1. Identify the source of the PostgreSQL 22000 error. This can be done by running the following command in the PostgreSQL shell:

SELECT * FROM pg_stat_activity;

2. Once the source of the error is identified, the next step is to determine the cause of the error. This can be done by running the following command in the PostgreSQL shell:

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

3. Once the cause of the error is identified, the next step is to fix the issue. This can be done by running the following command in the PostgreSQL shell:

ROLLBACK;

4. After the issue is fixed, the next step is to verify that the issue has been resolved. This can be done by running the following command in the PostgreSQL shell:

SELECT * FROM pg_stat_activity;

5. As a final step, it is recommended to use an automated database observability tool to monitor and fix the PostgreSQL 22000 in question. This tool can be used to detect any potential issues with the database and alert the user when an issue arises. It can also be used to track the performance of the database and identify any areas of improvement. This can help to ensure that the database is running optimally and any potential issues are addressed quickly.