1. Identify the source of the PostgreSQL 42846 error:

SELECT * FROM pg_stat_activity WHERE state = 'idle in transaction';

2. Check the application code for any open transactions that are not being committed or rolled back:

SELECT * FROM pg_stat_activity WHERE state = 'active';

3. If any open transactions are found, roll them back:

ROLLBACK;

4. Check the application code for any queries that are taking too long to execute:

SELECT * FROM pg_stat_activity WHERE state = 'active';

5. If any queries are found that are taking too long to execute, optimize them:

EXPLAIN ANALYZE SELECT * FROM table_name;

6. Monitor the PostgreSQL server for any further occurrences of the PostgreSQL 42846 error:

SELECT * FROM pg_stat_activity WHERE state = 'idle in transaction';

7. Use an automated database observability tool to monitor and fix the PostgreSQL 42846 in question. Automated database observability tools can provide real-time insights into the performance of your database, allowing you to quickly identify and address any issues that may arise. They can also provide detailed metrics and logs that can help you identify the root cause of any issues, as well as provide recommendations for optimizing your database performance.