性能优化: 项目页/看板/DAG/知识库/交付 加载提速

- /api/tasks 列表接口改用轻量序列化，去掉 output_text/error 大字段
  (300KB -> 6KB, 详情接口 /api/tasks/<id> 仍返回完整数据)
- /api/tasks/trash 与 /api/projects/<id>/dag 同步轻量化
- 前端同一项目内切换 tab 不再重复拉取项目/任务/Worker/事件,
  复用 projCtx 缓存; 离开项目页时自动清缓存
- /api/projects/<id>/events 各来源加 LIMIT, 避免全表加载

app.py

@@ -708,7 +708,7 @@ def tasks():
         visible = _visible_project_ids()
         if visible is not None:
             rows = [r for r in rows if r['project_id'] in visible]
-    return jsonify({'ok': True, 'data': [db.serialize_task(t) for t in rows]})
+    return jsonify({'ok': True, 'data': [db.serialize_task_light(t) for t in rows]})
 
 
 @app.route('/api/tasks/<int:tid>', methods=['GET', 'PUT', 'DELETE'])
@@ -779,7 +779,7 @@ def tasks_trash():
         visible = _visible_project_ids()
         if visible is not None:
             rows = [r for r in rows if r['project_id'] in visible]
-    return jsonify({'ok': True, 'data': [db.serialize_task(t) for t in rows]})
+    return jsonify({'ok': True, 'data': [db.serialize_task_light(t) for t in rows]})
 
 
 @app.route('/api/tasks/<int:tid>/trash', methods=['POST'])
@@ -1104,18 +1104,21 @@ def project_events(pid):
     limit = min(int(request.args.get('limit', 200)), 500)
     rows = []
     # AI 主管动态
-    for r in db.q('SELECT * FROM project_logs WHERE project_id=?', (pid,)):
+    for r in db.q('SELECT * FROM project_logs WHERE project_id=? ORDER BY id DESC LIMIT ?',
+                  (pid, limit)):
         rows.append({'id': f'p{r["id"]}', 'kind': 'autolog', 'level': r['level'],
                      'message': r['message'], 'created_at': r['created_at'], 'task_id': None,
                      'task_title': None})
     # 任务日志（带任务标题，可定位）
     for r in db.q('SELECT l.*, t.title AS task_title FROM task_logs l '
-                  'JOIN tasks t ON t.id=l.task_id WHERE t.project_id=? AND t.deleted=0', (pid,)):
+                  'JOIN tasks t ON t.id=l.task_id WHERE t.project_id=? AND t.deleted=0 '
+                  'ORDER BY l.id DESC LIMIT ?', (pid, limit)):
         rows.append({'id': f'l{r["id"]}', 'kind': 'task', 'level': r['level'],
                      'message': r['message'], 'created_at': r['created_at'],
                      'task_id': r['task_id'], 'task_title': r['task_title']})
     # 交付记录
-    for r in db.q('SELECT * FROM project_deliverables WHERE project_id=?', (pid,)):
+    for r in db.q('SELECT * FROM project_deliverables WHERE project_id=? ORDER BY id DESC LIMIT ?',
+                  (pid, limit)):
         rows.append({'id': f'd{r["id"]}', 'kind': 'deliver', 'level': 'success',
                      'message': f'📦 {r["note"]}（{r["name"]}）', 'created_at': r['created_at'],
                      'task_id': None, 'task_title': None})
@@ -1275,7 +1278,7 @@ def project_dag(pid):
     rows = db.q('SELECT * FROM tasks WHERE project_id=? AND deleted=0 ORDER BY id', (pid,))
     nodes, edges, id_map = [], [], {}
     for t in rows:
-        node = db.serialize_task(t)
+        node = db.serialize_task_light(t)
         nodes.append(node)
         id_map[t['id']] = node
     for t in nodes:

db.py

@@ -631,6 +631,16 @@ def serialize_task(t):
     return t
 
 
+def serialize_task_light(t):
+    """轻量序列化（列表接口用）：去掉大字段 output_text / error，
+    看板、DAG、回收站等列表视图不需要它们，可显著减小传输体积。
+    详情接口 /api/tasks/<id> 仍返回完整数据。"""
+    t = serialize_task(t)
+    t.pop('output_text', None)
+    t.pop('error', None)
+    return t
+
+
 def get_setting(key, default=''):
     r = q('SELECT value FROM settings WHERE key=?', (key,), one=True)
     return r['value'] if r else default

static/app.js

@@ -100,6 +100,8 @@ function router() {
   const hash = location.hash.replace(/^#\//, '') || 'dashboard';
   const parts = hash.split('/');
   const name = parts[0];
+  // 离开项目页时丢弃项目缓存，避免下次进入用旧数据
+  if (name !== 'project') projCtx = null;
   const fn = routes[name] || pageDashboard;
   const navMap = {project:'projects', api:'api', settings:'settings', alerts:'alerts'};
   $$('#sidebar nav a').forEach(a => a.classList.toggle('active', a.dataset.route === (navMap[name] || name)));
@@ -274,11 +276,20 @@ let projCtx = null;   // {pid, p, tasks, workers, tab, autoLogs}
 let projAutoTimer = null;
 
 async function pageProject([pid, tab]) {
+  tab = tab || 'kanban';
+  // 同一项目内切 tab：复用已加载的数据，不再重新拉项目/任务/Worker/事件
+  if (projCtx && String(projCtx.pid) === String(pid)) {
+    projCtx.tab = tab;
+    renderProjectShell();
+    renderActiveTab();
+    startProjAutoPoll();   // 重启轮询（router 已清掉定时器）
+    return;
+  }
   const p = (await api(`/api/projects/${pid}`)).data;
   const tasks = (await api(`/api/tasks?project_id=${pid}`)).data;
   const workers = (await api('/api/workers')).data;
   const events = (await api(`/api/projects/${pid}/events`)).data;
-  projCtx = {pid, p, tasks, workers, tab: tab || 'kanban', events};
+  projCtx = {pid, p, tasks, workers, tab, events};
   renderProjectShell();
   renderActiveTab();
   startProjAutoPoll();