backend: test camera e modo di analisi nel task, /vision/check (Refs #97)

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

src/backend/tests/test_migrations.py

@@ -341,3 +341,22 @@ class TestStationCameraMigration:
         assert "vision_worker_url" in cols("stations")  # la 019 resta
         command.upgrade(cfg, "head")  # e di nuovo su
         assert {"camera_url", "camera_source"} <= cols("stations")
+
+
+class TestTaskAcquisitionMigration:
+    """021_task_acquisition: recipe_tasks.acquisition_json, su e giu (#97)."""
+
+    def test_021_upgrade_and_downgrade(self, sqlite_database_url):
+        db_path, _ = sqlite_database_url
+        cfg = _alembic_config()
+
+        def cols(table):
+            return {c["name"] for c in _inspect(db_path).get_columns(table)}
+
+        command.upgrade(cfg, "head")
+        assert "acquisition_json" in cols("recipe_tasks")
+        command.downgrade(cfg, "020_station_camera")
+        assert "acquisition_json" not in cols("recipe_tasks")
+        assert "camera_url" in cols("stations")  # la 020 resta
+        command.upgrade(cfg, "head")  # e di nuovo su
+        assert "acquisition_json" in cols("recipe_tasks")