feat: implement cache layer, CSP improvements, and database performance optimizations

- Add Redis cache implementation with LRU eviction
- Enhance Content Security Policy with nonce generation
- Optimize database queries with connection pooling
- Add cache invalidation API endpoints
- Improve security monitoring performance

lib/auditLogRetention.ts

@@ -119,11 +119,11 @@ export class AuditLogRetentionManager {
     };
 
     if (policy.severityFilter && policy.severityFilter.length > 0) {
-      whereClause.severity = { in: policy.severityFilter };
+      whereClause.severity = { in: policy.severityFilter as any };
     }
 
     if (policy.eventTypeFilter && policy.eventTypeFilter.length > 0) {
-      whereClause.eventType = { in: policy.eventTypeFilter };
+      whereClause.eventType = { in: policy.eventTypeFilter as any };
     }
 
     return whereClause;