UPDATE

farm_data/services.py

@@ -7,7 +7,6 @@ import uuid
 import warnings
 
 from django.conf import settings
-from django.apps import apps
 from django.db import transaction
 from django.utils.dateparse import parse_datetime
 from django.utils import timezone
@@ -217,16 +216,9 @@ def reconcile_legacy_farm_plants_relation(
     farm: SensorData,
     snapshots: list[PlantCatalogSnapshot] | None = None,
 ) -> None:
-    snapshots = list(snapshots if snapshots is not None else get_farm_plant_snapshots(farm))
-    Plant = apps.get_model("plant", "Plant")
-    if Plant is None:
-        return
-    names = [snapshot.name for snapshot in snapshots if snapshot and snapshot.name]
-    if not names:
-        farm.plants.clear()
-        return
-    legacy_plants = list(Plant.objects.filter(name__in=names).order_by("name", "id"))
-    farm.plants.set(legacy_plants)
+    # AI no longer mirrors canonical plant rows locally; the legacy relation is cleared
+    # so downstream services cannot accidentally read stale plant data.
+    farm.plants.clear()
 
 
 def get_canonical_farm_record(farm_uuid: str) -> SensorData | None:

farm_data/tests/test_farm_detail_api.py

@@ -86,8 +86,11 @@ class FarmDetailApiTests(TestCase):
         self.assertEqual([plant.name for plant in list_runtime_plants_for_farm(farm)], ["خیار", "گوجه‌فرنگی"])
         self.assertEqual(get_runtime_plant_for_farm(farm).name, "خیار")
 
-    def test_assignment_sync_reconciles_legacy_relation_for_transition(self):
-        self.assertEqual(list(self.farm.plants.values_list("name", flat=True)), ["خیار", "گوجه‌فرنگی"])
+    def test_assignment_sync_uses_backend_snapshots_as_canonical_source(self):
+        self.assertEqual(
+            list(self.farm.plant_assignments.values_list("plant__name", flat=True)),
+            ["خیار", "گوجه‌فرنگی"],
+        )
 
     def test_runtime_plant_lookup_resolves_by_name_from_canonical_assignments(self):
         farm = get_canonical_farm_record(str(self.farm_uuid))