I solved the problem already. but now a question:

how can I write None (not a string) to a table?!?

when I read the os created table, there is such value and I am unable to write such to the table.

and I am a bit unsure if outside writes are possible: at least my otherwise except the None similar string write to db gets erased

e: damn it appears you should not touch the db manually. found an api for it though but it seems pretty complicated.