Check-then-insert left a race: two concurrent requests for the same
slot could both confirm. Migration 00014 adds three partial btree_gist
exclusion constraints mirroring resourcesCollide semantics (same
staff, same location, both-unassigned), excluding cancelled rows and
class bookings. SQLSTATE 23P01 maps to ErrBookingConflict at all three
write paths so a lost race returns a clean 409.
Validated on a local Postgres 17 container: constraint matrix at SQL
level, repo-level 23P01 detection, concurrent burst yielding exactly
one confirmed booking.
Authored By: TDvorak <[email protected]>
Generated with [Devin](https://devin.ai)
Co-Authored-By: Devin <158243242+devin-ai-integration[bot]@users.noreply.github.com>
