A queued start or restart whose reservation expired no longer runs. Failed
queued starts are recorded as failed activities and release the reservation.
Two parallel start requests both passed the in-progress check and got
200, because the start activity is created later by the queued action.
A per-database reservation (Cache::add, 600 s) is now taken before the
check, so the second request gets 409. The action releases it when it
creates its activity, skips, or fails. Restart, import, the deploy
API, MCP, and Livewire use the same reservation.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Andras Bacsai
