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Flyway: two instances calling migrate() at the same moment
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captured: 2026-09-15T07:07:28.249758300Z

instance A migrate() took 932ms
instance B migrate() took 910ms
wall-clock time for both, run concurrently: 937ms

-- flyway_schema_history after both finished --
installed_rank | version | description                               | success
---------------+---------+-------------------------------------------+--------
-1             | NULL    | << Flyway Schema History table created >> | true   
1              | 1       | SlowMigration                             | true   
(2 rows)
