peter
fc56f514b3
Round three, on round two's diff. The trend across the loop is 47 -> 34 -> 15 raw findings; the ops half kept producing the sharpest ones because the gate cannot run it. **`docker compose start` ignores a newly pinned IMAGE_TAG.** Round two removed the automatic restart because it re-ran `alembic upgrade head` — and then told the operator to run that exact command by hand, in both scripts and the docs. `start` relaunches the container that already exists, which still carries the tag being rolled back FROM, so pinning 0.79.0 and following the printed instruction brings 0.80.0 back up and re-applies its migrations. Verified against a real daemon: after changing the pinned tag, `start` kept the old image and only `up -d` picked up the new one. Both scripts and the doc now say `up -d`, with the pin-first caveat where the operator reads it. **The reset flag outlived its token.** Reverting round one's "each link clears the other" went one step too far: a `#verify=` link pasted over a standing reset notice replaces the whole fragment, so the reset token is gone — but `resetPending` stayed true, and being checked first it hid the confirmation while promising a recovery that signing out could no longer complete. The flag is now cleared when the fragment it describes is gone, which is narrower than what was reverted and does not blank the signed-out card. **A test that could not fail.** The shared-asset regression test seeded the asset as `pending`, and `_reset_asset_pending` only acts on `downloading` — so the release half was a no-op and deleting it kept the suite green. Seeded as the worker actually leaves it now. Also: the malformed-URL guard answers with urlguard's structured detail rather than a bare English string, so both halves of one typo class get the same localized copy, and the third site in that module handing user input to `urlparse` was swept with it; the asset is released after the job is terminal, not before; the Stats 403 toast gets the wizard handle its own comment claimed it had; the pasted Windows recipe sets `$ErrorActionPreference` inside the block (a scriptblock inherits the caller's, so a `SilentlyContinue` profile swallowed every throw) and cleans up the container-side dump on the failure path too; the restore warning moved to the warning stream so a `> log` redirect cannot file it away; and two comments narrowed to what the code does. Gate green: vitest 685, pytest 950.
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.