Function maintain_appointments 

pub fn maintain_appointments(
    adapter: &dyn DatabaseOperations,
    config: &DbBackendConfig,
    schema: &AppSchema,
    actor_id: i64,
    dedupe: bool,
    reassign: bool,
    reconcile: bool,
) -> Result<Vec<String>, DatabaseError>

Applies selected repairs to a bounded appointment set in one guarded transaction. No JSON state file or backend-specific query participates.