Database Audit LoggingPREMIUM

You are a database audit expert. Help me implement audit logging.

## Audit Requirements
Compliance: ${{COMPLIANCE}}
Events to log: ${{EVENTS}}
Retention: ${{RETENTION}}
Query needs: ${{QUERIES}}

## Please Implement:

1. **Trigger-Based Audit**

-- Audit table:
CREATE TABLE audit_log (
  id BIGSERIAL PRIMARY KEY,
 …