myanime-backend

PocketBase backend for the myanime app — auth, database, realtime, file storage and admin UI in a single Go binary. This is the foundation the account features build on: cloud sync, codeless device sign-in, profiles, child profiles, recommendations, and gated auto-update (epic #6).

• No E2E. TLS in transit + at-rest on disk. The server is deliberately readable so recommendations, the admin nsfwEnabled flag, and painless password reset all work.
• Schema as code. The collections live in pb_migrations/ and auto-apply on boot — never hand-click the schema in the admin UI, or the next deploy will drift.
• Version-pinned. The Dockerfile downloads the official PocketBase v0.39.6 static binary from GitHub releases (no third-party image). Bump PB_VERSION there and in docker-compose.yml to upgrade.

Data model

users ─┬─* profiles ─┬─* watch_state   (resume points; 1 row per profile+item)
 (auth)│             ├─* watchlist      (1 row per profile+item)
       │             ├─1 prefs          (playback/audio/subtitle blob)
       │             └─1 addon_config   (client-encrypted addon blob; ciphertext only)
       └ nsfwEnabled (admin-only bool → gates adult vs clean build, issue #16)

Collection	Type	Key fields
users	auth	username (unique when set), email, password, nsfwEnabled (admin-only)
profiles	base	user→users, name, avatar (file), isChild, pinHash (hidden)
watch_state	base	profile→profiles, itemId, itemType, position, duration, meta (json), updatedAt (client), updated (server)
watchlist	base	profile→profiles, itemId, itemType, meta (json), addedAt (client), updated (server), deletedAt (tombstone)
prefs	base	profile→profiles, data (json), updatedAt (client), updated (server)
addon_config	base	profile→profiles, blob (ciphertext), salt, kdf, updatedAt (client), updated (server)

Access rules. A user only ever reads/writes their own users row, their own profiles, and rows whose profile.user is them. nsfwEnabled is never accepted from a client (@request.body.nsfwEnabled:isset = false on create and update) — only a superuser sets it, from the admin UI. Relations cascadeDelete, so deleting a user removes their profiles and all child rows. Unique indexes keep one resume/watchlist row per (profile, itemId) and one prefs/addon_config row per profile.

Encrypted addon config (issue #20)

The addon_config blob is the one piece of account data that is not readable by the server. The addon "tokens" are base64'd plaintext credentials (prehraj.to login, TorBox API key) plus the TMDB key, so — unlike watch history — they are encrypted client-side before upload. The server stores only:

• blob — AES-GCM ciphertext (nonce ‖ ciphertext ‖ tag), base64; opaque here.
• salt — the per-account KDF salt (base64). Not secret; a salt never is. It lives server-side so a second device can derive the same key from the user's password. The key itself is never sent and never leaves the device.
• kdf — the key-derivation descriptor (e.g. pbkdf2-sha256-210000).

Because the key is derived from the password, a password reset (done on PocketBase's hosted page, off-device) leaves the blob undecryptable — expected and acceptable for re-enterable addon config, and the client detects it, clears it, and prompts a re-entry. A normal in-app change password re-encrypts the blob, so only reset loses it. This does not change the no-E2E stance for the rest of the data.

The two clocks (issue #11)

Sync rows carry two timestamps, and they are not interchangeable:

• updatedAt / addedAt — set by the client. When the user actually acted. This is what resolves conflicts (last-write-wins). It has to be the client's, because a device that edits offline on Monday and pushes on Friday must not beat a device that edited on Tuesday and synced immediately.
• updated — a server autodate. When we heard about it. This is the pull cursor (filter=updated > {lastCursor}). It has to be the server's: a device with a skewed clock would otherwise stamp rows behind another device's cursor and stay invisible to it forever.

itemId encodes the client's local key — anime:<anilistId>:<episode>, movie:<tmdbId>:0, tv:<tmdbId>:<seasonEpisodeKey> — so the unique (profile, itemId) index is what makes a push idempotent. meta is an opaque JSON blob of the client's display fields (title, cover art, episode, flags); the server never reads into it.

Deletes are soft. A watchlist removal sets deletedAt rather than deleting the row, because an absence is not something another device can pull — it would just re-push the title and resurrect it. Re-adding clears deletedAt on the same row, so a delete/re-add round-trip can never leave a duplicate.

Local run / verify

docker compose up --build            # http://localhost:8090
# create the first superuser (one-time):
docker compose exec pocketbase pocketbase superuser upsert you@example.com 'a-strong-pass' --dir=/pb_data
# admin UI: http://localhost:8090/_/

The end-to-end access-rule check (two users can't see each other's data; a user can't set their own nsfwEnabled; a superuser can) lives in scripts/verify.py:

python scripts/verify.py            # expects the server on :8090 + the superuser above

Deploy on Coolify

The schema and image are automated; the steps below need your hands, Coolify access and secrets (which never live in this repo).

1. Push this repo to a remote Coolify can reach (e.g. GitHub, like myanime-pair-server).
2. New Resource → Dockerfile application, point it at this repo. It listens on 8090.
3. Persistent storage: add a volume mounted at /pb_data (DB + uploaded files). Without this you lose data on redeploy.
4. Domain + TLS: set the domain to pb.petruzalekr.cz; Coolify/Traefik provisions the Let's Encrypt cert and terminates TLS in front of the plain :8090. Force-HTTPS on.
5. Bootstrap the superuser once, from the container terminal: pocketbase superuser upsert you@example.com 'a-strong-pass' --dir=/pb_data (or open the printed /_/#/pbinstall/... link on first boot). Lock down the admin UI — strong password; the _superusers collection is the only way in.
6. SMTP (admin UI → Settings → Mail settings): point at your SMTP host so verification / password-reset emails send. Send the test email to confirm.
7. Automated backups (admin UI → Settings → Backups): enable the schedule and, ideally, S3 off-site upload. Coolify volume backups are a second layer.
8. App wiring (later issues, not here): point the app's API base at https://pb.petruzalekr.cz.

Verify the deploy

• Admin UI reachable over HTTPS only; HTTP redirects up.
• Create a test user + profile + a couple of rows via admin or REST; confirm a second user can't read them (run scripts/verify.py against the live URL by editing BASE).
• Trigger a password-reset email and confirm delivery.
• Confirm a backup ran and can be downloaded/restored.

Security

Account/session tokens and the addon plaintext-credential "tokens" are never logged or echoed (see the app's CLAUDE.md). pinHash is a hidden field and never leaves the API. nsfwEnabled is admin-only by rule, not just by UI.

Upgrading PocketBase

Bump PB_VERSION in the Dockerfile (and the compose arg), rebuild, redeploy. Check the PocketBase release notes for migration-API or schema changes first, and test locally with docker compose up --build before deploying.