feat(graph): add clone_graph and delete_graph to GraphitiBackend via APOC

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

backend/app/graph/graphiti_backend.py

@@ -520,6 +520,39 @@ class GraphitiBackend(GraphBackend):
             )
         )
 
+    async def _execute_neo4j_query(self, query: str, parameters: dict = None):
+        """Execute a raw Cypher query against Neo4j via the sync driver in the shared event loop."""
+        result = await asyncio.get_event_loop().run_in_executor(
+            None,
+            lambda: self._client.driver.execute_query(query, **({"parameters_": parameters} if parameters else {}))
+        )
+        return result
+
+    async def clone_graph(self, src_group_id: str, dst_group_id: str) -> None:
+        """Clone all nodes and relationships from src_group_id to dst_group_id."""
+        clone_nodes_query = """
+            MATCH (n) WHERE n.group_id = $src
+            WITH n, properties(n) AS props
+            CREATE (m) SET m = props SET m.group_id = $dst
+        """
+        await self._execute_neo4j_query(clone_nodes_query, {"src": src_group_id, "dst": dst_group_id})
+
+        clone_rels_query = """
+            MATCH (n)-[r]->(m)
+            WHERE n.group_id = $src AND m.group_id = $src
+            MATCH (n2 {uuid: n.uuid, group_id: $dst})
+            MATCH (m2 {uuid: m.uuid, group_id: $dst})
+            CALL apoc.create.relationship(n2, type(r), properties(r), m2) YIELD rel
+            SET rel.group_id = $dst
+            RETURN rel
+        """
+        await self._execute_neo4j_query(clone_rels_query, {"src": src_group_id, "dst": dst_group_id})
+
+    async def delete_graph_async(self, group_id: str) -> None:
+        """Delete all nodes and relationships for a given group_id (async version)."""
+        delete_query = "MATCH (n) WHERE n.group_id = $gid DETACH DELETE n"
+        await self._execute_neo4j_query(delete_query, {"gid": group_id})
+
     def delete_graph(self, graph_id: str) -> None:
         _run_async(
             self._client.driver.execute_query(

backend/tests/test_graph_clone.py

@@ -0,0 +1,38 @@
+# backend/tests/test_graph_clone.py
+import pytest
+from unittest.mock import AsyncMock, MagicMock, patch
+import asyncio
+
+def test_clone_graph_executes_two_queries():
+    """clone_graph should run exactly 2 Cypher queries: one for nodes, one for relationships."""
+    from backend.app.graph.graphiti_backend import GraphitiBackend
+
+    backend = GraphitiBackend.__new__(GraphitiBackend)
+
+    executed_queries = []
+    async def fake_execute_query(query, parameters=None, **kwargs):
+        executed_queries.append(query)
+        return []
+
+    backend._execute_neo4j_query = fake_execute_query
+    asyncio.run(backend.clone_graph("src_group", "dst_group"))
+
+    assert len(executed_queries) == 2
+    combined = " ".join(executed_queries).lower()
+    assert "group_id" in combined
+
+def test_delete_graph_executes_detach_delete():
+    """delete_graph should run a DETACH DELETE query."""
+    from backend.app.graph.graphiti_backend import GraphitiBackend
+
+    backend = GraphitiBackend.__new__(GraphitiBackend)
+
+    executed_queries = []
+    async def fake_execute_query(query, parameters=None, **kwargs):
+        executed_queries.append(query)
+        return []
+
+    backend._execute_neo4j_query = fake_execute_query
+    asyncio.run(backend.delete_graph_async("group_to_delete"))
+
+    assert any("DETACH DELETE" in q for q in executed_queries)