The Postgres functions used for logging transactions can only track server-side actions and parameters, not client-side ones. E.g. if multiple users work against the database by using one database role would be referenced to this role. Sure, there is the `client_name` field (IP) in `transaction_log`, but if all users are using the same remote client you cannot make distictions on the client IP. In order to log information specific to each database interaction pgMemento provides a JSONB field in the `transaction_log` table. Everything a client connection needs to do is to set a local
configuration parameter, named `pgmemento.session_info`:

```sql
SELECT
  set_config(
    'pgmemento.session_info',
    '{"client_user":"fxku", "message":"Added new category to table"}'::text,
    FALSE
  );
```

_**Note:**_ The value of `session_info` should be valid JSON to later query the `session_info` column with JSONB operators. Otherwise, the text is converted with `to_jsonb` which might not produce valid JSON.

The configuration parameter lives as long as the session lasts. If you want it to last only during a single transaction change the last argument to TRUE.