## Summary
Deleting a project triggered an unbounded database cleanup that scanned
the project's entire run history, so deleting a project with many runs
could be very slow. Project deletion is a soft delete again: run data is
retained and the deletion completes quickly.
## Fix
Project deletion ran a cascade hard-delete whose `BulkActionItem` step
filtered through a relation to `TaskRun` scoped by `projectId`. Prisma
compiles that to an `EXISTS`-join over the project's entire `TaskRun`
set (a large, hot table with no `projectId` index), and it ran on every
project deletion unconditionally.
Removing the cascade-cleanup call restores the prior soft-delete
behaviour: queues are removed, the project is marked deleted, and run
data is retained. The cascade-cleanup service (added in
[#4117](https://github.com/triggerdotdev/trigger.dev/pull/4117)) had no
other callers, so it and its test are deleted.
Daniel Sutton
80d4819a03