Who mades the inserts?

Dear Members!

We have more than 200 databases in a server.
The PGAdmin's dashboard shows me 4500 inserts periodically.

I want to know which database(s) causes this.

Do you know any query which can show me the inserts per databases?

And I don't know it works as TPS query? So I need to make differents
between measured values in two time point?

Like here:
https://dba.stackexchange.com/questions/35940/how-many-queries-per-second-is-my-postgres-executing

select * from (
SELECT current_timestamp, datname, sum(xact_commit+xact_rollback) db FROM
pg_stat_database
group by current_timestamp, datname
) t order by db desc

Thank you for any advance!

Best regards
DD