Michael, again thank you for feedback and answering.
Learning a lot and made Github space with my first module https://github.com/compie67/clippboard And also going so shere my work so far with the fediverse connection
regards
Eric

See the action of https://www.opensource-socialnetwork.org/component/view/7333 (1.0dev3)
on how to store extra member attributes

Michael, great feedback. i keep on working on this

There are several callbacks triggered on installing/enabling/etc... a component.
See https://www.opensource-socialnetwork.org/documentation/list/callback?offset=5

Code for creating new tables can be found in the installation directory.

Think twice if this is really necessary and cannot be accomplished by using OssnEntities/Metadata pairs instead like

    class YourFediConnector extends OssnEntities {
        public function dosomefediwork() {
        ....
        }
     }

and access that new class from your component (see blog component for example)

lol, no problem.
I just want to discover how module can write to the database.
Thats is where i got stuck now

I have 0% knowledge about Fediverse