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A first backfill enqueues artists before albums at a single priority, so the drain took them in that order. Artists resolve through a rate-limited agent, and gate() waits for its permit while holding a worker slot, so the whole pool sat asleep in the limiter with every album queued behind it. Measured on a 96k-track library (29,115 artists to 6,949 albums, 4:1): zero albums resolved in seven minutes, and roughly 3.3 hours before the first album cover would have appeared. Splitting the drain gives each class its own slots: albums now finish in under eight minutes while artists trickle at the same 2/s they were always limited to. The two budgets are carved out of MaxOpenConns so a second pool cannot take connections the scanner and the UI need. Dequeue filters by kind, and the drain index leads with item_kind so each pool seeks to its own work instead of scanning past the other's backlog.