peter
fe38dfbcca
The deep review of the branch raised 47 findings, 18 of which survived adversarial verification. Grouped by what they actually were: **The size ceiling inverted at its boundary.** `remaining_bytes` clamped to 0 for a user already at their storage cap, and `build_ydl_opts` reads 0 as "no limit" — so the one user over quota was the only one downloading with no ceiling at all. `check_enqueue` could not catch it: it ran while the job was queued and the user was still under the cap. The arithmetic moves into `quota.remaining_bytes` (where every other max_bytes decision lives, and where it can be tested), and the worker now fails the job outright rather than proceeding unbounded — as a non-retryable `quota_exceeded`, since retrying cannot help until space is freed. **Silent failures in the new account panel.** All three actions went through `quiet: true` endpoints, which suppress the global error dialog on the promise that the caller reports inline — with no `onError`, that promise was broken and a refusal rendered as nothing. On the broken-SMTP instance this panel exists for, an admin would read silence as "the mail went out". The co-invalidation set and the email-off predicate move to `lib/adminUsers`, shared with the pending-access queue, so the two copies of these mutations cannot drift apart again — which is how half of this was lost in the first place. **A rollback recipe that destroyed data without working.** `alembic downgrade -1` steps back one migration, but a release routinely ships several (0.80.0 shipped four): it drops the newest one's columns and leaves the schema at a revision the older image also cannot resolve, i.e. the crash loop it was meant to escape, minus the data. The dump restore is now the recommended path, and the alembic route asks the target version for its own head revision instead of counting backwards. Also: redirects named in the urlguard docstring beside the DNS-rebinding residual they share a fix with (SEC-17); a malformed port refused as `bad_port` instead of escaping as a 500; the pull cooldown extended to the sibling route spending the same QuotaAction; restore stops the app before dropping its tables; the PowerShell cleanup can no longer decide the script's verdict on 5.1, nor report the wrong exit code; the documented one-liners hardened to match the scripts; the registry's retention window stated where pinning is advertised; the two banners made mutually exclusive so neither can shadow the other; `hover:bg-hover` (a utility this project never generated) replaced by the `selectable` recipe; the clipboard helper reused; and the sync cooldown's copy swept to the two callers that discarded it. Verified: gate green (vitest 678, pytest 949), and the panel, the row hover and the reset banner UAT'd on localdev.
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.