django.db.utils.OperationalError: FATAL: too many connections

PostgreSQL connection pool exhausted. 1. Use pgbouncer in transaction pooling mode. 2. Set `CONN_MAX_AGE` in DATABASES settings to reuse connections (default 0 = new per request). 3. Reduce workers/threads on your WSGI server if you have many of them. 4. Raise `max_connections` in postgresql.conf only as last resort — each connection = ~10MB RAM.