@MatthewMac @dr_michaelmarks @Florian_May
okay i looked into the timeout issue. turns out the server was doing the right thing and i neglected to configure nginx to match. silly and simple problem. silly and simple fix:
you can find the diff here if you want to quickly patch your setup.
(the increase to a 2 minute timeout is probably not strictly necessary. it's a per-chunk timeout, so it will only trip if no new data is streamed back to the client within that window. i artificially inflated row-processing time by 50ms per row and the first chunk came back at 58 seconds so i figured 2 minutes wasn't a terrible idea for some diabolically complex forms, possibly. i don't see the harm in increasing by 60 seconds.)