## Summary
The mollifier had ~21 behavioural constants baked in as hardcoded values
— the buffer's ack-grace TTL and Redis retry/reconnect tuning, the
drainer's poll interval and backoff envelope, the pre-gate idempotency
claim TTL/wait/poll, the buffered-run mutate-with-fallback wait loop,
the metadata CAS retry budget and backoff, the stale-sweep scan bounds,
and the draining-gauge interval. None could be adjusted without a code
change, which makes tuning the system under production load impossible.
This exposes all of them as `TRIGGER_MOLLIFIER_*` environment variables,
each defaulting to its previous hardcoded value. Behaviour is identical
unless an operator sets a var, so it's a safe no-op deploy.
## Design
The package-level classes (`MollifierBuffer`, `MollifierDrainer` in
`@trigger.dev/redis-worker`) gain optional constructor options
defaulting to the old constants — backward compatible, hence a patch
changeset. The webapp factories and worker bootstraps read the env and
pass them through. The route- and concern-level pure helpers
(mutate-with-fallback, metadata mutation, idempotency claim, stale-sweep
state) keep their existing `?? DEFAULT` option fallbacks and are fed env
values at their call sites, so they stay unit-testable without importing
`env.server`.
## Test plan
- [x] `@trigger.dev/redis-worker` builds
- [x] webapp typecheck passes
- [x] mollifier buffer + drainer testcontainer suites pass (modulo a
couple of pre-existing flaky timing tests)
- [x] Reviewer: confirm the `TRIGGER_MOLLIFIER_*` env var names match
ops conventions
---------
Co-authored-by: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Co-authored-by: coderabbitai[bot] <136622811+coderabbitai[bot]@users.noreply.github.com>
Daniel Sutton
4ea3ef138f