Avoiding PostgreSQL Pitfalls: The Hidden Cost of Failing Inserts

A seemingly innocuous device ping tracking system became a major performance bottleneck as traffic increased. The culprit was a simple INSERT query that frequently conflicted with existing records, causing transaction rollbacks and table bloat. This led to significant database slowdowns and API timeouts. By implementing PostgreSQL's ON CONFLICT DO NOTHING clause, either through Django's bulk_create or raw SQL, the issue was resolved. Query time dropped dramatically, autovacuum activity ceased, and API timeouts disappeared, restoring system performance.