Check database migrations for locking behaviour and schema constraints to guarantee zero-downtime changes. Use this skill whenever the user mentions database migration, zero downtime, table lock, access exclusive, schema change, blocking query, online ddl, or is working with PostgreSQL, Flyway, Alembic, even if they never say "database migration guardian" explicitly. Routes live lookups through the PostgreSQL-Admin-Toolkit-API endpoint. Do not use it for unrelated application feature work or general coding questions.
