worker/jobs/downloads/update_metadata: Update values in the crate_downloads table too

This is not removing the `crates` table update just yet, since we need to keep both tables in sync for now until the rest of the code is migrated to reading from the `crate_downloads` table instead.

Author: Turbo87

src/worker/jobs/downloads/update_metadata.rs

@@ -126,6 +126,12 @@ fn batch_update(batch_size: i64, conn: &mut PgConnection) -> QueryResult<i64> {
                 SET downloads = crates.downloads + crate_downloads_batch.downloads
                 FROM crate_downloads_batch
                 WHERE crates.id = crate_downloads_batch.crate_id
+            ), updated_crate_downloads AS (
+                -- Update the `downloads` count for each crate in the `crate_downloads` table.
+                UPDATE crate_downloads
+                SET downloads = crate_downloads.downloads + crate_downloads_batch.downloads
+                FROM crate_downloads_batch
+                WHERE crate_downloads.crate_id = crate_downloads_batch.crate_id
             ), updated_metadata AS (
                 -- Update the `total_downloads` count in the `metadata` table.
                 UPDATE metadata