M54: harden operations and demo resilience

backend/app/api/routers/data_quality.py

@@ -11,6 +11,7 @@ from app.models.booking import Booking
 from app.models.customer import Customer
 from app.models.data_quality import DataQualityIssue
 from app.models.inspection import Inspection
+from app.models.maintenance import MaintenanceRecord
 from app.models.user import User
 from app.models.vehicle import Vehicle
 from app.schemas import (
@@ -224,6 +225,8 @@ _PREFIX_TO_TYPE = {
     "MO-": "vehicle",
     "BK-": "booking",
     "INSP-": "inspection",
+    "MAINT-": "maintenance",
+    "MNT-": "maintenance",
 }
 
 
@@ -292,6 +295,17 @@ def _snapshot(entity_type: str, ref: str, db: Session) -> dict | None:
             "completed_at": inspection.completed_at.isoformat(),
             "booking_ref": booking.public_ref if booking else None,
         }
+    if entity_type == "maintenance":
+        record = db.scalar(select(MaintenanceRecord).where(MaintenanceRecord.public_ref == ref))
+        if record is None:
+            return None
+        return {
+            "entity_type": "maintenance",
+            "public_ref": record.public_ref,
+            "odometer_km": record.odometer_km,
+            "occurred_at": record.occurred_at.isoformat(),
+            "category": record.category,
+        }
     return None