diff --git a/py/core/main/api/v3/graph_router.py b/py/core/main/api/v3/graph_router.py
index 6f1690339..866923094 100644
--- a/py/core/main/api/v3/graph_router.py
+++ b/py/core/main/api/v3/graph_router.py
@@ -669,9 +669,7 @@ async def add_entity_to_graph(
             """
             Adds a list of entities to the graph by their IDs.
             """
-            raise NotImplementedError("Not implemented")
-        
-
+            return await self.services["kg"].documents.graph_handler.entities.add_to_graph(id, entity_ids)
 
         @self.router.delete(
             "/graphs/{id}/entities/{entity_id}",
@@ -710,7 +708,7 @@ async def remove_entity_from_graph(
             """
             Removes an entity from the graph by its ID.
             """
-            raise NotImplementedError("Not implemented")
+            return await self.services["kg"].documents.graph_handler.entities.remove_from_graph(id, [entity_id])
 
 
         @self.router.post(
@@ -750,7 +748,7 @@ async def add_relationship_to_graph(
             """
             Adds a list of relationships to the graph by their IDs.
             """
-            raise NotImplementedError("Not implemented")
+            return await self.services["kg"].documents.graph_handler.relationships.add_to_graph(id, relationship_ids)
         
 
 
@@ -791,7 +789,7 @@ async def remove_relationship_from_graph(
             """
             Removes a relationship from the graph by its ID.
             """
-            raise NotImplementedError("Not implemented")
+            return await self.services["kg"].documents.graph_handler.relationships.remove_from_graph(id, [relationship_id])
 
 
 
@@ -832,7 +830,7 @@ async def add_communities_to_graph(
             """
             Adds a list of communities to the graph by their IDs.
             """
-            raise NotImplementedError("Not implemented")
+            return await self.services["kg"].documents.graph_handler.communities.add_to_graph(id, community_ids)
         
 
 
@@ -873,5 +871,5 @@ async def remove_community_from_graph(
             """
             Removes a community from the graph by its ID.
             """
-            raise NotImplementedError("Not implemented")
+            return await self.services["kg"].documents.graph_handler.communities.remove_from_graph(id, [community_id])
 
diff --git a/py/core/providers/database/kg.py b/py/core/providers/database/kg.py
index 48933766a..bd352973e 100644
--- a/py/core/providers/database/kg.py
+++ b/py/core/providers/database/kg.py
@@ -319,6 +319,25 @@ async def delete(
             connection_manager=self.connection_manager,
         )
 
+    async def add_to_graph(self, graph_id: UUID, entity_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_entity")}
+            SET graph_ids = CASE 
+                WHEN graph_ids IS NULL THEN ARRAY[$1]
+                WHEN NOT ($1 = ANY(graph_ids)) THEN array_append(graph_ids, $1)
+                ELSE graph_ids
+            END
+            WHERE id = ANY($2)
+        """
+        return await self.connection_manager.execute_query(QUERY, [graph_id, entity_ids])
+
+    async def remove_from_graph(self, graph_id: UUID, entity_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_entity")}
+            SET graph_ids = array_remove(graph_ids, $1)
+            WHERE id = ANY($2)
+        """
+        return await self.connection_manager.execute_query(QUERY, [graph_id, entity_ids])
 
 class PostgresRelationshipHandler(RelationshipHandler):
     def __init__(self, *args: Any, **kwargs: Any) -> None:
@@ -488,6 +507,26 @@ async def delete(
         return await self.connection_manager.fetchrow_query(
             QUERY, [relationship_id]
         )
+    
+    async def add_to_graph(self, graph_id: UUID, relationship_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_relationship")}
+            SET graph_ids = CASE 
+                WHEN graph_ids IS NULL THEN ARRAY[$1]
+                WHEN NOT ($1 = ANY(graph_ids)) THEN array_append(graph_ids, $1)
+                ELSE graph_ids
+            END
+            WHERE id = ANY($2)
+        """
+        return await self.connection_manager.execute_query(QUERY, [graph_id, relationship_ids])
+    
+    async def remove_from_graph(self, graph_id: UUID, relationship_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_relationship")}
+            SET graph_ids = array_remove(graph_ids, $1)
+            WHERE id = ANY($2)
+        """
+        return await self.connection_manager.execute_query(QUERY, [graph_id, relationship_ids])
 
 
 class PostgresCommunityHandler(CommunityHandler):
@@ -607,6 +646,17 @@ async def get(
                 )
             ]
 
+    async def add_to_graph(self, graph_id: UUID, community_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_community")} SET graph_id = $1 WHERE id = ANY($2)
+        """
+        return await self.connection_manager.execute_query(QUERY, [graph_id, community_ids])
+    
+    async def remove_from_graph(self, graph_id: UUID, community_ids: list[UUID]) -> None:
+        QUERY = f"""
+            UPDATE {self._get_table_name("graph_community")} SET graph_id = NULL WHERE id = ANY($1)
+        """
+        return await self.connection_manager.execute_query(QUERY, [community_ids])
 
 class PostgresGraphHandler(GraphHandler):
     """Handler for Knowledge Graph METHODS in PostgreSQL."""