make qualtrics survey instance id nullable on result objects #29
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Another short PR -- the survey extract was hard-crashing when invalid instance_ids were provided. This combined with a partner PR in platform should fix it. (no change to SQL should be needed. This field is nullable in the database.
I chose this approach over switching everything to a string (the raw data returned from the API) because we currently have a foreign key relationship. I think it's theoretically still possible for a third party to crash this process by inputting a random UUID through manual URL editing, but it's much less likely and would require a seperate fix.