SocialPub/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
per-platform evidence behind phases P5 to P8: what each peer sends, what it expects, and what PrivaPub still drops.
Check the platform's section there before writing a parser or a renderer, and add to it whatever you learn.

## What this is

**PrivaPub** (repo name SocialPub) is a self-hosted ActivityPub server in C#, live at https://privapub.thepra.dev.
It is meant as a Pleroma-like microblogging server for privacy-minded people and small communities, federating with
Mastodon, GoToSocial, Pleroma/Akkoma, Misskey and Lemmy.

Its defining idea: **one private login owns several public personas.**

- **`RootUser` is the private login.** Username, password, optional email (used only for recovery), policies.
- **`Avatar` is a public persona.** Each one is an ActivityPub actor with its own RSA keys at `/peasants/{username}`.
  Root and avatar are linked only through `RootToAvatar`.
- **Personas must stay unlinkable** to other users and servers; only the instance admin can see the link.
- **`Group` is an ActivityPub Group actor.** It has members, an invitation code and an optional password. Groups are
  becoming two kinds: a public **community** (FEP-1b12, Lemmy-compatible) and a private, invitation-only **circle**.
- **`DmGroup` is a direct-message conversation.**
- **`privapub` is the instance actor** (type Application). It signs fetches no persona should be tied to.

Privacy features in the model:
- location-ranged posts (`Post.Location`, `RangeKm`), to become local-only and never federated;
- contacts a persona can share (`Avatar.SharedPersonalContacts`);
- private notes (`RootUserNote`, `PersonalNote`).

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
server.

## Route names are deliberate

The odd names are the owner's and part of the project's character. **Never "fix" them to conventional ones.** A new
actor-scoped route gets a name in the same spirit, agreed with the owner, and a name is frozen once it has federated.

| Thing | Route |
|---|---|
| Actor | `/peasants/{name}` (`/users/{name}` 301-redirects here; browsers are sent to `/@{name}`) |
| Inbox | `/peasants/{name}/mouth` |
| Outbox | `/peasants/{name}/anus` (`?page=true[&max_id=]` for pages) |
| Shared inbox | `/human-centipede` (also `/peasants/{name}/human-centipede`) |
| Followers | `/peasants/{name}/groupies` |
| Following | `/peasants/{name}/stalking` |
| Notes | `/peasants/{name}/scribbles/{id}` |
| Activities | `/peasants/{name}/grunts/{id}` (`create-{postId}` resolves) |
| DM context | `/peasants/{name}/whispers/{id}` |
| Token refresh | `/clientapi/user/sniff/again` |

Agreed for later phases: `/gossip`, `/drool`, `/echoes` (replies, likes, shares), `/trophies` (featured), `/tattoos`
(featured tags), `/flock` and `/wardens` (group members and moderators).

Routes other software looks up by name stay conventional:
- `/.well-known/*` and `/nodeinfo/*`;
- `/api/v1/*` and `/oauth/*`;
- `/@{name}` pages;
- `/media/*`.

## Repo map

```
PrivaPub.sln
PrivaPub/                         ASP.NET Core Web API, net10.0
  Program.cs                      host, Mongo init (GUIDs Standard), pipeline, /build.json
  Middleware/SocialPubConfigurations.cs   every DI registration (auth, federation, services, swagger, CORS)
  Controllers/ClientToServer/     /clientapi/*: RootUser (signup/login/invitations/recovery), PrivateAvatar,
                                  Group, Post (posts + DMs), Admin, Data
  Infrastructure/
    Http/                         FederationHttp + SafeHttpHandlerFactory + IpRangeGuard: the only way out
    Jobs/                         JobQueue (leases), JobWorker, Backoff, HostCircuitBreaker
    Ids/                          PrivacyIds (day-only ids for personas and groups, arrival-ordered ids for remote posts)
    Data/                         Indexes (created at start), EntityMaps.Warm, Migrations/_NNN_*.cs
    Cli/                          AdminCommands (`PrivaPub admin promote|demote <root>`)
    RateLimiting.cs               accounts (per client address) and inbox (per sending origin) policies
  Federation/
    Controllers/                  PeasantsController (actor, outbox, followers, following, posts, inboxes),
                                  WellKnownController (webfinger, nodeinfo), UsersController (redirect)
    Actors/                       LocalActorService (LocalActor, Keys, ReservedName), RemoteActorService
                                  (authoritative fetch, key verification, WebFinger), ActorDocument (parser)
    Objects/                      Origin, ActivityJson, NoteParser, Addressing, ContentSanitizer
    Moderation/                   DomainBlocks (suspend / silence / reject media)
    Signing/                      HttpSignatures (draft-cavage sign/verify)
    Inbox/                        InboxReceiver (verify, queue, 202) → InboxProcessor (job) → Handlers/{Follow,Accept,Reject,
                                  Undo,Create,Update,Delete,Like,Announce}; RemotePosts (build, fetch parents, FetchAncestors)
    Outbox/                       OutboxPublisher (who a post goes to), DeliveryService (queues jobs) + DeliveryJobHandler
    Rendering/                    ActivityPubRenderer (Mastodon @context, actors, notes, collections)
  Domain/
    Content/                      ContentRenderer (Markdown or plain text → HTML with h-card mentions and hashtags)
    Social/                       FollowService (local in-process, remote Follow/Accept), Notifications
    Timelines/                    Fanout (TimelineEntry rows, Mastodon's home rules), TimelineService
    Privacy/                      VisibilityPolicy (IsPublic expression, CanSee)
    Relationships/                RelationshipService (blocks, mutes, account domain blocks; Hidden), ReportService
    Media/                        MediaService (libvips, ffmpeg remux, blurhash), MediaProxy, MediaJanitor
  Domain/Statuses/                StatusService: publish, edit, remove, favourite, reblog, for a persona (both client APIs use it)
  Api/Mastodon/
    Auth/                         OpenIddict setup (keys in Mongo), MastodonScopes, TokenController, OAuthPruner
    Infrastructure/               MastodonController (avatar context, scopes, errors, Link), MastodonParams, MastodonJson, Page
    Entities/ Mappers/            Mastodon entities; MastodonMapper (Account, Status), AccountSearch
    Controllers/                  apps, instance, accounts, statuses, timelines, notifications, search, stubs
  Web/Pages/                      Razor: /@{user}, /@{user}/{id} (public posts only, strict CSP, noindex);
                                  OAuth/: /oauth/login (root password), /oauth/authorize (choose persona, consent)
  Services/                       RootUsersService, GroupUsersService, PostsService, AppConfigurationService, …
  Models/                         Mongo entities: User/, Group/, Post/, Federation/, Jobs/, AppConfiguration
  StaticServices/                 DbEntities (Find<T> accessors), AuthTokenManager (JWT), PasswordHasher
  Data/InitDb.cs                  first-run seeding (languages)
PrivaPub.ClientModels/            DTOs + validation resources shared with clients
PrivaPub.Tests/                   xUnit v3; Support/ has a fake two-origin peer and a throwaway-database fixture
deploy/                           nginx vhost, systemd units (privapub, privapub-mongod), max/setup.sh
.gitea/workflows/                 build.yml (push) · deploy.yml (tag v*)
docs/ROADMAP.md                   decisions + phased plan
```

The roadmap moves code towards `Infrastructure/`, `Federation/`, `Domain/`, `Api/{ClientApi,Mastodon}` and `Web/`,
one pure-move commit at a time.

## Commands

```bash
dotnet build PrivaPub.sln -c Release
dotnet test PrivaPub.sln                                  # unit tests; integration tests skip
PRIVAPUB_TEST_MONGOD=1 dotnet test PrivaPub.sln           # all of them, against mongod on 127.0.0.1:27017
                                                          # (PRIVAPUB_TEST_MONGO overrides; a fresh database per run, dropped after)
cd PrivaPub && ASPNETCORE_ENVIRONMENT=Development \
  Kestrel__Endpoints__Http__Url=http://127.0.0.1:6970 Kestrel__Endpoints__Http__Protocols=Http1AndHttp2 \
  AppConfiguration__BackendBaseAddress=http://127.0.0.1:6970 MongoSettings__Database=PrivaPubTest \
  dotnet run                      # needs a local mongod on 27017; swagger at /swagger
```

Development config (`appsettings.Development.json`) binds HTTPS 7195 with HTTP/2 only; the overrides above make it
curl-able. Outbound fetches only go to https DNS names resolving to public addresses; a test network (Pasture) sets
`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):

```bash
cd /var/www/privapub.thepra.dev && sudo -u www-data ASPNETCORE_ENVIRONMENT=Production ./PrivaPub admin promote <root>
```

## 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.
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
   document's `id` to be the URL it was served from (a same-origin alias is followed once). A key is accepted only if
   the actor lists it, its `owner` is the actor and it shares the actor's origin.
4. **Inbound inboxes verify everything before acting:**
   - the signature covers `(request-target)`, `host`, `digest` and `date` or `(created)`;
   - the Digest matches the body and the date is at most an hour old and fifteen minutes ahead;
   - the signature verifies against the key owner's key, and the activity's `actor` is the key owner;
   - the activity's `id`, and any object it creates, updates or deletes, is on the actor's origin; a cross-origin
     object is refetched from its own origin.
5. **Status codes:**
   - bad or missing signature: **401**;
   - malformed or forged body: **400**;
   - accepted: **202**;
   - over the rate limit: **429**;
   - **never 500** from `/peasants` or an inbox. Peers retry or "double-knock" based on these codes.
6. **Actor documents:**
   - served as `application/activity+json`;
   - `publicKey` is an SPKI PEM at `{actor}#main-key`, with `owner` equal to the actor's id;
   - the shared inbox is advertised in `endpoints.sharedInbox`.
7. **Remote HTML is sanitized before it is stored** (`ContentSanitizer`); `Post.ContentHtml` is what is shown,
   `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
   (`SignedFetchAuthorizer`), 404 otherwise. Circles never appear in search, lookups, mentions or profile pages.
   **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.
9. **A DM joins a conversation only by `DmGroup.ParticipantsKey`**, the exact set of its participants; a remote
   `context` decides nothing. DMs are `Post`s with `Visibility = Direct` and a `ConversationId` (`DmPost` is legacy).
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`.
12. **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
    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.
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
   from a conditional must say `(int?)null`, not `default`: that bug once made every list one item long.
4. Answer with `Json(...)` (snake_case, explicit nulls) or `Error(status, message)`; page lists with `Page` and `Link`.
5. Unsupported features answer empty lists or 422 with a message, never 404 or 500, so clients degrade.
6. Advertise `4.2.0 (compatible; PrivaPub)` until grouped notifications exist.
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
   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.

## Media invariants

1. **No upload keeps its metadata.** Images are re-encoded by libvips with `keep=none`; audio and video are remuxed with
   `-map_metadata -1`. `MediaProcessingTests` checks EXIF and XMP are gone.
2. Files live under `Media:Root` (`/var/lib/privapub/media`), never in the published directory; the proxy cache is the
   sibling `media-proxy`, which `/media/files` does not serve.
3. **A client never contacts a remote server for media:** every remote URL the API returns goes through
   `IMediaProxy.Wrap`, an HMAC-signed `/media/proxy/` URL fetched by `IFederationHttp.GetMedia`.

## Privacy invariants

- **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).
- **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
  they are saved; `LocalActorService.TryReserveUserName` is the only way to claim one.
- **Usernames are `Constants.UserNameRegex`** (`^[a-z0-9_]+$`): the intersection of what Mastodon and Misskey accept. A
  name outside it creates a persona nobody on those servers can reach.
- **An actor's `published` is `PublishedOn`**, a random whole day up to two weeks before creation, so personas made the
  same day do not share a date. New persona and group ids carry that same day (`GenerateNewID`), because local clients
  see ids. Never emit `CreatedAt`.
- **Per-avatar state stays per avatar:** blocks, mutes, notifications, follows. Nothing may relate sibling avatars.
- **Blocks federate** (owner decision, 2026-10-01): a block is sent as `Block` from the blocking avatar, an unblock as
  `Undo{Block}`. Reports still leave as `Flag` from the instance actor, never from the reporting avatar.
- **What PrivaPub reveals is the owner's call.** Previews, blocks, website authorship, views, bridging and reactions were
  decided in `docs/ROADMAP.md` ("Owner decisions on what PrivaPub reveals"). Anything new that tells another server
  something about an avatar gets the same treatment: ask, then record it there.
- **Location-ranged posts never federate.**

## Data

- MongoDB through **MongoDB.Entities 25.1**, instance API: `DB.Default.Find<T>()`, `.SaveAsync(e)`, `.Update<T>()`,
  `.DeleteAsync<T>()`, `.CountAsync<T>()`. `DbEntities` wraps the finds.
- **Pass no cancellation token to `DeleteAsync` outside a transaction;** v25 throws if you do.
- **Collection name = class name, so never rename an entity class.**
- `Entity.ID` is a 24-character lowercase hex string; `GenerateNewID()` returns `object`, so cast it.
- New fields must be additive: a deploy rollback restores the binary, not the database.
- **Every stored remote object has an `ObjectRecord`** (raw JSON up to 256 KB plus its hash; delivered or fetched; the
  activity, inbox, key and signed headers; received time; up to 10 later revisions). Write it right after the post's
  save: `CreateHandler` (delivered) and `RemotePosts.StoreContext` (fetched) do, and `UpdateHandler` appends a
  revision. Delivery details reach them through `Arrival.Current`, which `InboxProcessor` sets for the handler's
  duration. 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`.
- **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** (`UpdateHandler.IsEdit`). 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).
- **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`).
- **A server is described on arrival, never on read.** The first record from a host enqueues `DescribeInstance` (its
  NodeInfo, at most once a week, into `RemoteInstance`), so opening the details view tells nobody anything.
- **Post ids are the timeline order, so they follow arrival, not `published`.** `PrivacyIds.Arrived` gives a remote post
  published within the last hour (or in the future) a fresh `ObjectId`, which sorts after every post already stored,
  and only backfill keeps a `published`-derived id. With `published` ids a reply arriving in the same second could sort
  under the post it answers, and a late arrival landed behind a client's `since_id` and was never seen. `created_at`
  comes from `CreationDate`, never from the id.
- **The same ordering problem exists on the other side, so `published` carries milliseconds**
  (`ActivityPubRenderer.Timestamp`). GoToSocial (ULIDs) and Mastodon (Snowflakes) derive a remote status's id from
  `published` at millisecond resolution. With whole seconds, two of our posts from the same second sorted at random
  there.
- **Startup order:** `EntityMaps.Warm()` (every entity's class map, one at a time; two mapped at once throw "An item
  with the same key has already been added" and stay broken), then `MigrateAsync` (`Infrastructure/Data/Migrations`,
  `_NNN_` order, each runs once), then `Indexes.Create()`. A new entity needs nothing; a new unique index needs a
  dedupe migration before it.
- Production runs its **own mongod** on 127.0.0.1:27022 (unit `privapub-mongod`, no auth, data in
  `/var/lib/privapub/mongo`). The box's shared mongod needs credentials nobody here has.

## Code style

- Tabs, block-scoped namespaces, Allman braces.
- New services use `readonly _camel` fields and constructor injection. Older services use PascalCase fields; leave
  them.
- Services return `WebResult` (`PrivaPub.ClientModels/WebResult.cs`): `result.Invalidate(localizer[...], status)`.
  Controllers turn it into a status code.
- Localised strings go through `IStringLocalizer<GenericRes>`.
- Every `Display`/`ErrorMessage` resource key must exist in `FieldsNameResource`/`ErrorsResource`, including the
  `Designer.cs`, which the CLI build doesn't regenerate. A missing key throws at validation time.
- **`cond ? value : default` with a value-type branch is the type's default, not null:** `false`, `0`, or year one
  stored as an edit date on every remote post. Write `(T?)null`. It has shipped four times (`MastodonParams.Bool/Int`,
  `NoteParser.Int`, `NoteParser.Time`).
- ActivityPub output is built with `System.Text.Json.Nodes` in `ActivityPubRenderer`, not typed models. Inbound
  documents are read through `InboxService.Id`/`Value`, which handle string, object and array.
- Libraries chosen for the roadmap: HtmlSanitizer, Markdig (`DisableHtml`), NSign (RFC 9421 inbound), OpenIddict +
  OpenIddict.MongoDb, NetVips, Blurhash.Core, FFMpegCore. No ImageSharp (licence key enforced), no MassTransit.

## Testing

`PrivaPub.Tests` (xUnit v3). Unit tests need nothing; tests marked `Category=Integration` need a mongod and skip
without `PRIVAPUB_TEST_MONGOD=1`. CI runs the unit tests only (the box's mongods are production).

- `Support/Peer` is an in-process HTTP server answering on two origins (`127.0.0.1` and `localhost`), so origin rules
  can be tested; `Support/RemoteActor` signs real deliveries with its own key.
- Inbox scenarios go through `InboxService.Receive` with a signed request, not through the private handlers.

Beyond the tests, verify by building, running locally, and exercising:
- the client API (sign up, create an avatar, a group, a post);
- the ActivityPub endpoints with curl and `Accept: application/activity+json`.

Interop is checked against real servers, starting with the workstation's own pasture:

```bash
DOTNET=~/.dotnet/dotnet tools/pasture/run.sh up   # podman: PrivaPub + the latest GoToSocial + Mongo, behind Caddy
tools/pasture/interop.sh                          # 25 checks, each side driven through its own Mastodon API
tools/pasture/run.sh down
```

- **Two sites on one podman network, one Caddy in front.** `privapub.test` and `gts.test` are network aliases of the
  Caddy container, which serves both with its internal CA (`tls internal`). Both servers are told to accept any
  certificate: PrivaPub through `appsettings.Pasture.json`, GoToSocial through `GTS_HTTP_CLIENT_TLS_INSECURE_SKIP_VERIFY`.
  GoToSocial WebFingers and fetches over https only, so plain http between them is not an option.
- From the workstation, PrivaPub's API is `http://127.0.0.1:6971`. GoToSocial is reached as `https://gts.test:6443`
  with `curl -k --resolve gts.test:6443:127.0.0.1`, because its sign-in cookie is bound to the host name.
- **GoToSocial's cached home timeline can stop taking new posts after its first read**, its owner's own included, while
  a `min_id` query shows them all. So a delivery is checked by looking the object up by URI with `resolve=false`
  (`on_gts`), which answers from GoToSocial's database and never fetches from us. A home-timeline check there proves
  nothing, in either direction. A deleted status still turns up in that search as a "deleted status" stub, so a delete
  is checked as a 404 on `/api/v1/statuses/{id}`.
- **GoToSocial creates its accounts locked**, so `interop.sh` approves alice's request through
  `/api/v1/follow_requests`. That also checks our pending (`requested`) state and the manual Accept.
- The scenario covers:
  - discovery and follows both ways;
  - posts and CW;
  - a reply and its notification;
  - likes and boosts both ways;
  - DMs both ways, and the DM staying off public timelines;
  - edit, delete both ways, and unfollow.
- `run.sh up` replaces every container, Mongo included, so each run starts clean. To keep the data, republish into
  `tools/pasture/.publish` and `podman restart pasture-privapub`; that is how a migration is tried on dirty data.

After the pasture, verify.funfedi.dev and the owner's GoToSocial at social.arasaka.software. **Ask before acting from
the owner's GoToSocial account.**

## Deploy

- **CI/CD:** push to `master` runs `build.yml` (build + tests) on the instance-wide `build` runner. A `v*` tag runs
  `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).
- **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`.
- **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
  copy afterwards, so changing those keys needs a Mongo update as well.
- **Logs:** `journalctl -u privapub`, plus the `logs` database on the private mongod.