fix(campaign): persist full crawl snapshots

tests/test_promo_persistence_contract.py

@@ -0,0 +1,40 @@
+from pathlib import Path
+
+
+ROOT = Path(__file__).resolve().parents[1]
+
+
+def test_promo_crawlers_append_full_snapshots_for_unchanged_items():
+    scheduler_source = (ROOT / "scheduler.py").read_text(encoding="utf-8")
+
+    assert 'status_change=status_change if is_changed else "ACTIVE"' in scheduler_source
+    assert "snapshot_count = 0" in scheduler_source
+    assert "snapshot_count += 1" in scheduler_source
+    assert '"snapshot_records": snapshot_count' in scheduler_source
+    assert "無變動快照已寫入" in scheduler_source
+    assert "Snapshot Written" in scheduler_source
+    assert "Skip Write" not in scheduler_source
+    assert "無變動跳過" not in scheduler_source
+
+
+def test_promo_product_model_contains_crawled_fields_needed_for_history():
+    model_source = (ROOT / "database/edm_models.py").read_text(encoding="utf-8")
+
+    for field in [
+        "batch_id",
+        "crawled_at",
+        "time_slot",
+        "activity_time_text",
+        "session_time_text",
+        "i_code",
+        "name",
+        "price",
+        "discount_text",
+        "url",
+        "image_url",
+        "previous_price",
+        "remain_qty",
+        "status_change",
+        "page_type",
+    ]:
+        assert field in model_source