Add database-level check constraints to ensure scheduled task intervals are always
positive for both Postgres and SQLite. Update admin API and UI to support sub-minute
intervals and stricter validation. Refactor scheduled task update logic to upsert
rows, ensuring tasks can be updated even if not yet present in the database.
Improve temporary upload cleanup to delete in paginated batches. Enhance tests to
cover new constraints and update behaviors.
Add a general-purpose scheduled task system with a persistent registry and status tracking, supporting background maintenance jobs such as orphaned blob reaping, expired upload cleanup, job event pruning, and TTS usage retention. Implement a new `scheduled_tasks` table, task engine, and handlers for each maintenance operation. Integrate an admin UI panel for monitoring, manual runs, and configuration of tasks. Update document and user data cleanup flows to delegate shared blob and preview deletion to the scheduled reaper. Add Vercel cron integration for serverless environments.
BREAKING CHANGE: Document and user storage cleanup now relies on background scheduled tasks for shared blob and preview deletion; immediate inline deletion is no longer performed.
