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Changes
Turns out the actual issue was that we were still doing a sequential scan on posthog_person to check if the input matched an ID. I think it's okay for now to just expect distinct ids, can add emails back in later.
Before, didn't finish within 30 seconds with 1000 distinct ids
After:
![image](https://user-images.githubusercontent.com/1727427/106124463-676c4880-615b-11eb-9c25-a4e9bdb3fd81.png)
Checklist