I don't think the parent's talking about doing all operations via the fdw, but rather using the foreign data wrapper to fill the table. So instead of pulling al

I don't think the parent's talking about doing all operations via the fdw, but rather using the foreign data wrapper to fill the table. So instead of pulling all the data into a python script and then pumping it out into the postgresql database, you're using postgresql itself to do the fill operation. Additionally, by using the foreign data wrapper, you could also create a materialized view based on the results, if you still want most activities using the mongodb instances for whatever reason.