVisibility.Public || p.Visibility == PostVisibility.Unlisted))
+					.Project(p => p.AnsweringToPostId)
+					.ExecuteAsync())
+				.GroupBy(id => id)
+				.ToDictionary(g => g.Key, g => g.Count());
+			var stale = await DB.Default.Find<PostEntity>().Match(p => p.RepliesCount > 0).Project(p => p.Include(x => x.ID).Include(x => x.RepliesCount)).ExecuteAsync();
+			foreach (var post in stale.Where(p => counted.GetValueOrDefault(p.ID) != p.RepliesCount))
+				await DB.Default.Update<PostEntity>().MatchID(post.ID).Modify(p => p.RepliesCount, counted.GetValueOrDefault(post.ID)).ExecuteAsync();
+			foreach (var (id, count) in counted.Where(c => stale.All(p => p.ID != c.Key)))
+				await DB.Default.Update<PostEntity>().MatchID(id).Modify(p => p.RepliesCount, count).ExecuteAsync();
+
+			foreach (var gone in await DB.Default.Find<ForeignAvatar>().Match(a => a.DeletionAt != null && a.ForgottenAt == null).ExecuteAsync())
+				await GoneActors.Forget(gone, CancellationToken.None);
+		}
+	}
+}

PrivaPub/Infrastructure/Geo/CdnCatalog.cs

@@ -0,0 +1,156 @@
+using System.Net;
+using System.Text.Json;
+
+namespace PrivaPub.Infrastructure.Geo
+{
+	// How a published list of a CDN's addresses is written.
+	public enum CdnListFormat
+	{
+		Lines,//one CIDR per line (Cloudflare)
+		StringArray,//a JSON array of addresses or CIDRs (Bunny)
+		AddressesJson,//{"addresses": [...], "ipv6_addresses"/"addresses_v6": [...]} (Fastly, Gcore)
+		AwsCloudFront,//AWS ip-ranges.json, CLOUDFRONT entries only
+		ImpervaJson//{"ipRanges": [...], "ipv6Ranges": [...]}
+	}
+
+	public sealed record CdnList(string Url, CdnListFormat Format, string Method = "GET", string Body = default);
+
+	// A CDN, or any edge network whose addresses say nothing about where a server runs. Domain names it in statistics.
+	public sealed record CdnProvider(string Name, string Domain, int[] Asns, CdnList[] Lists, Func<HttpResponseMessage, bool> Fingerprint)
+	{
+		public string Key => Domain ?? Name.ToLowerInvariant();
+	}
+
+	// owner decision (2026-10-04): PrivaPub finds CDNs by itself, three ways, best first. The address ranges a CDN
+	// publishes (downloaded daily by CdnUpdater), the CDN's fingerprint in the responses PrivaPub already gets from a server
+	// (EdgeHintsHandler), and the networks (ASN) that carry nothing but a CDN. A network shared with plain hosting (AWS,
+	// Google, Microsoft, DataPacket) is never listed by ASN: only ranges or fingerprints name those CDNs.
+	public static class CdnCatalog
+	{
+		public static readonly IReadOnlyList<CdnProvider> All = new CdnProvider[]
+		{
+			new("Cloudflare", "cloudflare.com", new[] { 13335, 209242 },
+				new[] { new CdnList("https://www.cloudflare.com/ips-v4", CdnListFormat.Lines), new CdnList("https://www.cloudflare.com/ips-v6", CdnListFormat.Lines) },
+				r => Has(r, "cf-ray") || ServerIs(r, "cloudflare")),
+			new("Fastly", "fastly.com", new[] { 54113 },
+				new[] { new CdnList("https://api.fastly.com/public-ip-list", CdnListFormat.AddressesJson) },
+				r => Has(r, "x-fastly-request-id") || Has(r, "fastly-restarts") || Value(r, "x-served-by")?.StartsWith("cache-", StringComparison.OrdinalIgnoreCase) == true),
+			new("Amazon CloudFront", "cloudfront.net", Array.Empty<int>(),
+				new[] { new CdnList("https://ip-ranges.amazonaws.com/ip-ranges.json", CdnListFormat.AwsCloudFront) },
+				r => Has(r, "x-amz-cf-id") || Has(r, "x-amz-cf-pop") || Value(r, "via")?.Contains("cloudfront", StringComparison.OrdinalIgnoreCase) == true),
+			new("Akamai", "akamai.com", new[] { 20940, 16625, 16702, 21342 }, Array.Empty<CdnList>(),
+				r => Has(r, "akamai-grn") || Has(r, "x-akamai-transformed") || Has(r, "akamai-cache-status") || ServerStarts(r, "AkamaiGHost") || ServerStarts(r, "AkamaiNetStorage")),
+			new("Bunny", "bunny.net", new[] { 200325 },
+				new[] { new CdnList("https://api.bunny.net/system/edgeserverlist", CdnListFormat.StringArray), new CdnList("https://api.bunny.net/system/edgeserverlist/IPv6", CdnListFormat.StringArray) },
+				r => ServerStarts(r, "BunnyCDN") || Has(r, "cdn-pullzone") || Has(r, "cdn-requestid")),
+			new("Gcore", "gcore.com", Array.Empty<int>(),
+				new[] { new CdnList("https://api.gcore.com/cdn/public-ip-list", CdnListFormat.AddressesJson) },
+				r => ServerStarts(r, "gcore")),
+			new("Imperva", "imperva.com", new[] { 19551 },
+				new[] { new CdnList("https://my.imperva.com/api/integration/v1/ips", CdnListFormat.ImpervaJson, "POST", "resp_format=json") },
+				r => Has(r, "x-iinfo") || Value(r, "x-cdn") is "Imperva" or "Incapsula"),
+			new("CDN77", "cdn77.com", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Has(r, "x-77-nzt") || Has(r, "x-77-cache") || ServerStarts(r, "CDN77")),
+			new("Edgio", "edg.io", new[] { 15133 }, Array.Empty<CdnList>(),
+				r => ServerStarts(r, "ECAcc") || ServerStarts(r, "ECS (") || Has(r, "x-ec-custom-error")),
+			new("Azure Front Door", "azure.microsoft.com", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Has(r, "x-azure-ref")),
+			new("Google Cloud", "cloud.google.com", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Value(r, "via")?.Contains("google", StringComparison.OrdinalIgnoreCase) == true),
+			new("Vercel", "vercel.com", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Has(r, "x-vercel-id") || ServerIs(r, "Vercel")),
+			new("Netlify", "netlify.com", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Has(r, "x-nf-request-id") || ServerIs(r, "Netlify")),
+			new("Sucuri", "sucuri.net", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => Has(r, "x-sucuri-id") || ServerStarts(r, "Sucuri")),
+			new("DDoS-Guard", "ddos-guard.net", Array.Empty<int>(), Array.Empty<CdnList>(),
+				r => ServerIs(r, "ddos-guard"))
+		};
+
+		public static CdnProvider ByKey(string key) =>
+			key == default ? default : All.FirstOrDefault(p => string.Equals(p.Key, key, StringComparison.OrdinalIgnoreCase) || string.Equals(p.Name, key, StringComparison.OrdinalIgnoreCase));
+
+		public static CdnProvider OfAsn(int? asn) => asn is { } number ? All.FirstOrDefault(p => p.Asns.Contains(number)) : default;
+
+		// The CDN a response passed through: a known fingerprint, or a CDN that names itself in X-CDN.
+		public static CdnProvider FromResponse(HttpResponseMessage response)
+		{
+			if (response == default)
+				return default;
+			var known = All.FirstOrDefault(p => p.Fingerprint(response));
+			if (known != default)
+				return known;
+			var named = Value(response, "x-cdn")?.Trim();
+			return named is { Length: > 1 and <= 40 } && named.All(c => char.IsLetterOrDigit(c) || c is ' ' or '-' or '.' or '_')
+				? new CdnProvider(named, default, Array.Empty<int>(), Array.Empty<CdnList>(), _ => false)
+				: default;
+		}
+
+		// The networks a published list holds; an entry that is not an address or a network is an error, never skipped.
+		public static List<IPNetwork> Parse(CdnListFormat format, string body)
+		{
+			IEnumerable<string> entries = format switch
+			{
+				CdnListFormat.Lines => body.Split('\n', StringSplitOptions.RemoveEmptyEntries | StringSplitOptions.TrimEntries).Where(l => !l.StartsWith('#')),
+				CdnListFormat.StringArray => Root(body),
+				CdnListFormat.AddressesJson => Json(body, "addresses", "ipv6_addresses", "addresses_v6"),
+				CdnListFormat.ImpervaJson => Json(body, "ipRanges", "ipv6Ranges"),
+				CdnListFormat.AwsCloudFront => CloudFront(body),
+				_ => Enumerable.Empty<string>()
+			};
+			return entries.Select(Network).ToList();
+		}
+
+		static IPNetwork Network(string entry)
+		{
+			if (IPNetwork.TryParse(entry, out var network))
+				return network;
+			if (IPAddress.TryParse(entry, out var address))
+				return new IPNetwork(address, address.AddressFamily == System.Net.Sockets.AddressFamily.InterNetwork ? 32 : 128);
+			throw new FormatException($"not an address or a network: {entry}");
+		}
+
+		static List<string> Root(string body)
+		{
+			using var document = JsonDocument.Parse(body);
+			return Strings(document.RootElement);
+		}
+
+		static IEnumerable<string> Json(string body, params string[] properties)
+		{
+			using var document = JsonDocument.Parse(body);
+			var entries = new List<string>();
+			foreach (var property in properties)
+				if (document.RootElement.TryGetProperty(property, out var array))
+					entries.AddRange(Strings(array));
+			return entries;
+		}
+
+		static IEnumerable<string> CloudFront(string body)
+		{
+			using var document = JsonDocument.Parse(body);
+			var entries = new List<string>();
+			foreach (var (array, field) in new[] { ("prefixes", "ip_prefix"), ("ipv6_prefixes", "ipv6_prefix") })
+				if (document.RootElement.TryGetProperty(array, out var prefixes))
+					foreach (var prefix in prefixes.EnumerateArray())
+						if (prefix.TryGetProperty("service", out var service) && service.GetString() == "CLOUDFRONT" && prefix.TryGetProperty(field, out var value))
+							entries.Add(value.GetString());
+			return entries;
+		}
+
+		static List<string> Strings(JsonElement array) =>
+			array.ValueKind == JsonValueKind.Array ? array.EnumerateArray().Select(e => e.GetString()).ToList() : throw new FormatException("not a list");
+
+		static bool Has(HttpResponseMessage response, string header) =>
+			response.Headers.Contains(header) || response.Content?.Headers.Contains(header) == true;
+
+		static string Value(HttpResponseMessage response, string header) =>
+			response.Headers.TryGetValues(header, out var values) || response.Content?.Headers.TryGetValues(header, out values) == true
+				? string.Join(", ", values)
+				: default;
+
+		static bool ServerIs(HttpResponseMessage response, string name) => string.Equals(Value(response, "server")?.Trim(), name, StringComparison.OrdinalIgnoreCase);
+
+		static bool ServerStarts(HttpResponseMessage response, string prefix) => Value(response, "server")?.TrimStart().StartsWith(prefix, StringComparison.OrdinalIgnoreCase) == true;
+	}
+}

PrivaPub/Infrastructure/Geo/CdnRanges.cs

@@ -0,0 +1,65 @@
+using MongoDB.Entities;
+
+using PrivaPub.Models.Jobs;
+
+using System.Net;
+
+namespace PrivaPub.Infrastructure.Geo
+{
+	public interface ICdnRanges
+	{
+		// the CDN whose published ranges hold the address, or default
+		CdnProvider Of(IPAddress address);
+		void Replace(CdnRangeSet set);
+		Task Load(CancellationToken token);
+		// per CDN key: how many ranges are known and when they were downloaded
+		IReadOnlyDictionary<string, (int Ranges, DateTime FetchedAt)> Status { get; }
+	}
+
+	// The published CDN ranges in memory, rebuilt from the stored CdnRangeSets at start and replaced set by set as
+	// CdnUpdater downloads them. A few thousand networks: a linear scan per describe is cheap, and describes are weekly.
+	public class CdnRanges : ICdnRanges
+	{
+		readonly object _gate = new();
+		Dictionary<string, (CdnProvider Provider, IPNetwork[] Networks, DateTime FetchedAt)> _sets = new(StringComparer.OrdinalIgnoreCase);
+
+		public IReadOnlyDictionary<string, (int Ranges, DateTime FetchedAt)> Status
+		{
+			get
+			{
+				lock (_gate)
+					return _sets.ToDictionary(s => s.Key, s => (s.Value.Networks.Length, s.Value.FetchedAt), StringComparer.OrdinalIgnoreCase);
+			}
+		}
+
+		public CdnProvider Of(IPAddress address)
+		{
+			if (address == default)
+				return default;
+			if (address.IsIPv4MappedToIPv6)
+				address = address.MapToIPv4();
+			Dictionary<string, (CdnProvider Provider, IPNetwork[] Networks, DateTime FetchedAt)> sets;
+			lock (_gate)
+				sets = _sets;
+			foreach (var (provider, networks, _) in sets.Values)
+				foreach (var network in networks)
+					if (network.BaseAddress.AddressFamily == address.AddressFamily && network.Contains(address))
+						return provider;
+			return default;
+		}
+
+		public void Replace(CdnRangeSet set)
+		{
+			var provider = CdnCatalog.ByKey(set.Key) ?? new CdnProvider(set.Name, set.Key, Array.Empty<int>(), Array.Empty<CdnList>(), _ => false);
+			var networks = set.Ranges.Select(r => IPNetwork.TryParse(r, out var n) ? n : (IPNetwork?)null).Where(n => n != default).Select(n => n!.Value).ToArray();
+			lock (_gate)
+				_sets = new(_sets, StringComparer.OrdinalIgnoreCase) { [set.Key] = (provider, networks, set.FetchedAt) };
+		}
+
+		public async Task Load(CancellationToken token)
+		{
+			foreach (var set in await DB.Default.Find<CdnRangeSet>().ExecuteAsync(token))
+				Replace(set);
+		}
+	}
+}

PrivaPub/Infrastructure/Geo/CdnUpdater.cs

@@ -0,0 +1,114 @@
+using Microsoft.Extensions.Options;
+
+using MongoDB.Entities;
+
+using PrivaPub.Infrastructure.Statistics;
+using PrivaPub.Models.Jobs;
+
+using System.Text;
+
+namespace PrivaPub.Infrastructure.Geo
+{
+	// Keeps the CDNs' published address ranges current by itself (owner decision 2026-10-04): at start it loads the stored
+	// ones, then once a day it downloads each list again. A list that fails to download or to parse, or comes back empty,
+	// leaves the stored one in place and is tried the next day. Like GeoUpdater, plain HTTPS to fixed hosts, not federation.
+	public sealed class CdnUpdater : BackgroundService
+	{
+		public const string ClientName = "cdn";
+		static readonly TimeSpan FirstWait = TimeSpan.FromMinutes(1);
+		static readonly TimeSpan Interval = TimeSpan.FromHours(24);
+		const int MaxBytes = 16 * 1024 * 1024;
+		const int MaxRanges = 200_000;
+
+		readonly IHttpClientFactory _http;
+		readonly IOptionsMonitor<StatisticsOptions> _options;
+		readonly ICdnRanges _ranges;
+		readonly ILogger<CdnUpdater> _logger;
+
+		public CdnUpdater(IHttpClientFactory http, IOptionsMonitor<StatisticsOptions> options, ICdnRanges ranges, ILogger<CdnUpdater> logger)
+		{
+			_http = http;
+			_options = options;
+			_ranges = ranges;
+			_logger = logger;
+		}
+
+		protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+		{
+			try
+			{
+				await _ranges.Load(stoppingToken);
+				await Task.Delay(FirstWait, stoppingToken);
+				while (!stoppingToken.IsCancellationRequested)
+				{
+					if (_options.CurrentValue.Cdn.AutoUpdate)
+						await Update(CdnCatalog.All, stoppingToken);
+					await Task.Delay(Interval + TimeSpan.FromMinutes(Random.Shared.Next(60)), stoppingToken);
+				}
+			}
+			catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+			{
+			}
+			catch (Exception ex)
+			{
+				_logger.LogWarning(ex, "{Service} stopped", nameof(CdnUpdater));
+			}
+		}
+
+		// The number of CDNs whose ranges were replaced.
+		public async Task<int> Update(IEnumerable<CdnProvider> providers, CancellationToken token)
+		{
+			var replaced = 0;
+			foreach (var provider in providers.Where(p => p.Lists.Length > 0))
+			{
+				try
+				{
+					var ranges = new List<string>();
+					foreach (var list in provider.Lists)
+						ranges.AddRange(CdnCatalog.Parse(list.Format, await Download(list, token)).Select(n => n.ToString()));
+					ranges = ranges.Distinct().ToList();
+					if (ranges.Count == 0 || ranges.Count > MaxRanges)
+						throw new InvalidDataException($"{ranges.Count} ranges");
+
+					var set = await DB.Default.Find<CdnRangeSet>().Match(s => s.Key == provider.Key).ExecuteFirstAsync(token) ?? new CdnRangeSet { Key = provider.Key };
+					set.Name = provider.Name;
+					set.Ranges = ranges;
+					set.Sources = provider.Lists.Select(l => l.Url).ToList();
+					set.FetchedAt = DateTime.UtcNow;
+					await DB.Default.SaveAsync(set, token);
+					_ranges.Replace(set);
+					replaced++;
+				}
+				catch (Exception ex) when (ex is HttpRequestException or InvalidDataException or FormatException or System.Text.Json.JsonException
+					or TaskCanceledException && !token.IsCancellationRequested)
+				{
+					_logger.LogWarning(ex, "Could not update the published ranges of {Cdn}", provider.Name);
+				}
+			}
+			return replaced;
+		}
+
+		async Task<string> Download(CdnList list, CancellationToken token)
+		{
+			using var request = new HttpRequestMessage(list.Method == "POST" ? HttpMethod.Post : HttpMethod.Get, list.Url);
+			request.Headers.Accept.ParseAdd("application/json, text/plain;q=0.9");
+			if (list.Body != default)
+				request.Content = new StringContent(list.Body, Encoding.UTF8, "application/x-www-form-urlencoded");
+			using var response = await _http.CreateClient(ClientName).SendAsync(request, HttpCompletionOption.ResponseHeadersRead, token);
+			response.EnsureSuccessStatusCode();
+			if (response.Content.Headers.ContentLength > MaxBytes)
+				throw new InvalidDataException($"more than {MaxBytes} bytes");
+			await using var stream = await response.Content.ReadAsStreamAsync(token);
+			using var buffer = new MemoryStream();
+			var chunk = new byte[81920];
+			int read;
+			while ((read = await stream.ReadAsync(chunk, token)) > 0)
+			{
+				if (buffer.Length + read > MaxBytes)
+					throw new InvalidDataException($"more than {MaxBytes} bytes");
+				buffer.Write(chunk, 0, read);
+			}
+			return Encoding.UTF8.GetString(buffer.ToArray());
+		}
+	}
+}

PrivaPub/Infrastructure/Geo/GeoLocator.cs

@@ -1,4 +1,4 @@
-using MaxMind.Db;
+using MaxMind.Db;
 
 using Microsoft.Extensions.Options;
 
@@ -25,8 +25,8 @@ namespace PrivaPub.Infrastructure.Geo
 
 	public sealed class DbIpLocator : IGeoLocator, IDisposable
 	{
-		public const string CityFile = "dbip-city-lite.mmdb";
+		public static readonly string CityFile = GeoUpdater.FileOf("city");
-		public const string AsnFile = "dbip-asn-lite.mmdb";
+		public static readonly string AsnFile = GeoUpdater.FileOf("asn");
 		static readonly TimeSpan CheckInterval = TimeSpan.FromMinutes(10);
 
 		readonly IOptionsMonitor<StatisticsOptions> _options;
@@ -60,18 +60,17 @@ namespace PrivaPub.Infrastructure.Geo
 			if (address == default || !IpRangeGuard.IsPublic(address))
 				return default;
 			Refresh();
-			Reader city, asn;
+			Dictionary<string, object> place, network;
-			lock (_lock)
-			{
-				city = _city;
-				asn = _asn;
-			}
-			if (city == default && asn == default)
-				return default;
 			try
 			{
-				var place = city?.Find<Dictionary<string, object>>(address);
+				// under the lock, so a reload cannot dispose a reader in the middle of a lookup; lookups are rare
-				var network = asn?.Find<Dictionary<string, object>>(address);
+				lock (_lock)
+				{
+					if (_city == default && _asn == default)
+						return default;
+					place = _city?.Find<Dictionary<string, object>>(address);
+					network = _asn?.Find<Dictionary<string, object>>(address);
+				}
 				var location = Section(place, "location");
 				return new GeoFix(
 					Text(Section(place, "country"), "iso_code"),
@@ -88,6 +87,14 @@ namespace PrivaPub.Infrastructure.Geo
 			}
 		}
 
+		// Looks at the files again now instead of within the next ten minutes: GeoUpdater has just replaced one.
+		public void Reload()
+		{
+			lock (_lock)
+				_checkedAt = DateTime.MinValue;
+			Refresh();
+		}
+
 		void Refresh()
 		{
 			if (DateTime.UtcNow - _checkedAt < CheckInterval)
@@ -158,23 +165,4 @@ namespace PrivaPub.Infrastructure.Geo
 			_asn?.Dispose();
 		}
 	}
-
-	public static class CdnNetworks
-	{
-		static readonly Dictionary<int, string> Known = new()
-		{
-			[13335] = "Cloudflare",
-			[209242] = "Cloudflare",
-			[54113] = "Fastly",
-			[20940] = "Akamai",
-			[16625] = "Akamai",
-			[16702] = "Akamai",
-			[21342] = "Akamai",
-			[200325] = "Bunny",
-			[60068] = "CDN77",
-			[15133] = "Edgio"
-		};
-
-		public static string Of(int? asn) => asn is { } number && Known.TryGetValue(number, out var name) ? name : default;
-	}
 }

PrivaPub/Infrastructure/Geo/GeoUpdater.cs

@@ -0,0 +1,163 @@
+using MaxMind.Db;
+
+using Microsoft.Extensions.Options;
+
+using PrivaPub.Infrastructure.Statistics;
+
+using System.IO.Compression;
+using System.Net;
+
+namespace PrivaPub.Infrastructure.Geo
+{
+	// Keeps the DB-IP Lite databases current by itself, so a deploy needs no timer and no root: once a day it checks
+	// whether each database was built this month and, if not, fetches this month's (or, early in the month, last month's),
+	// checks it opens as the right kind of database and swaps it in. This, CdnUpdater and SMTP are the server's only traffic
+	// that is not federation, which is why each has its own client instead of IFederationHttp.
+	public sealed class GeoUpdater : BackgroundService
+	{
+		public const string ClientName = "geo";
+		static readonly string[] Kinds = { "city", "asn" };
+		static readonly TimeSpan FirstWait = TimeSpan.FromSeconds(30);
+		static readonly TimeSpan Interval = TimeSpan.FromHours(24);
+
+		readonly IHttpClientFactory _http;
+		readonly IOptionsMonitor<StatisticsOptions> _options;
+		readonly IGeoLocator _locator;
+		readonly ILogger<GeoUpdater> _logger;
+
+		public GeoUpdater(IHttpClientFactory http, IOptionsMonitor<StatisticsOptions> options, IGeoLocator locator, ILogger<GeoUpdater> logger)
+		{
+			_http = http;
+			_options = options;
+			_locator = locator;
+			_logger = logger;
+		}
+
+		public static string FileOf(string kind) => $"dbip-{kind}-lite.mmdb";
+
+		protected override async Task ExecuteAsync(CancellationToken stoppingToken)
+		{
+			try
+			{
+				await Task.Delay(FirstWait, stoppingToken);
+				while (!stoppingToken.IsCancellationRequested)
+				{
+					if (_options.CurrentValue.Geo.AutoUpdate)
+						await Update(DateTime.UtcNow, stoppingToken);
+					await Task.Delay(Interval + TimeSpan.FromMinutes(Random.Shared.Next(60)), stoppingToken);
+				}
+			}
+			catch (OperationCanceledException) when (stoppingToken.IsCancellationRequested)
+			{
+			}
+		}
+
+		// The number of databases replaced. A failure keeps the database already there and is tried again the next day.
+		public async Task<int> Update(DateTime now, CancellationToken token)
+		{
+			var options = _options.CurrentValue;
+			var replaced = 0;
+			try
+			{
+				Directory.CreateDirectory(options.GeoDirectory);
+			}
+			catch (Exception ex) when (ex is IOException or UnauthorizedAccessException)
+			{
+				_logger.LogWarning(ex, "Cannot create {Directory}; servers are not located", options.GeoDirectory);
+				return 0;
+			}
+			foreach (var kind in Kinds)
+			{
+				var path = Path.Combine(options.GeoDirectory, FileOf(kind));
+				var built = BuiltMonth(path);
+				foreach (var month in new[] { Month(now), Month(now).AddMonths(-1) })
+				{
+					if (built >= month)
+						break;
+					try
+					{
+						if (await Install(kind, month, path, options, token))
+						{
+							replaced++;
+							_logger.LogInformation("Installed DB-IP Lite {Kind} {Month:yyyy-MM}", kind, month);
+							break;
+						}
+					}
+					catch (Exception ex) when (ex is HttpRequestException or IOException or InvalidDatabaseException or InvalidDataException
+						or TaskCanceledException && !token.IsCancellationRequested)
+					{
+						_logger.LogWarning(ex, "Could not install DB-IP Lite {Kind} {Month:yyyy-MM}", kind, month);
+						break;
+					}
+				}
+			}
+			if (replaced > 0 && _locator is DbIpLocator locator)
+				locator.Reload();
+			return replaced;
+		}
+
+		static DateTime Month(DateTime at) => new(at.Year, at.Month, 1, 0, 0, 0, DateTimeKind.Utc);
+
+		static DateTime BuiltMonth(string path)
+		{
+			if (!File.Exists(path))
+				return DateTime.MinValue;
+			try
+			{
+				using var reader = new Reader(path, FileAccessMode.MemoryMapped);
+				return Month(reader.Metadata.BuildDate);
+			}
+			catch (Exception ex) when (ex is InvalidDatabaseException or IOException)
+			{
+				return DateTime.MinValue;
+			}
+		}
+
+		// False when that month is not published (yet); throws when it is published but cannot be used.
+		async Task<bool> Install(string kind, DateTime month, string path, StatisticsOptions options, CancellationToken token)
+		{
+			var url = $"{options.Geo.DownloadBase.TrimEnd('/')}/dbip-{kind}-lite-{month:yyyy-MM}.mmdb.gz";
+			var packed = path + ".gz.part";
+			var unpacked = path + ".new";
+			try
+			{
+				using (var response = await _http.CreateClient(ClientName).GetAsync(url, HttpCompletionOption.ResponseHeadersRead, token))
+				{
+					if (response.StatusCode == HttpStatusCode.NotFound)
+						return false;
+					response.EnsureSuccessStatusCode();
+					await using var source = await response.Content.ReadAsStreamAsync(token);
+					await using var target = File.Create(packed);
+					await CopyCapped(source, target, options.Geo.MaxDownloadBytes, token);
+				}
+				await using (var source = new GZipStream(File.OpenRead(packed), CompressionMode.Decompress))
+				await using (var target = File.Create(unpacked))
+					await CopyCapped(source, target, options.Geo.MaxDatabaseBytes, token);
+				using (var reader = new Reader(unpacked, FileAccessMode.MemoryMapped))
+					if (!reader.Metadata.DatabaseType.Contains(kind, StringComparison.OrdinalIgnoreCase))
+						throw new InvalidDatabaseException($"{url} is a {reader.Metadata.DatabaseType} database, not {kind}");
+				File.Move(unpacked, path, overwrite: true);
+				return true;
+			}
+			finally
+			{
+				File.Delete(packed);
+				File.Delete(unpacked);
+			}
+		}
+
+		static async Task CopyCapped(Stream source, Stream target, long limit, CancellationToken token)
+		{
+			var buffer = new byte[81920];
+			long total = 0;
+			int read;
+			while ((read = await source.ReadAsync(buffer, token)) > 0)
+			{
+				total += read;
+				if (total > limit)
+					throw new InvalidDataException($"more than {limit} bytes");
+				await target.WriteAsync(buffer.AsMemory(0, read), token);
+			}
+		}
+	}
+}

PrivaPub/Infrastructure/Http/EdgeHints.cs

@@ -0,0 +1,55 @@
+using PrivaPub.Infrastructure.Geo;
+
+using System.Collections.Concurrent;
+
+namespace PrivaPub.Infrastructure.Http
+{
+	public interface IEdgeHints
+	{
+		void Remember(string host, CdnProvider cdn);
+		CdnProvider Of(string host);
+	}
+
+	// The CDN each remote host's responses came through, as their headers tell it (CdnCatalog fingerprints), for the
+	// weekly description of the server. Like ConnectedAddresses, memory only: what a host answers is never stored per
+	// request.
+	public class EdgeHints : IEdgeHints
+	{
+		const int MaxHosts = 50_000;
+
+		readonly ConcurrentDictionary<string, CdnProvider> _hints = new(StringComparer.OrdinalIgnoreCase);
+
+		public void Remember(string host, CdnProvider cdn)
+		{
+			if (string.IsNullOrEmpty(host))
+				return;
+			if (cdn == default)
+			{
+				_hints.TryRemove(host, out _);
+				return;
+			}
+			if (_hints.Count >= MaxHosts)
+				_hints.Clear();
+			_hints[host] = cdn;
+		}
+
+		public CdnProvider Of(string host) => host != default && _hints.TryGetValue(host, out var cdn) ? cdn : default;
+	}
+
+	// On the federation client: reads each response's CDN fingerprint for its host. A response without one forgets the
+	// host's hint, so a server that leaves its CDN is seen as itself again.
+	public class EdgeHintsHandler : DelegatingHandler
+	{
+		readonly IEdgeHints _hints;
+
+		public EdgeHintsHandler(IEdgeHints hints) => _hints = hints;
+
+		protected override async Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)
+		{
+			var response = await base.SendAsync(request, cancellationToken);
+			if (request.RequestUri is { } uri && (int)response.StatusCode is >= 200 and < 500)
+				_hints.Remember(uri.Host, CdnCatalog.FromResponse(response));
+			return response;
+		}
+	}
+}

PrivaPub/Infrastructure/RateLimiting.cs

@@ -1,4 +1,5 @@
 using Microsoft.AspNetCore.RateLimiting;
+using Microsoft.Extensions.Options;
 
 using PrivaPub.Federation.Objects;
 using PrivaPub.Federation.Signing;
@@ -9,13 +10,22 @@ using System.Threading.RateLimiting;
 
 namespace PrivaPub.Infrastructure
 {
+	public class RateLimitOptions
+	{
+		public int AccountsPerMinute { get; set; } = 10;//sign-ups, sign-ins and recoveries per client address
+		public int InboxBurst { get; set; } = 300;//deliveries a sending origin may make at once
+		public int InboxPerTenSeconds { get; set; } = 50;//and the rate it earns them back
+	}
+
 	public static class RateLimiting
 	{
 		public const string Accounts = "accounts";
 		public const string Inbox = "inbox";
 
-		public static IServiceCollection PrivaPubRateLimiting(this IServiceCollection service) =>
+		static RateLimitOptions Limits(HttpContext context) => context.RequestServices.GetRequiredService<IOptions<RateLimitOptions>>().Value;
-			service.AddRateLimiter(options =>
+
+		public static IServiceCollection PrivaPubRateLimiting(this IServiceCollection service, IConfiguration configuration) =>
+			service.Configure<RateLimitOptions>(configuration.GetSection("RateLimits")).AddRateLimiter(options =>
 			{
 				options.RejectionStatusCode = StatusCodes.Status429TooManyRequests;
 				options.OnRejected = (context, _) =>
@@ -39,13 +49,13 @@ namespace PrivaPub.Infrastructure
 				};
 				options.AddPolicy(Accounts, context => RateLimitPartition.GetFixedWindowLimiter(
 					context.Connection.RemoteIpAddress?.ToString() ?? "unknown",
-					_ => new FixedWindowRateLimiterOptions { PermitLimit = 10, Window = TimeSpan.FromMinutes(1), QueueLimit = 0 }));
+					_ => new FixedWindowRateLimiterOptions { PermitLimit = Limits(context).AccountsPerMinute, Window = TimeSpan.FromMinutes(1), QueueLimit = 0 }));
 				options.AddPolicy(Inbox, context => RateLimitPartition.GetTokenBucketLimiter(
 					SenderOrigin(context.Request) ?? "unsigned:" + context.Connection.RemoteIpAddress,
 					_ => new TokenBucketRateLimiterOptions
 					{
-						TokenLimit = 300,
+						TokenLimit = Limits(context).InboxBurst,
-						TokensPerPeriod = 50,
+						TokensPerPeriod = Limits(context).InboxPerTenSeconds,
 						ReplenishmentPeriod = TimeSpan.FromSeconds(10),
 						QueueLimit = 0
 					}));

PrivaPub/Infrastructure/RegistrationOptions.cs

@@ -0,0 +1,19 @@
+namespace PrivaPub.Infrastructure
+{
+	public enum RegistrationMode
+	{
+		Invitations,
+		Open
+	}
+
+	// Who may make a root login. NodeInfo, both instance API versions and the sign-up endpoint read this one switch, so they
+	// cannot disagree. A group invitation always creates an account, whatever the mode.
+	public class RegistrationOptions
+	{
+		public RegistrationMode Mode { get; set; } = RegistrationMode.Invitations;//owner decision (2026-10-04): invitations only
+
+		public bool IsOpen => Mode == RegistrationMode.Open;
+
+		public const string ClosedMessage = "Sign-up is by invitation only: ask someone here for a group invitation.";
+	}
+}

PrivaPub/Infrastructure/Statistics/StatisticsOptions.cs

@@ -1,14 +1,40 @@
-namespace PrivaPub.Infrastructure.Statistics
+namespace PrivaPub.Infrastructure.Statistics
 {
 	public class StatisticsOptions
 	{
 		public bool Enabled { get; set; } = true;
 		public string GeoDirectory { get; set; } = "/var/lib/privapub/geo";
-		public int PublicCityMinUsers { get; set; } = 10;
 		public CrawlerOptions Crawler { get; set; } = new();
+		public GeoOptions Geo { get; set; } = new();
+		public CdnOptions Cdn { get; set; } = new();
 	}
 
-	//owner decision: off by default; when on, one server a minute, each at most weekly, at most MaxHosts servers
+	//owner decision (2026-10-04): the server downloads the CDNs' published address ranges daily (CdnUpdater)
+	public class CdnOptions
+	{
+		public bool AutoUpdate { get; set; } = true;
+	}
+
+	//owner decision (2026-10-04): the server keeps its DB-IP Lite databases current by itself
+	public class GeoOptions
+	{
+		public bool AutoUpdate { get; set; } = true;
+		public string DownloadBase { get; set; } = "https://download.db-ip.com/free";
+		public long MaxDownloadBytes { get; set; } = 300L * 1024 * 1024;
+		public long MaxDatabaseBytes { get; set; } = 1024L * 1024 * 1024;
+		//this server's place, when locating its own address would be wrong (behind a proxy or a CDN): the owner's call
+		public SelfGeoOptions Self { get; set; } = new();
+	}
+
+	public class SelfGeoOptions
+	{
+		public double? Latitude { get; set; }
+		public double? Longitude { get; set; }
+		public string City { get; set; }
+		public string Country { get; set; }
+	}
+
+	//owner decision: off by default (on in production since 2026-10-04); when on, one server a minute, each at most weekly, at most MaxHosts servers
 	public class CrawlerOptions
 	{
 		public bool Enabled { get; set; }

PrivaPub/Middleware/SocialPubConfigurations.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.Authentication.JwtBearer;
+using Microsoft.AspNetCore.Authentication.JwtBearer;
 using Microsoft.AspNetCore.ResponseCompression;
 
 using OpenIddict.Validation.AspNetCore;
@@ -41,7 +41,8 @@ namespace PrivaPub.Middleware
 		{
 			return service
 				.Configure<MongoSettings>(configuration.GetSection(nameof(MongoSettings)))
-				.Configure<AppConfiguration>(configuration.GetSection(nameof(AppConfiguration)));
+				.Configure<AppConfiguration>(configuration.GetSection(nameof(AppConfiguration)))
+				.Configure<PrivaPub.Infrastructure.RegistrationOptions>(configuration.GetSection("Registrations"));
 		}
 		public static IServiceCollection PrivaPubWorkersConfiguration(this IServiceCollection service)
 		{
@@ -60,9 +61,11 @@ namespace PrivaPub.Middleware
 					client.DefaultRequestHeaders.UserAgent.ParseAdd($"PrivaPub/{BuildInfo.Ref} (+{baseAddress}/)");
 				})
 				.ConfigurePrimaryHttpMessageHandler(provider =>
-					SafeHttpHandlerFactory.Create(provider.GetRequiredService<IOptions<FederationOptions>>().Value, provider.GetRequiredService<IConnectedAddresses>()));
+					SafeHttpHandlerFactory.Create(provider.GetRequiredService<IOptions<FederationOptions>>().Value, provider.GetRequiredService<IConnectedAddresses>()))
+				.AddHttpMessageHandler(provider => new EdgeHintsHandler(provider.GetRequiredService<IEdgeHints>()));
 			return service
 				.AddSingleton<IConnectedAddresses, ConnectedAddresses>()
+				.AddSingleton<IEdgeHints, EdgeHints>()
 				.AddSingleton<IFederationHttp, FederationHttp>()
 				.AddSingleton<IDomainBlocks, DomainBlocks>()
 				.AddSingleton<IContentRenderer, ContentRenderer>()
@@ -98,6 +101,8 @@ namespace PrivaPub.Middleware
 				.AddSingleton<IPollService, PollService>()
 				.AddSingleton<IQuoteService, QuoteService>()
 				.AddSingleton<IJobHandler, PollRefreshJob>()
+				.AddSingleton<IJobHandler, RecoveryJob>()
+				.AddSingleton<IJobHandler, Federation.Actors.AccountCountsJob>()
 				.AddSingleton<IJobHandler, PollCloseJob>()
 				.AddSingleton<InstanceDescriber>()
 				.AddSingleton<IJobHandler>(services => services.GetRequiredService<InstanceDescriber>())
@@ -107,8 +112,23 @@ namespace PrivaPub.Middleware
 				.AddSingleton<IJobHandler, DeliveryJobHandler>()
 				.AddHostedService<JobWorker>();
 		}
-		public static IServiceCollection PrivaPubStatisticsConfiguration(this IServiceCollection service, IConfiguration configuration) =>
+		public static IServiceCollection PrivaPubStatisticsConfiguration(this IServiceCollection service, IConfiguration configuration)
-			service
+		{
+			// not federation: the DB-IP download only (GeoUpdater), plain HTTPS to a fixed host
+			service.AddHttpClient(GeoUpdater.ClientName, (provider, client) =>
+			{
+				var baseAddress = provider.GetRequiredService<IOptionsMonitor<AppConfiguration>>().CurrentValue.BackendBaseAddress?.TrimEnd('/');
+				client.Timeout = TimeSpan.FromMinutes(15);
+				client.DefaultRequestHeaders.UserAgent.ParseAdd($"PrivaPub/{BuildInfo.Ref} (+{baseAddress}/)");
+			});
+			// not federation either: the CDNs' published address ranges (CdnUpdater), plain HTTPS to the CDNs' own hosts
+			service.AddHttpClient(CdnUpdater.ClientName, (provider, client) =>
+			{
+				var baseAddress = provider.GetRequiredService<IOptionsMonitor<AppConfiguration>>().CurrentValue.BackendBaseAddress?.TrimEnd('/');
+				client.Timeout = TimeSpan.FromMinutes(2);
+				client.DefaultRequestHeaders.UserAgent.ParseAdd($"PrivaPub/{BuildInfo.Ref} (+{baseAddress}/)");
+			});
+			return service
 				.Configure<StatisticsOptions>(configuration.GetSection("Statistics"))
 				.AddSingleton<InteractionSalts>()
 				.AddSingleton<InteractionLedger>()
@@ -116,10 +136,16 @@ namespace PrivaPub.Middleware
 				.AddHostedService(services => services.GetRequiredService<InteractionLedger>())
 				.AddSingleton<IJobHandler, RollupJob>()
 				.AddSingleton<IGeoLocator, DbIpLocator>()
+				.AddSingleton<ICdnRanges, CdnRanges>()
+				.AddHostedService<CdnUpdater>()
+				.AddSingleton<Domain.Statistics.ISelfLocation, Domain.Statistics.SelfLocation>()
+				.AddSingleton<Domain.Statistics.IServerPlaces, Domain.Statistics.ServerPlaces>()
+				.AddHostedService<GeoUpdater>()
 				.AddSingleton<Domain.Statistics.StatisticsQueries>()
 				.AddSingleton<IJobHandler, Federation.Crawler.CrawlPlanner>()
 				.AddSingleton<IJobHandler, Federation.Crawler.InstanceCrawler>()
 				.AddHostedService<StatisticsSchedule>();
+		}
 
 		public static IServiceCollection PrivaPubAuthServicesConfiguration(this IServiceCollection service, IConfiguration configuration)
 		{
@@ -171,6 +197,8 @@ namespace PrivaPub.Middleware
 			return service
 				.AddTransient<IDataService, DataService>()
 				.AddTransient<IRootUsersService, RootUsersService>()
+				.AddScoped<IRootSessions, RootSessions>()
+				.AddScoped<IRootRemoval, RootRemoval>()
 				.AddTransient<IPublicAvatarUsersService, PublicAvatarUsersService>()
 				.AddTransient<IPrivateAvatarUsersService, PrivateAvatarUsersService>()
 				.AddTransient<IGroupUsersService, GroupUsersService>()

PrivaPub/Models/Federation/GroupAnnouncement.cs

@@ -0,0 +1,15 @@
+using MongoDB.Entities;
+
+namespace PrivaPub.Models.Federation
+{
+	// An Announce a community sent (GroupDistributor), kept so its id resolves as both docs promise: announces are public,
+	// unlike follows, likes and blocks. Served only while the post it is about is still shown.
+	public class GroupAnnouncement : Entity
+	{
+		public string GroupId { get; set; }
+		public string ActivityURI { get; set; }
+		public string ObjectURI { get; set; }//the post it is about
+		public string Body { get; set; }//the Announce as sent, without @context
+		public DateTime PublishedAt { get; set; } = DateTime.UtcNow;
+	}
+}

PrivaPub/Models/Jobs/CdnRangeSet.cs

@@ -0,0 +1,15 @@
+using MongoDB.Entities;
+
+namespace PrivaPub.Models.Jobs
+{
+	// The address ranges one CDN publishes, as CdnUpdater last downloaded them: kept, so a restart needs no download and a
+	// failed download keeps the previous list.
+	public class CdnRangeSet : Entity
+	{
+		public string Key { get; set; }//the CDN's domain (CdnProvider.Key)
+		public string Name { get; set; }
+		public List<string> Ranges { get; set; } = new();
+		public List<string> Sources { get; set; } = new();
+		public DateTime FetchedAt { get; set; }
+	}
+}

PrivaPub/Models/Jobs/Job.cs

@@ -29,7 +29,9 @@ namespace PrivaPub.Models.Jobs
 		FetchPreview,
 		RollupDay,
 		CrawlPlan,
-		CrawlInstance
+		CrawlInstance,
+		SendRecovery,
+		CountAccount
 	}
 
 	public enum JobState

PrivaPub/Models/Jobs/RemoteInstance.cs

@@ -1,4 +1,4 @@
-using MongoDB.Entities;
+using MongoDB.Entities;
 
 namespace PrivaPub.Models.Jobs
 {
@@ -57,6 +57,8 @@ namespace PrivaPub.Models.Jobs
 		public int? Asn { get; set; }
 		public string AsnOrg { get; set; }
 		public string Cdn { get; set; }//the CDN in front of it, whose edge address says nothing about where it runs
+		public string CdnDomain { get; set; }//the CDN's own domain, which groups its servers (CdnProvider.Key)
+		public string CdnSource { get; set; }//how the CDN was found: "ranges", "headers" or "asn"
 		public bool? Ipv6 { get; set; }
 		public string Source { get; set; }
 		public DateTime? LocatedAt { get; set; }
@@ -79,8 +81,13 @@ namespace PrivaPub.Models.Jobs
 		public string RegistrationMode { get; set; }
 		public List<string> Languages { get; set; }
 		public string Country { get; set; }
+		public string City { get; set; }
+		public double? Latitude { get; set; }
+		public double? Longitude { get; set; }
 		public int? Asn { get; set; }
 		public string Cdn { get; set; }
+		public string CdnDomain { get; set; }
+		public string CdnSource { get; set; }
 		public bool? Ipv6 { get; set; }
 	}
 }

PrivaPub/Models/Post/Post.cs

@@ -1,4 +1,4 @@
-using MongoDB.Bson.Serialization.Attributes;
+using MongoDB.Bson.Serialization.Attributes;
 using MongoDB.Entities;
 
 namespace PrivaPub.Models.Post
@@ -39,6 +39,8 @@ namespace PrivaPub.Models.Post
 		[BsonIgnoreIfNull]
 		public EventDetails Event { get; set; }
 		[BsonIgnoreIfNull]
+		public PostPlace Place { get; set; }
+		[BsonIgnoreIfNull]
 		public PostPoll Poll { get; set; }
 		public List<float> Location { get; set; } = new();
 		public float RangeKm { get; set; } = 5.0f;

PrivaPub/Models/Post/PostDetails.cs

@@ -1,4 +1,4 @@
-namespace PrivaPub.Models.Post
+namespace PrivaPub.Models.Post
 {
 	public class CustomEmoji
 	{
@@ -104,6 +104,15 @@ namespace PrivaPub.Models.Post
 		public string Category { get; set; }
 	}
 
+	//a remote post's own place (Pixelfed's location): shown, never federated again
+	public class PostPlace
+	{
+		public string Name { get; set; }
+		public double Latitude { get; set; }
+		public double Longitude { get; set; }
+		public string Country { get; set; }
+	}
+
 	public class EventPlace
 	{
 		public string Name { get; set; }

PrivaPub/Models/User/Avatar.cs

@@ -87,6 +87,11 @@ namespace PrivaPub.Models.User
 		public DateTime? SuspendedAt { get; set; }
 		public DateTime? BannedAt { get; set; }
 		public DateTime? DeletionAt { get; set; }
+		public DateTime? ForgottenAt { get; set; }//its likes, votes, boosts and replies were taken out of our counts (GoneActors)
+		public int? FollowersCount { get; set; }//its own collections' totalItems, read at most daily (AccountCountsJob)
+		public int? FollowingCount { get; set; }
+		public int? StatusesCount { get; set; }
+		public DateTime? CountedAt { get; set; }
 	}
 
 	public class AvatarSettings

PrivaPub/Models/User/EmailRecovery.cs

@@ -5,7 +5,9 @@ namespace PrivaPub.Models.User
 	public class EmailRecovery : Entity
 	{
 		public string RootUserId { get; set; }
-		public string RecoveryCode { get; set; }
+		public string RecoveryCode { get; set; }//plaintext codes before 2026-10-04; migration _011 removed them, never written now
+		public string CodeHash { get; set; }//sha-256 of the code, hex; the code itself exists only in the email
+		public DateTime ExpiresAt { get; set; }
 		public string RequestIP { get; set; }
 		public DateTime CreationDate { get; set; } = DateTime.UtcNow;
 	}

PrivaPub/Models/User/RootUser.cs

@@ -23,6 +23,8 @@ namespace PrivaPub.Models.User
 		public DateTime CreatedAt { get; set; } = DateTime.UtcNow;
 		public DateTime UpdatedAt { get; set; } = DateTime.UtcNow;
 		public DateTime? DeletedAt { get; set; }
+		public DateTime? CredentialsChangedAt { get; set; }//when RootSessions last ended every session
+		public string SessionStamp { get; set; }//carried by every /clientapi token; a new one ends the tokens issued before
 	}
 
 	public class ContactItem

PrivaPub/Program.cs

@@ -1,4 +1,4 @@
-using Microsoft.AspNetCore.HttpOverrides;
+using Microsoft.AspNetCore.HttpOverrides;
 using Microsoft.Extensions.Options;
 
 using MongoDB.Bson;
@@ -59,7 +59,7 @@ try
 			.PrivaPubFederationConfiguration(builder.Configuration)
 			.PrivaPubStatisticsConfiguration(builder.Configuration)
 			.PrivaPubCORSConfiguration()
-			.PrivaPubRateLimiting()
+			.PrivaPubRateLimiting(builder.Configuration)
 			.PrivaPubOAuth(builder.Environment)
 			.AddScoped<PrivaPub.Api.Mastodon.Mappers.MastodonMapper>()
 			.AddScoped<PrivaPub.Api.Mastodon.Mappers.AccountSearch>()
@@ -87,12 +87,6 @@ try
 		EntityMaps.Warm();
 		await DB.Default.MigrateAsync<Program>();
 		await Indexes.Create();
-
-		if (args is ["admin", ..])
-		{
-			Environment.ExitCode = await AdminCommands.Run(args[1..]);
-			return;
-		}
 	}
 	catch (Exception ex)
 	{
@@ -111,6 +105,15 @@ try
 		throw;
 	}
 
+	// Commands get every service but start nothing: no Kestrel, no hosted services, no media directory. The deploy runs
+	// them as its own user, which can read the configuration and reach the private mongod but owns no www-data directory.
+	if (args is ["admin", ..])
+	{
+		using var scope = app.Services.CreateScope();
+		Environment.ExitCode = await AdminCommands.Run(args[1..], scope.ServiceProvider);
+		return;
+	}
+
 	try
 	{
 		var localizationService = app.Services.GetService<RequestLocalizationOptionsService>();
@@ -183,6 +186,7 @@ try
 		var passwordHasher = app.Services.GetService(typeof(IPasswordHasher)) as IPasswordHasher;
 		await dbClient.Init(passwordHasher);
 		await app.Services.GetRequiredService<PrivaPub.Federation.Moderation.IDomainBlocks>().Reload(CancellationToken.None);
+		await PrivaPub.Api.Mastodon.Auth.PersonaExchange.EnsureFirstPartyClient(app.Services, CancellationToken.None);
 	}
 	catch (Exception ex)
 	{

PrivaPub/Services/ClientToServer/Private/IPrivateAvatarUsersService.cs

@@ -73,7 +73,7 @@ namespace PrivaPub.Services.ClientToServer.Private
 				if (!await _localActors.TryReserveUserName(userName, LocalActorKind.Person, newAvatar.ID, default))
 					return result.Invalidate(_localizer["The username '{0}' is already take.", userName]);
 				if (form.Settings is { IsDefault: false })
-					newAvatar.Settings = ToSettings(form.Settings);
+					Apply(newAvatar.Settings, form.Settings);
 
 				var actor = _localActors.FromAvatar(newAvatar);
 				newAvatar.Url = actor.Uri;
@@ -116,7 +116,7 @@ namespace PrivaPub.Services.ClientToServer.Private
 				avatar.Fields = form.Fields ?? new();
 				avatar.PersonalNote = form.PersonalNote;
 				if (form.Settings != default)
-					avatar.Settings = ToSettings(form.Settings);
+					Apply(avatar.Settings ??= new(), form.Settings);
 				avatar.UpdatedAt = DateTime.UtcNow;
 				await DB.Default.SaveAsync(avatar);
 				await _outbox.PublishProfile(_localActors.FromAvatar(avatar), default);
@@ -158,18 +158,20 @@ namespace PrivaPub.Services.ClientToServer.Private
 				.Match(ru => !ru.DeletedAt.HasValue && !ru.IsBanned)
 				.ExecuteAnyAsync();
 
-		static AvatarSettings ToSettings(ViewAvatarSettings settings) => new()
+		// The client API carries only the theme; the rest (discoverable, locked, quote policy…) is set through the Mastodon API
+		// and must survive an edit made here.
+		static void Apply(AvatarSettings target, ViewAvatarSettings settings)
 		{
-			IsDefault = settings.IsDefault,
+			target.IsDefault = settings.IsDefault;
-			DarkThemeIndexColour = settings.DarkThemeIndexColour,
+			target.DarkThemeIndexColour = settings.DarkThemeIndexColour;
-			IconsThemeIndexColour = settings.IconsThemeIndexColour,
+			target.IconsThemeIndexColour = settings.IconsThemeIndexColour;
-			LanguageCode = settings.LanguageCode,
+			target.LanguageCode = settings.LanguageCode;
-			LightThemeIndexColour = settings.LightThemeIndexColour,
+			target.LightThemeIndexColour = settings.LightThemeIndexColour;
-			PreferSystemTheming = settings.PreferSystemTheming,
+			target.PreferSystemTheming = settings.PreferSystemTheming;
-			ThemeIsDarkGray = settings.ThemeIsDarkGray,
+			target.ThemeIsDarkGray = settings.ThemeIsDarkGray;
-			ThemeIsDarkMode = settings.ThemeIsDarkMode,
+			target.ThemeIsDarkMode = settings.ThemeIsDarkMode;
-			ThemeIsLightGray = settings.ThemeIsLightGray
+			target.ThemeIsLightGray = settings.ThemeIsLightGray;
-		};
+		}
 
 		ViewAvatar ToView(Avatar avatar) => new()
 		{

PrivaPub/Services/GroupUsersService.cs

@@ -210,6 +210,7 @@ namespace PrivaPub.Services
 					group.UpdatedAt = DateTime.UtcNow;
 					await DB.Default.SaveAsync(group, token);
 				}
+				await FollowAsMember(group, form.AvatarId, token);
 
 				result.Data = ToView(group, form.AvatarId);
 				return result;
@@ -221,6 +222,33 @@ namespace PrivaPub.Services
 			}
 		}
 
+		// Joining by invitation is following, as a local follow of the group would be: the member counts among its
+		// followers (so /groupies and /flock agree) and gets its posts in the home timeline.
+		async Task FollowAsMember(GroupEntity group, string avatarId, CancellationToken token)
+		{
+			var persona = await _localActors.FindById(LocalActorKind.Person, avatarId, token);
+			var target = _localActors.FromGroup(group);
+			if (persona == default)
+				return;
+			await DB.Default.Update<Follower>()
+				.Match(f => f.LocalActorId == group.ID && f.LocalActorKind == LocalActorKind.Group && f.ActorURI == persona.Uri)
+				.Modify(f => f.InboxURL, persona.Inbox)
+				.Modify(f => f.SharedInboxURL, persona.SharedInbox)
+				.Modify(f => f.IsAccepted, true)
+				.Modify(b => b.SetOnInsert(f => f.CreationDate, DateTime.UtcNow))
+				.Option(o => o.IsUpsert = true)
+				.ExecuteAsync(token);
+			await DB.Default.Update<Models.Social.Following>()
+				.Match(f => f.AvatarId == persona.Id && f.TargetActorURI == target.Uri)
+				.Modify(f => f.TargetAccountId, group.ID)
+				.Modify(f => f.TargetIsLocal, true)
+				.Modify(f => f.TargetInboxURL, target.Inbox)
+				.Modify(f => f.State, Models.Social.FollowState.Accepted)
+				.Modify(b => b.SetOnInsert(f => f.CreatedAt, DateTime.UtcNow))
+				.Option(o => o.IsUpsert = true)
+				.ExecuteAsync(token);
+		}
+
 		public async Task<WebResult> LeaveGroup(string rootUserId, GroupMembershipForm form, CancellationToken token)
 		{
 			var result = new WebResult();
@@ -238,6 +266,12 @@ namespace PrivaPub.Services
 				group.Members.RemoveAll(m => !m.IsForeign && m.AvatarId == form.AvatarId);
 				group.UpdatedAt = DateTime.UtcNow;
 				await DB.Default.SaveAsync(group, token);
+				// leaving is unfollowing, as joining was following
+				var groupUri = _localActors.FromGroup(group).Uri;
+				var personaUri = (await _localActors.FindById(LocalActorKind.Person, form.AvatarId, token))?.Uri;
+				await DB.Default.DeleteAsync<Models.Social.Following>(f => f.AvatarId == form.AvatarId && f.TargetActorURI == groupUri);
+				if (personaUri != default)
+					await DB.Default.DeleteAsync<Follower>(f => f.LocalActorId == group.ID && f.LocalActorKind == LocalActorKind.Group && f.ActorURI == personaUri);
 				return result;
 			}
 			catch (Exception ex)

PrivaPub/Services/IRootUsersService.cs

@@ -16,6 +16,7 @@ namespace PrivaPub.Services
 		Task<WebResult> UnbanUserAsync(UsersIds usersIds);
 
 		Task<WebResult> RemoveUserAsync(UsersIds usersIds);
+		Task<WebResult> RemoveSelfAsync(string rootId, string password);
 
 		Task<WebResult> UpdateUserAsync(UserForm userEmailForm, string userId);
 

PrivaPub/Services/JwtEvents.cs

@@ -28,9 +28,10 @@ namespace PrivaPub.Services
 				? default
 				: await context.HttpContext.RequestServices.GetRequiredService<DbEntities>().RootUsers.MatchID(rootId)
 					.ExecuteFirstAsync(context.HttpContext.RequestAborted);
-			if (root is not { IsBanned: false, DeletedAt: null })
+			var refusal = RootJwt.Refusal(root, context.Principal);
+			if (refusal != default)
 			{
-				context.Fail("The account can no longer be used.");
+				context.Fail(refusal);
 				return;
 			}
 			if (context.Principal.Identity is not ClaimsIdentity identity)

PrivaPub/Services/RecoveryJob.cs

@@ -0,0 +1,88 @@
+using MailKit.Net.Smtp;
+
+using Microsoft.Extensions.Localization;
+
+using MimeKit;
+
+using MongoDB.Entities;
+
+using PrivaPub.Infrastructure.Jobs;
+using PrivaPub.Models.Jobs;
+using PrivaPub.Models.User;
+using PrivaPub.Resources;
+
+using System.Security.Cryptography;
+using System.Text;
+using System.Text.Json;
+
+namespace PrivaPub.Services
+{
+	public sealed record RecoveryPayload(string RootUserId, string Host);
+
+	// Sends a password recovery link. Every request queues one of these, for an account that exists or not, so the answer
+	// to the request and its timing say nothing; SMTP's slowness and failures happen here, where nobody waits on them.
+	// The code exists only in the email: the database keeps its hash, for an hour.
+	public class RecoveryJob : IJobHandler
+	{
+		public const string Host = "recovery";
+		public static readonly TimeSpan CodeLifetime = TimeSpan.FromHours(1);
+
+		readonly AppConfigurationService _app;
+		readonly IStringLocalizer<GenericRes> _localizer;
+		readonly ILogger<RecoveryJob> _logger;
+
+		public RecoveryJob(AppConfigurationService app, IStringLocalizer<GenericRes> localizer, ILogger<RecoveryJob> logger)
+		{
+			_app = app;
+			_localizer = localizer;
+			_logger = logger;
+		}
+
+		public JobKind Kind => JobKind.SendRecovery;
+		public int Concurrency => 1;
+		public int MaxAttempts => 3;
+		public int PerHostLimit => 1;
+
+		public static string Hash(string code) => Convert.ToHexStringLower(SHA256.HashData(Encoding.UTF8.GetBytes(code ?? string.Empty)));
+
+		public async Task<JobOutcome> Handle(Job job, CancellationToken token)
+		{
+			var payload = JsonSerializer.Deserialize<RecoveryPayload>(job.Payload);
+			if (string.IsNullOrEmpty(payload?.RootUserId))
+				return JobOutcome.Done;//asked for an account that does not exist: there is nobody to write to
+			var user = await DB.Default.Find<RootUser>().MatchID(payload.RootUserId).ExecuteFirstAsync(token);
+			if (user is not { DeletedAt: null, IsBanned: false } || string.IsNullOrEmpty(user.Email))
+				return JobOutcome.Done;
+
+			var code = Convert.ToHexStringLower(RandomNumberGenerator.GetBytes(32));
+			await DB.Default.DeleteAsync<EmailRecovery>(r => r.RootUserId == user.ID);
+			await DB.Default.SaveAsync(new EmailRecovery { RootUserId = user.ID, CodeHash = Hash(code), ExpiresAt = DateTime.UtcNow + CodeLifetime }, token);
+
+			var email = _app.AppConfiguration.EmailConfiguration;
+			var message = new MimeMessage();
+			message.From.Add(new MailboxAddress("PrivaPub", email.SmtpUsername));
+			message.To.Add(MailboxAddress.Parse(user.Email));
+			message.Subject = _localizer["PrivaPub - Password recovery link"];
+			message.Body = new TextPart("plain")
+			{
+				Text = string.Format(_localizer[
+					"Hello,\n\nSomeone asked to reset the password of the PrivaPub login {0}. If it was you, open this link within an hour:\n{1}\n\nIf it was not you, ignore this email: nothing changes."],
+					user.UserName, $"{payload.Host}/password-recovery?rc={code}")
+			};
+			try
+			{
+				using var smtp = new SmtpClient();
+				await smtp.ConnectAsync(email.SmtpServer, email.SmtpPort, email.UseSSL, token);
+				await smtp.AuthenticateAsync(email.SmtpUsername, email.SmtpPassword, token);
+				await smtp.SendAsync(message, token);
+				await smtp.DisconnectAsync(quit: true, token);
+				return JobOutcome.Done;
+			}
+			catch (Exception ex) when (ex is not OperationCanceledException || !token.IsCancellationRequested)
+			{
+				_logger.LogWarning(ex, "The recovery email could not be sent");
+				return JobOutcome.Retry("smtp");
+			}
+		}
+	}
+}

PrivaPub/Services/RootJwt.cs

@@ -0,0 +1,53 @@
+using Microsoft.IdentityModel.JsonWebTokens;
+using Microsoft.IdentityModel.Tokens;
+
+using PrivaPub.Extensions;
+using PrivaPub.Models.User;
+using PrivaPub.StaticServices;
+
+using System.Security.Claims;
+using System.Text;
+
+namespace PrivaPub.Services
+{
+	// The /clientapi token: how it is validated (JwtBearer through AddPrivaPubAuth, and the persona token exchange on
+	// /oauth/token), and when a valid one can no longer be used. One place, so the two never drift apart.
+	public static class RootJwt
+	{
+		public static TokenValidationParameters Parameters(IConfiguration configuration) => new()
+		{
+			ValidateIssuer = true,
+			ValidateAudience = true,
+			ValidateLifetime = true,
+			ValidateIssuerSigningKey = true,
+			ValidIssuer = configuration["AppConfiguration:Jwt:Issuer"],
+			ValidAudience = configuration["AppConfiguration:Jwt:Audience"],
+			IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["AppConfiguration:Jwt:Key"]))
+		};
+
+		//why a token that validated can no longer be used, or default when it can: a token outlives a ban, a removal and a
+		//password recovery (RootSessions gives the root a new stamp), so the database has the last word
+		public static string Refusal(RootUser root, ClaimsPrincipal principal)
+		{
+			if (root is not { IsBanned: false, DeletedAt: null })
+				return "The account can no longer be used.";
+			if ((root.SessionStamp ?? string.Empty) != (principal.FindFirst(AuthTokenManager.SessionStamp)?.Value ?? string.Empty))
+				return "The account's sessions were ended.";
+			return default;
+		}
+
+		//the root a token belongs to, when the token is valid and can still be used; default otherwise, never an exception
+		public static async Task<RootUser> Root(string jwt, IConfiguration configuration, DbEntities dbEntities, CancellationToken token)
+		{
+			if (string.IsNullOrEmpty(jwt))
+				return default;
+			var result = await new JsonWebTokenHandler { MapInboundClaims = false }.ValidateTokenAsync(jwt, Parameters(configuration));
+			if (!result.IsValid)
+				return default;
+			var principal = new ClaimsPrincipal(result.ClaimsIdentity);
+			var rootId = principal.GetUserId();
+			var root = string.IsNullOrEmpty(rootId) ? default : await dbEntities.RootUsers.MatchID(rootId).ExecuteFirstAsync(token);
+			return Refusal(root, principal) == default ? root : default;
+		}
+	}
+}