## Problem
App/logic-function crons occasionally fire **twice, ~1 minute apart**.
The most visible symptom is a notification cron sending the same Discord
DM (or channel post) at e.g. `17:00` and again at `17:01`.
## Root cause
`CronTriggerCronJob` runs every minute (`* * * * *`) and re-dispatches
any logic function whose pattern is "due" according to `shouldRunNow`:
```ts
const diff = Math.abs(prevTriggerDate.getTime() - now.getTime());
return diff < rootCronIntervalMs; // 60_000
```
The detection window (`60_000ms`) is **equal to** the 60s tick interval.
So when a root tick drifts across a minute boundary (runs slightly
early/late, or BullMQ fires a catch-up), two adjacent ticks can both see
the *same* trigger as "within the last 60s" and each enqueue a
`LogicFunctionTriggerJob`. The dispatch isn't idempotent, so the
function runs twice.
## Fix
Make dispatch idempotent, keyed on the trigger itself:
- New `getMatchingTriggerTimestamp(pattern, now)` returns the epoch-ms
of the matched trigger (stable regardless of *when* within the window
the root job runs), or `null`. `shouldRunNow` now delegates to it —
behaviour unchanged.
- Before enqueuing, `CronTriggerCronJob` claims a
`logic-function-cron:{workspace}:{function}:{triggerTs}` key in the
`EngineLock` cache. A second tick that resolves to the same trigger
finds the key and skips.
Distinct triggers always have distinct timestamps (hence distinct keys),
so a later legitimate run is never suppressed. The TTL (2 min) only
needs to outlive the detection window.
## Notes
- `WorkflowCronTriggerCronJob` uses the same `shouldRunNow` pattern and
has the same latent double-dispatch; left out of this PR to keep it
focused, but the new helper makes the same guard a small follow-up.
- The cache `get`-then-`set` isn't atomic; for the observed failure mode
(ticks ~1 min apart, sequential) it's reliable. A Redis `SET NX` would
also close the rare concurrent-multi-instance race.
## Test plan
- [x] `should-run-now.utils.spec.ts` extended: two ticks within one
window resolve to the same timestamp; out-of-window and invalid patterns
return `null`. All 8 pass.
- [x] `oxlint --type-aware` + `oxfmt` clean on changed files.
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Charles Bochet
ad61d6d8a3
