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Emi Matchu 470c805880 Save last trade activity time onto User
In impress-2020, we do a big slow query to figure out which users have
been active in trades recently. Now, we cache that timestamp on the
User model.

This won't have any immediate effect; it's to clear the way for Classic
DTI to receive the better trade ratios feature people like from 2020.

I also added some unit testing infra because I finally wanted it! for
all the ways you can trigger this timestamp lol

Note too that this is a bit of an unusually complex migration, but my
hope is that the batching and query structure and such helps it run
surprisingly fast! 🤞
2024-01-19 00:00:46 -08:00

2.9 MiB