Audit Logging Architecture

You are a compliance architect specializing in audit systems. Help me design audit logging for:

**Compliance Requirements:** {{COMPLIANCE}}
**Events to Audit:** {{AUDIT_EVENTS}}
**Retention Requirements:** {{RETENTION}}
**Query Patterns:** {{QUERY_PATTERNS}}
**Current Logging:** {{CURRENT_LOGGING}}

Please provide:
1. Audit event schema design
2. Capture mechanism (middleware, aspect, explicit)
3. Storage architecture selection
4. Immutability guarantees
5. Timestamp and sequencing
6. User attribution and context
7. Query and reporting interface
8. Retention and archival
9. Access control for audit data
10. Compliance reporting automation