peter
f569b19c49
Deep-review round 2 over main..improvement/watch-background-audio. Account resolution (server) - A request naming an account that is no longer signed in to this browser (X-Siftlode-Account or ?account=) now acts as nobody instead of the session's default account. A tab still pinned to an account signed out in another tab went on acting as the default: its player checkpoints and preference saves landed in that account, the messages socket and Plex playback ran as it, and its Sign out signed THAT account out. A hidden tab never polls /api/me, so a tab playing in the background kept doing it. The /api/me bootstrap probe alone keeps the fallback, which is how such a tab learns who it now is: the app's 401 handler reloads, and BootGate re-pins the tab. BootGate - On an identity change the tab reloads without moving its pin first. The tree being torn down still runs its unmount saves before the page goes, and with the pin already moved they wrote into the new account's local keys (a player volume still pending). The reloaded page corrects the pin. Share page (/watch) - Only a 404 says the link is gone. A 5xx, a dropped connection, and the unlock's own rate limit all rendered "no longer available ... expired or revoked" to a viewer with a valid link, with no way to try again. A load failure now offers Retry; too many password tries says so and keeps the form; an unlock that gets no answer says so instead of doing nothing. Strings in en/hu/de. Downloads - A cookie-authed asset is recognised under the current signature version and the one before it, so a job queued before a deploy that bumps the version still downloads with its cookie instead of failing on the login wall with an error that says no cookie was used. The app chunk is preloaded through lazyWithPreload, so a failed fetch no longer leaves an unhandled rejection beside the ErrorBoundary. The panel layout seed is one helper (seedLayout). Tests: the stale-tab refusal, its harmless Sign out and the probe fallback; the pre-bump authed asset; BootGate keeping the pin on reload and staying mounted through a same-account change; the reveal clock's later-commit hand-off; the prefs, panel layout and demo-scope seeds from the me cache; the share page's failure states. Each mutation-checked RED for its own reason.
Backend conventions
The rules below are already followed across backend/app — they lived only in a few module
docstrings (demo.py, userscope.py, routes/_common.py) until this file collected them (E3 S3,
B-core-20). When you add code, match these so the next reader doesn't have to guess "which pattern do
I copy".
Module layering
Three layers, by who runs the code — not by feature:
-
routes/…— request-only. A route module holds HTTP concerns: auth dependencies, request/ response models, status-code mapping, serialization. It owns logic that runs only on a request. Business logic that a request happens to trigger does not live here if anything else runs it too. -
plex/,downloads/,sync/— domain logic shared by more than one caller. Anything the scheduler or the worker runs (not just a request) lives in one of these domain packages, so the route, the worker, and the scheduler share one definition. Examples from this codebase:downloads/service.pyowns enqueue + the job state transitions (routes call it);plex/sync.pyis run by both the admin route and the scheduler;downloads/pipeline.pyis the worker's child pipeline. -
Flat
app/*.pycore modules — cross-cutting primitives.auth,sysconfig,quota,audit,notifications,userscope,realtime,ratelimit,progress, … are single-file primitives many layers import. They depend on nothing above them (a core module must never import aroutes/…module).
Extraction trigger: the SECOND consumer. Keep new logic inline in its first caller. The moment a second caller needs it (a worker as well as a route; a scheduler as well as a route), extract it down a layer — into the relevant domain package, or a flat core module if it's cross-cutting. Don't pre-abstract for a single caller; don't leave shared logic duplicated once there are two.
Transaction ownership
This follows CLAUDE.md's canonical rule verbatim — "the handler/job-wrapper commits; helpers flush
(only quota owns its session)" — so read it that way, not as an exception to it. The commit belongs
to the operation owner; anything called inside another transaction only stages its change
(db.add / flush) and lets the owner commit, so the whole operation is one transaction.
audit.record() is the reference: it adds the audit row and the caller commits it together with the
mutation it records, so an audit entry can never exist without its change (or vice-versa).
- The operation owner is usually the route handler. A
service.*operation the handler delegates a whole transition to (e.g.service.cancel) is that owner and commits its one transition — it isn't a mid-operation helper. A helper that owns its OWN short-lived session (the worker'sjobdbwrites, the same carve-out CLAUDE.md grantsquota) commits that session. Everything else flushes. SessionLocalisexpire_on_commit=False: after a rawUPDATE+ commit, an ORM object you already loaded is stale. Read the fresh value from the row (RETURNING, or a re-SELECT), not the ORM attribute — seeservice.decr_ref_count.
Shared counters and status: do it atomically at the DB
- Never read-modify-write a shared counter in Python (
x.count = x.count + 1). Concurrent sessions lose an update. Use a DB-atomic statement —col = col + 1, orgreatest(col - 1, 0)withRETURNINGso the caller branches on the post-value under the row lock (service.incr_ref_count/decr_ref_count). - Download job status is a
JobStatusStrEnum (downloads/status.py), not bare strings. TheHOLDINGset defines which states hold aMediaAsset(so release accounting stays correct);STOPPED_BY_ROUTEis the route-initiated stop set. A worker child's terminal write goes throughservice.finalize_if_running(an atomicUPDATE … WHERE status='running') so a finishing child can't resurrect a job a route just stopped.
Config: one home per kind
app.config.settings— boot/env config (DB URL, download root, worker concurrency): read once at startup, not user-tunable at runtime.sysconfig.SPECS— the runtime admin knobs (DB-override-or-default). A new admin-tunable value goes inSPECS; don't invent a fourth store. (state.py'smaintenance_batchpredates this and is slated to fold intosysconfig— do not add more like it.)
The gate
Everything below must be green before a change is done (run via siftlode check):
ruff (backend) · tsc ×3 + eslint + prettier + knip (frontend) · vitest · pytest. The
pytest lane runs in backend/docker-compose.test.yml — an ephemeral Postgres + the backend tree
bind-mounted — so the DB-backed integration tests (the db fixture) actually run; SIFTLODE_TEST_ REQUIRE_DB=1 there turns a would-be silent skip into a hard failure. See docs/development.md.