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Jinwoo Hong
b6f453df06
The sticky refresh path and reservation reconciliation both took the fleet-wide `relay_cells ... FOR UPDATE` scan to mutate one or two rows, so one busy cell queued unrelated reconnects and migration completions behind it. Both now lock only the rows they touch, in the same ascending cell_id order, and the sticky grant moves its counter by a delta instead of writing back a snapshot value. Placement keeps the ordered inventory lock: choosing the least-loaded cell is a genuinely fleet-wide decision, and dynamically locking only the selected target is what allowed cross-cell cycles before. The pool's statement_timeout becomes env-configurable and a 57014 now reaches the bounded transaction retry instead of surfacing as a terminal failure. Schema DDL moves to its own `max: 1`, statement_timeout-free pool that is ended before the serving pool opens, so a slow CREATE INDEX cannot inherit a request deadline it will never fit inside.