Check number of rows after table upload

[kadrlica]

It would be good to add an automated cross check that the number of rows upload is the same as the number of rows in the input file. I think that this could be done here-ish.

We have access to the input data (data) and we can query the newly created table. The primary downside of this is that querying the newly created table will be slow. Things will be more complicated when appending tables.