implement-crud

Row-Level Security (RLS) in Supabase enforces data access controls at the database level. Enable RLS on your table, define policies that match user ownership or roles, then implement Create, Read, Update, and Delete operations that respect those policies. This ensures users can only access their own records without additional application-layer checks.

Validate input data before sending requests—check required fields, data types, and constraints. Structure error responses consistently with status codes and messages. Handle duplicate-key errors, foreign-key violations, and RLS policy rejections. Log errors server-side for debugging while returning safe, user-friendly messages to clients.

Yes. Soft deletes mark records as deleted with a timestamp column while preserving data; filter queries to exclude soft-deleted rows. Hard deletes remove records permanently. Choose soft deletes for audit trails and recovery; use hard deletes for permanent removal. Implement both strategies conditionally based on your data retention requirements.

Use limit and offset parameters to paginate results; apply WHERE clauses or Supabase filters to narrow datasets by column values. Return pagination metadata—current page, total count, and remaining records—alongside results. This enables efficient browsing of large datasets and reduces payload size on mobile or bandwidth-constrained clients.

Type safety prevents runtime errors and improves code maintainability. Use TypeScript or your language's type system to define table schemas, request payloads, and response structures. Generate types from your Supabase schema or define them manually. Typed CRUD operations catch mismatches at development time rather than in production.

Ownership validation ensures users modify only their own records. Verify the user's ID matches the record's owner field before allowing updates or deletes. Combine this with RLS policies for defense-in-depth. Log unauthorized access attempts and return permission-denied errors to prevent data leakage or tampering.