refactor(knowledge): keep latest version only

ai_knowledge_base_v2/apps/backend/tests/test_knowledge_admin.py

@@ -128,29 +128,7 @@ def test_batch_metadata_update_reports_missing_items():
         assert db.scalar(select(Knowledge).where(Knowledge.id == item.id)).knowledge_type == "qa"
 
 
-def test_rollback_switches_published_version_statuses():
-    with _database() as db:
-        item = _knowledge(db)
-        old_version = db.get(KnowledgeVersion, item.current_version_id)
-        snapshot = db.scalar(select(KnowledgeSourceSnapshot).where(KnowledgeSourceSnapshot.knowledge_id == item.id))
-        target = KnowledgeVersion(
-            knowledge_id=item.id,
-            snapshot_id=snapshot.id,
-            version_no=0,
-            status="superseded",
-            quality_status="passed",
-            processing_rule_version="test-v1",
-        )
-        db.add(target)
-        db.flush()
-        KnowledgePipelineService.rollback(db, item, target, admin_id=1, keep_open=True)
-        db.commit()
-        assert item.current_version_id == target.id
-        assert target.status == "published"
-        assert old_version.status == "superseded"
-
-
-def test_sync_automatically_replaces_current_version_and_keeps_rollback_history():
+def test_sync_automatically_replaces_current_version_and_removes_history():
     source_content = (
         "# 一、课程说明\n这是更新后的课程内容，同步成功后应当立即生效。\n\n"
         "# 二、练习一：静水流深静心\n选择舒适安全的姿势，觉察呼吸和身体，不适时立即停止。"
@@ -174,7 +152,12 @@ def test_sync_automatically_replaces_current_version_and_keeps_rollback_history(
 
         db.refresh(item)
         current = db.get(KnowledgeVersion, item.current_version_id)
-        previous = db.get(KnowledgeVersion, previous_version_id)
+        versions = db.scalars(
+            select(KnowledgeVersion).where(KnowledgeVersion.knowledge_id == item.id)
+        ).all()
+        snapshots = db.scalars(
+            select(KnowledgeSourceSnapshot).where(KnowledgeSourceSnapshot.knowledge_id == item.id)
+        ).all()
         manifest = db.scalar(select(KnowledgeManifest).where(KnowledgeManifest.version_id == current.id))
         cards = db.scalars(select(KnowledgeCard).where(KnowledgeCard.version_id == current.id)).all()
         publish_log = db.scalar(
@@ -185,7 +168,9 @@ def test_sync_automatically_replaces_current_version_and_keeps_rollback_history(
         assert job.mode == "replace"
         assert current.status == "published"
         assert current.quality_status == "passed"
-        assert previous.status == "superseded"
+        assert db.get(KnowledgeVersion, previous_version_id) is None
+        assert [version.id for version in versions] == [current.id]
+        assert [snapshot.id for snapshot in snapshots] == [current.snapshot_id]
         assert item.pending_version_id is None
         assert item.status == 1
         assert item.migration_status == "completed"