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fix(db): serialize concurrent migrations - #81
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Concurrent startup can apply and record the same migration more than once. Serialize migrations with a PostgreSQL advisory lock on one dedicated connection.
Close that session after success or failure. Add tests for eight simultaneous calls on an empty schema and recovery after a failed migration.
Run the race tests with
DATABASE_URLset to a fresh, empty PostgreSQL database.Tested:
go test -race ./... go vet ./...