diff --git a/src/ai/backend/manager/scheduler/dispatcher.py b/src/ai/backend/manager/scheduler/dispatcher.py
index 2fa8eab76fb..f98428579cc 100644
--- a/src/ai/backend/manager/scheduler/dispatcher.py
+++ b/src/ai/backend/manager/scheduler/dispatcher.py
@@ -301,15 +301,12 @@ def _pipeline(r: Redis) -> RedisPipeline:
                     )
                     result = await db_sess.execute(query)
                     schedulable_scaling_groups = [row.scaling_group for row in result.fetchall()]
-                produce_do_prepare = False
                 for sgroup_name in schedulable_scaling_groups:
                     try:
                         kernel_agent_bindings = await self._schedule_in_sgroup(
                             sched_ctx,
                             sgroup_name,
                         )
-                        if kernel_agent_bindings:
-                            produce_do_prepare = True
                         await redis_helper.execute(
                             self.redis_live,
                             lambda r: r.hset(
@@ -357,8 +354,6 @@ def _pipeline(r: Redis) -> RedisPipeline:
                         datetime.now(tzutc()).isoformat(),
                     ),
                 )
-                if produce_do_prepare:
-                    await self.event_producer.produce_event(DoPrepareEvent())
         except DBAPIError as e:
             if getattr(e.orig, "pgcode", None) == "55P03":
                 log.info(
@@ -463,7 +458,9 @@ async def _update():
             len(cancelled_sessions),
         )
         zero = ResourceSlot()
+        num_scheduled = 0
         kernel_agent_bindings_in_sgroup: list[KernelAgentBinding] = []
+
         while len(pending_sessions) > 0:
             async with self.db.begin_readonly_session() as db_sess:
                 candidate_agents = await list_schedulable_agents_by_sgroup(db_sess, sgroup_name)
@@ -734,6 +731,9 @@ async def _update_session_status_data() -> None:
                 continue
             else:
                 kernel_agent_bindings_in_sgroup.extend(kernel_agent_bindings)
+            num_scheduled += 1
+        if num_scheduled > 0:
+            await self.event_producer.produce_event(DoPrepareEvent())
         return kernel_agent_bindings_in_sgroup
 
     async def _filter_agent_by_container_limit(