data leak detection

Can you add a pseudo data insertion function for users? For example: when user Bob connects via maxscale, he sees a pseudo-row in a specific table. User Alice sees other pseudo-rows in another table. In case of theft, I would understand who committed the leak according to mixed data.

I would like to have some dictionary in which some pseudo-data or regular expressions will correspond to users.

https://mariadb.com/resources/blog/mariadb-maxscale-masking-and-firewall/