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This PR is the first in a series aimed at closing [#15109](https://github.com/coder/coder/issues/15109). ### Changes - **Template Database Creation:** `dbtestutil.Open` now has the ability to create a template database if none is provided via `DB_FROM`. The template database’s name is derived from a hash of the migration files, ensuring that it can be reused across tests and is automatically updated whenever migrations change. - **Optimized Database Handling:** Previously, `dbtestutil.Open` would spin up a new container for each test when `DB_FROM` was unset. Now, it first checks for an active PostgreSQL instance on `localhost:5432`. If none is found, it creates a single container that remains available for subsequent tests, eliminating repeated container startups. These changes address the long individual test times (10+ seconds) reported by some users, likely due to the time Docker took to start and complete migrations.