Start with the database guide for shared database policy. Read the detailed guidance matching the change; a router does not replace its selected reference.
| Task | Read |
|---|---|
| Schema changes or data migration | Migration workflows and DB migrations |
| Selections, raw results, or SQL rewrites | Query contracts |
| Transactions or concurrency changes | Transaction boundaries, concurrency, and transaction lint |
| External effects, recovery, or integration ordering | External effects and recovery |
| Persisted shapes or deploy order | Deployment compatibility |