Code Review Task: HTTP GET /events Handler

Context

Assume a typical REST endpoint GET /events that lists events for a consumer application. The handler supports query parameters like:

• q (text search), from/to (date range), venueId, performerId, category, sort, page, pageSize, include (e.g., venue, performers, tickets)
• It fetches data from a relational DB via an ORM, may optionally call one or two downstream services (e.g., pricing, recommendations), and returns JSON.

You are given a code snippet that implements this handler (getEvents). Your goal is to perform a thorough code review and propose concrete improvements.

Tasks

1. Performance
   • Identify issues such as N+1 queries, missing pagination/limits, inefficient sorting/filtering, missing indexes, excessive serialization, uncompressed/unpaginated payloads, and missing caching or ETags.
   • Propose specific fixes.
2. Scalability
   • Evaluate statelessness, concurrency handling, connection pooling, batching, backpressure, timeouts/retries with jitter, circuit breakers, rate limiting, and dependency fan-out.
   • Propose specific fixes.
3. Security
   • Verify authentication and fine-grained authorization, input validation and injection prevention, output encoding, sensitive data exposure (PII), TLS requirements, CSRF/IDOR risks, logging redaction, and resource quotas to prevent abuse.
   • Propose specific fixes.

Additionally, define monitoring/alerting metrics and SLOs, and outline targeted tests (unit, integration, load, and security) to validate your recommendations. Explain trade-offs for each change.