What does the error message "django.db.utils.OperationalError: ERROR: no more connections allowed (max_client_conn)" mean?

edit

This error message means that the database server has reached its maximum limit for concurrent connections from clients. Therefore, no more connections can be established until some of the existing connections are closed. The solution to this error depends on the specific application and its usage patterns. Some possible actions to take include optimizing database queries, increasing the database connection pool size, or upgrading the hardware of the database server.