peter
bc9e34d0ae
DX-17, three one-liners the epic's canonical sweep did not reach:
`routes/setup.py::setup_admin` still resolved the wizard's admin by
literal `User.email ==`. The wizard can be re-run, and E9.5's premise is
that two spellings of one Gmail mailbox are one person — so a second run
under the other spelling would have created exactly the duplicate admin
row the epic exists to prevent.
`routes/admin.py::_decide` hand-rolled `db.get` + 404 where the file's
newer endpoints use `get_or_404`. There were TWO such sites, not the one
the review named; both are converted, per the house rule that a
principle gets fixed everywhere in one sweep.
`useVerifyEntry`'s `hashchange` listener recognised `#verify=` but not
`#reset=`, so pasting a reset link into a tab already running the app
was silently ignored — the same silence that made the verify half a bug.
It now notices, and says out loud that reset links need a signed-out
window; the fragment is still deliberately left in the address bar
(review round 4), so signing out from that tab recovers it.
DX-16: `.catch(() => setOutcome("invalid"))` could not tell a spent
token from a 502 mid-deploy or a dropped connection, and by then the
fragment is cleared — so a network blip was reported as "that link is no
longer valid", pushing the user to request a fresh one on the strength
of a false statement. Only a 400 carrying {code:"verify"} is the
server's verdict now; everything else gets its own outcome, with no
resend CTA, because the token is untouched and retrying it works. The
rule was already written one file away for the reset-link probe: "a
network blip must never be cached as 'this link is dead'".
Two existing tests asserted the old conflation by rejecting with a bare
Error("400"); they now reject with the real HttpError. The errors are
built inside the rejection, not hoisted: mountAt calls vi.resetModules(),
so an HttpError imported earlier is a different class identity and
`instanceof` would quietly miss.
Gate: vitest 671 -> 676, pytest 924 -> 925.
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.