Lately I wrote in python postfix policy service that can do something for
me what I want.
Now I am thinking about next service butI don't know maybe it is not
possible.

That is my question:

There is posssible write some service similar to eg.

check_policy_service unix:private/policy-spf

It is possible to write some policy service that will be working with
postfix queue ?

I would like have policy service that will be able to write do data base
some information eg. when exactly message was sent, message ID, DSN if
soemthing goes wrong.