Function fix 

pub(super) async fn fix(services: &Services) -> Result

Runs the one-time chain cache clear, then the injectivity scan, heal, and repair behind MARKER.

The clear takes CLEAR_MARKER and runs ahead of the early return, so a database that already completed the repair still discards its chains. The stamp follows any verdict: a settled repair stamps the empty value, a decline stamps its counters, and only an error leaves the marker unwritten and fails the boot. A heal rescans rather than repairing, because it changes the losers and winners the repair consumes.