Function cleanupExpiredEntries

web/src/app/api/v1/ads/impression/_post.ts:31–38

* Clean up expired entries from the rate limiter to prevent memory leaks. * Called periodically during rate limit checks.

()

 * Called periodically during rate limit checks.
 */
function cleanupExpiredEntries(): void {
  const now = Date.now()
  for (const [userId, limit] of impressionRateLimiter) {
    if (now >= limit.resetAt) {
      impressionRateLimiter.delete(userId)
    }
  }
}

// Track last cleanup time to avoid cleaning up on every request
let lastCleanupTime = 0