add offset param (#9977)

server.py

@@ -645,7 +645,14 @@ class PromptServer():
             max_items = request.rel_url.query.get("max_items", None)
             if max_items is not None:
                 max_items = int(max_items)
-            return web.json_response(self.prompt_queue.get_history(max_items=max_items))
+
+            offset = request.rel_url.query.get("offset", None)
+            if offset is not None:
+                offset = int(offset)
+            else:
+                offset = -1
+
+            return web.json_response(self.prompt_queue.get_history(max_items=max_items, offset=offset))
 
         @routes.get("/history/{prompt_id}")
         async def get_history_prompt_id(request):