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Jinwoo Hong
ddbad2218b
Added in #21301 on the reasoning that the composite (active, deadline) index spans all 6.65M rows to find a few hundred live ones. Measured post-merge against production-shaped history, that reasoning does not hold: a basis is inserted active and flipped to 0, so the partial index accumulates one dead entry per deactivation exactly as the composite one does. Scan buffers are identical to composite-only in every state, 11,099 cold, 2,522 warm, 9 after VACUUM, and the planner picks the composite index throughout. The extra index costs ~65 bytes of WAL per basis insert, about 22% more. The relief is the reaper plus vacuum, which #21301 already ships. Removes the statement from SCHEMA, restores the plan test to pinning the composite index by name, and records why a narrower index is not the cure so the next reader does not re-derive it.