diff --git a/pipeline_service/project_capability.py b/pipeline_service/project_capability.py
index ff7fde7..dd2d2b3 100644
--- a/pipeline_service/project_capability.py
+++ b/pipeline_service/project_capability.py
@@ -216,6 +216,28 @@ async def start_project(project_id, who=None, agent_id=None):
                              who=who, agent_id=agent_id)
 
 
+async def _clear_project_todos(sor, project_id):
+    """删除项目全部待办：人类任务 + 冒泡问题（待办角标/列表的两个来源）。
+    关联链：project_id 直挂 / iteration_id 经迭代 / task_id 经任务 / tenant_id（questions）。
+    调用方保证在 sd_iterations / pipeline_tasks 删除之前执行（子查询依赖）。
+    """
+    if not project_id:
+        return
+    for sql in [
+        "DELETE FROM pipeline_human_tasks WHERE project_id=${pid}$",
+        "DELETE FROM pipeline_human_tasks WHERE iteration_id IN (SELECT id FROM sd_iterations WHERE project_id=${pid}$)",
+        "DELETE FROM pipeline_human_tasks WHERE task_id IN (SELECT id FROM pipeline_tasks WHERE tenant_id=${pid}$)",
+        "DELETE FROM pipeline_agent_questions WHERE tenant_id=${pid}$",
+        "DELETE FROM pipeline_agent_questions WHERE task_id IN (SELECT id FROM pipeline_tasks WHERE tenant_id=${pid}$)",
+    ]:
+        try:
+            await sor.sqlExe(sql, {"pid": project_id})
+        except Exception as e:
+            logger.warning("clear_project_todos failed: %s err=%s", sql, e)
+    await sor.sqlExe("COMMIT", {})
+    logger.info("clear_project_todos: project=%s done", project_id)
+
+
 async def complete_project(project_id, who=None, agent_id=None):
     """完成项目：active → completed。"""
     return await _transition(project_id, S_ACTIVE, S_COMPLETED, 'complete',
@@ -223,13 +245,18 @@ async def complete_project(project_id, who=None, agent_id=None):
 
 
 async def archive_project(project_id, who=None, agent_id=None):
-    """归档项目：completed → archived（也兼容 active → archived 强制归档）。"""
+    """归档项目：completed → archived（也兼容 active → archived 强制归档）。
+    归档成功后清空项目全部待办（2026-09-01）。"""
     ok, msg = await _transition(project_id, S_COMPLETED, S_ARCHIVED, 'archive',
                                 who=who, agent_id=agent_id)
+    if not ok:
+        ok, msg = await _transition(project_id, S_ACTIVE, S_ARCHIVED, 'archive',
+                                    who=who, agent_id=agent_id)
     if ok:
-        return ok, msg
-    return await _transition(project_id, S_ACTIVE, S_ARCHIVED, 'archive',
-                             who=who, agent_id=agent_id)
+        db, dbname = _get_db()
+        async with db.sqlorContext(dbname) as sor:
+            await _clear_project_todos(sor, project_id)
+    return ok, msg
 
 
 async def reopen_project(project_id, who=None, agent_id=None):
@@ -271,6 +298,8 @@ async def pause_project(project_id, who=None, agent_id=None):
                            from_state=cur, to_state=S_PAUSED,
                            who=_normalize_role(who), agent_id=agent_id,
                            detail=f"prev_state={cur}", sor=sor)
+        # 停止推进后清空项目全部待办（2026-09-01）：项目不再推进，遗留待办无意义且占角标
+        await _clear_project_todos(sor, project_id)
         return True, S_PAUSED
 
 
@@ -513,6 +542,10 @@ async def delete_project(project_id, who=None, agent_id=None, confirm=False):
         for sql in indirect:
             await sor.sqlExe(sql, {"pid": project_id})
 
+        # 2a. 清空项目全部待办（2026-09-01）：project_id 直挂 + iteration/task 关联。
+        #     必须在 sd_iterations / pipeline_tasks 删除之前（子查询依赖）。
+        await _clear_project_todos(sor, project_id)
+
         # 2b. 任务关联表：先取本项目的任务 id，再删 task_id 指向它们的行
         #     （pipeline_deliverables 等同时有 project_id 和 task_id 两列，仅按 project_id
         #      删会漏掉「项目删除时 task 已先被删、project_id 已失效」的残留）