Two related production-readiness checks for the schema epochs feature.

Production feature control

Verify that the schema epochs server parameter is startup-configurable and can be safely enabled or disabled in production. The server parameter is already present in production; confirm the toggle behaves correctly across enable/disable cycles with no data loss or invariant violations.

Persisted epoch information

Assess whether epoch state is persisted on disk (for example in metadata or checkpoint records) and whether that representation is compatible with safe feature toggling — enabling, disabling, and re-enabling without corruption or assertion failures. Not PuP-blocking.