pub const TEMPLATE_PROMOTE_MARKER_V1: &str = "migration_template_promote_v1.flag";Expand description
Marker file name for the Phase 1 two-tier-picker migration.
Vestigial. Originally gated migrate_promote_template_sessions_v1
as a one-shot. The 2026-05-24 self-idempotency rework moved gating
to the data invariant (“no seeded def has a session zone”), so the
migration runs on every startup and is a no-op when the invariant
already holds. The constant + data_dir parameter on the migration
function are kept for API/import compatibility and so the legacy
marker file (if present from an earlier portable run) isn’t
resurrected. Operators may delete the file; the migration ignores
it either way.