# singer-tap-development


05/25/2021, 3:59 PM
I have another question, not as blocking but more trying to understand how this works, i've tried looking for docs on singer spec or meltano but didn't find much,; I see there are a couple of metadata columns added with targets such as target-snowflake from datamill, but this column stays empty with my tap:
(I see the logic to populate it comes from target-postgres) Is there a way to specify the table version somewhere in the singer sdk for taps, or is this something to specify in the target directly? Is this even worth pursuing or just some compatibility thing?