1. Identify the source of the PostgreSQL 42712 error:

SELECT * FROM pg_stat_activity WHERE state = '42712'

2. Check the PostgreSQL log file for more information about the error:

tail -f /var/log/postgresql/postgresql.log

3. Check the PostgreSQL configuration file for any misconfigurations:

cat /etc/postgresql//main/postgresql.conf

4. Check the PostgreSQL database for any invalid objects:

SELECT * FROM pg_catalog.pg_class WHERE relkind = 'i'

5. Check the PostgreSQL database for any invalid permissions:

SELECT * FROM pg_catalog.pg_roles

6. Check the PostgreSQL database for any invalid user-defined functions:

SELECT * FROM pg_catalog.pg_proc WHERE proname = ''

7. Use an automated database observability tool to monitor and fix the PostgreSQL 42712 error. Automated database observability tools can provide real-time visibility into the performance and health of your PostgreSQL database, allowing you to quickly identify and fix any issues that may arise. Additionally, these tools can provide detailed insights into the root cause of the error, allowing you to take proactive steps to prevent similar issues from occurring in the future.