controllers/krate/search: Read downloads from crate_downloads
table
#8244
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This PR builds on top of #8232 and switches our
GET /api/v1/crates
endpoint over to using thecrate_downloads
table instead of thecrates.downloads
column.Performance tests on the production replica database indicated that this should not significantly affect the performance of the endpoint (see https://rust-lang.zulipchat.com/#narrow/stream/318791-t-crates-io/topic/.60crate_downloads.60.20table).
This should allow us to eventually remove the
crates.downloads
column, reducing the number of writes to thecrates
table.