[realcodesiman]

Summary

• Bound scheduled workspace teardown work so large purges yield before the cron deadline instead of holding the purge lease indefinitely.
• Preserve the reversible deletion grace period; runtime work is frozen only when deletion becomes due.

Changes

• Add timeout-guarded, resumable batches for workspace lifecycle cleanup, sequence dispatches, analytics, partitioned rows, and quota reconciliation.
• Add FK indexes, concurrent partitioned-index migrations, schema metadata, and purge-index coverage.
• Document workspace-purge invariants for database, worker, and agent workflows.

Test plan

• pnpm ultracite fix (commit hook; no fixes needed)
• pnpm lint
• pnpm --filter @chatbotx.io/database check-types
• pnpm --filter @chatbotx.io/database test
• Manual verification of a due workspace purge alongside activity in another workspace