👀 Is it possible to set table names to lowercase with tap-postgres/target-postgres or stream maps. e.g. source has a table like this: Test_Table, I need it to be test_table on the target.

It's possible with streams maps but you'd need to enumerate all the streams you want to lowercase:

stream_maps:
  public-Test_Table:
    __alias__: public-test_table
  public-Another_Table:
    __alias__: public-another_table
  ...

Should this be set on tap or target?

The tap 🙂