Problematic mapping from PostgresSQL's bigint to number in JS

[sonallux]

PostgresSQL's bigint data type is currently used for all ids in all databases. Those ids are nearly everywhere mapped to number in TS/JS, which is problematic because bigint is a 64-bit integer value whereas number is only a 53-bit integer value.

As discussed with @georg-schwarz and @mathiaszinnen it is desired that the type of those numeric ids should be changed to strings, to solve this issue. Users should then also able to chose their own speaking names for the ids, so they can more easily remember and work with them.