Use database lock to prevent migrations from running concurrently #204
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Use Postgres advisory lock when migrating an event store database to ensure only a single migration can run at a time. This protects against running migrations concurrently by mistake. Fixes #192.
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Use Postgres advisory lock when migrating an event store database to ensure only a single migration can run at a time. This protects against running migrations concurrently by mistake.
A database lock is used to ensure only one migration can run at a time, preventing issues with multi-node deployments where the migration is automatically run on startup where two or more nodes starting at the same time may attempt to migrate simultaneously.
Fixes #192.