db: raise env_builds.status statistics target

packages/db/migrations/20260727041000_env_builds_status_statistics.sql

@@ -0,0 +1,33 @@
+-- +goose Up
+-- +goose NO TRANSACTION
+
+-- ANALYZE cannot run inside a transaction; bound the pass so it neither
+-- hangs unbounded nor dies to a short session default.
+SET statement_timeout = '1h';
+
+-- Same treatment as status_group (20260725100500): status has a handful of
+-- values with heavily skewed frequencies, and the rare ones can drop out of
+-- the column's MCV list on an unlucky autoanalyze sample, leaving the
+-- planner to underestimate them by orders of magnitude on queries that
+-- filter by status. A larger per-column sample keeps every value visible
+-- across re-samples.
+ALTER TABLE public.env_builds ALTER COLUMN status SET STATISTICS 2000;
+
+-- Rebuild the column stats immediately rather than waiting for the next
+-- autoanalyze threshold.
+ANALYZE public.env_builds;
+
+-- The migrator session is reused for subsequent migrations: restore its
+-- baseline (scripts/migrator.go sets 3h per connection).
+SET statement_timeout = '3h';
+
+-- +goose Down
+-- +goose NO TRANSACTION
+
+SET statement_timeout = '1h';
+
+ALTER TABLE public.env_builds ALTER COLUMN status SET STATISTICS -1;
+
+ANALYZE public.env_builds;
+
+SET statement_timeout = '3h';