The Python suite has no coverage for how schema operations interact with concurrent transactions, or for the lifecycle of tables that are created and dropped without ever reaching a checkpoint. Both areas have observable correctness properties that warrant explicit regression tests.

Add a new test file (or extend an appropriate existing one) to cover:

Transaction interaction:

• Keep a schema-related transaction open while performing unrelated writes; verify unrelated writes still succeed.
• Keep pending schema metadata unpublished while taking a checkpoint; verify checkpoint still succeeds.
• Leave schema metadata pending in a transaction and inspect durable metadata after checkpoint; verify pending metadata does not leak into durable metadata.

Lifecycle:

• Create, drop, and reap a table without taking a checkpoint; verify the transient sequence does not become durable.
• Create, drop, and reap a table without checkpoint, then reopen or restart; verify the table is not resurrected.