# Work Summary — 2026-08-05 21:01

## Task
Insight #3 from the `domains/amazon` design review: the 1-minute poll fallback in `ProcessEvents` was a bare `time.Minute` literal inline in a `select` - untestable without waiting 60+ seconds or refactoring, not tunable without a code change, and with no logging distinguishing whether a wake-up came from a real NOTIFY or the poll timer.

## Design confirmed with user before implementing
- Deploy-time configurable, not live/API-adjustable - matches how `notifyRetryAfter` (insight #2) already works: a field set once at `Mocks` construction, changed by editing the call site and restarting, not a runtime toggle. No stated need for a live knob, and adding one (mutex-guarded field, endpoint, auth, validation) would be real complexity for a need nobody has.
- Go-level field + builder only, not wired through `.env`/`config.Config` - consistent with `notifyRetryAfter`, which also isn't env-configurable today.

## Changes
`domains/amazon/mock.go`:
- `Mocks` gained a `pollInterval time.Duration` field (default `time.Minute`, via new `defaultPollInterval` const) and `WithPollInterval(d)` builder, mirroring `WithNotifyRetryAfter`.
- `ProcessEvents`'s `select` now uses `m.pollInterval` instead of the `time.Minute` literal.
- Added a `Debug` log line on each of the two meaningful wake-up branches ("woke up: notification received" / "woke up: poll interval elapsed"), so it's now observable in practice which path is actually firing - previously both looked identical afterward.

`domains/amazon/mock_test.go`:
- New `TestProcessEvents_PollFallbackPicksUpRetryDueEvents`. Proving the poll branch actually works without waiting 60s - or without any trigger/NOTIFY manipulation that would be unsafe to run against the shared dev DB - needed a bit of care: a direct insert into `mock.shop_amazon_events` isn't possible (FK to `mock.raw_shop_events`), and any insert into `raw_shop_events` for `platform='amazon'` unconditionally fires the trigger's `pg_notify`, so there's no clean way to insert an event that's guaranteed to never notify. Instead, the test reuses insight #2's retry mechanism: one real event is inserted (fires NOTIFY normally, dispatched once), the listener never acks it, and with `notifyRetryAfter` set smaller than `pollInterval`, the event becomes retry-due almost immediately - so the *only* thing that can cause a second dispatch, since nothing else ever notifies again for the rest of the test, is the poll timer in the `select` firing on its own. Confirms the mechanism cleanly and safely (no shared state touched beyond the test's own rows).

## Verification
- `go build ./...` / `go vet ./...` clean.
- Manually confirmed the new log lines actually fire as expected: a small standalone program (not part of the repo, written to the scratchpad and deleted after) run against the test DB with `WithPollInterval(60ms)` printed `"woke up: poll interval elapsed"` on a steady ~60ms cadence.
- `go test ./domains/amazon/... -v -race`: all 6 tests pass (5 existing + 1 new).
- 10x repeated runs (`-count=1 -race`) with no flakes, ~1.4-1.5s each.
- `make test` / `make test-against-dev-db`: full suite green both ways; zero leftover rows in the dev DB afterward.

## Follow-ups / not done here
- Insight #4 (a LISTEN-connection error is fatal to the *entire application*, not just this processor - the most consequential one, given eleven more platforms already share this trigger shape in the migrations) remains open, next in line per the user's one-at-a-time request.