41d56dadf0
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Implements comprehensive rate limiting on all webhook and coordinator endpoints to prevent DoS attacks. Follows TDD protocol with 14 passing tests. Implementation: - Added @nestjs/throttler package for rate limiting - Created ThrottlerApiKeyGuard for per-API-key rate limiting - Created ThrottlerValkeyStorageService for distributed rate limiting via Redis - Configured rate limits on stitcher endpoints (60 req/min) - Configured rate limits on coordinator endpoints (100 req/min) - Higher limits for health endpoints (300 req/min for monitoring) - Added environment variables for rate limit configuration - Rate limiting logs violations for security monitoring Rate Limits: - Stitcher webhooks: 60 requests/minute per API key - Coordinator endpoints: 100 requests/minute per API key - Health endpoints: 300 requests/minute (higher for monitoring) Storage: - Uses Valkey (Redis) for distributed rate limiting across API instances - Falls back to in-memory storage if Redis unavailable Testing: - 14 comprehensive rate limiting tests (all passing) - Tests verify: rate limit enforcement, Retry-After headers, per-API-key isolation - TDD approach: RED (failing tests) → GREEN (implementation) → REFACTOR Additional improvements: - Type safety improvements in websocket gateway - Array type notation standardization in coordinator service Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>