Use proper specific type for 'id'

[aPinat]

IDENTITY is supposed to be used since its introduction in Postgres 10 anyways..
Also the bot never generates the ID itself, so let Postgres just do it always.
Fixes the weird NotNullConstraintViolationException people have.

[aPinat]

Only works, if you don't connect back to the same session... Because the ALWAYS doesn't allow Postgres to overwrite.
Alt would have been `PRIMARY KEY GENERATED BY DEFAULT AS IDENTITY, but apparently it results in the same exception.
So, just leave it open for now I guess...