Fix strftime error by handling date formatting in database layer

core/database.py

@@ -73,4 +73,14 @@ class StellarDB:
             conn.row_factory = sqlite3.Row
             cursor = conn.cursor()
             cursor.execute('SELECT * FROM tasks ORDER BY created_at DESC')
-            return [dict(row) for row in cursor.fetchall()]
+            tasks = []
+            for row in cursor.fetchall():
+                task = dict(row)
+                # 确保 created_at 是字符串格式，方便模板显示
+                if isinstance(task['created_at'], datetime):
+                    task['created_at'] = task['created_at'].strftime('%Y-%m-%d %H:%M:%S')
+                elif isinstance(task['created_at'], str):
+                    # 如果已经是字符串（SQLite 默认返回），保留前 19 位 (YYYY-MM-DD HH:MM:SS)
+                    task['created_at'] = task['created_at'][:19]
+                tasks.append(task)
+            return tasks

templates/index.html

@@ -172,7 +172,7 @@
                     <div class="p-3 rounded-xl bg-white/5 border border-white/5 text-sm cursor-pointer hover:bg-white/10 hover:border-white/20 transition-all group" onclick="showTaskDetail('{{ task.id }}')">
                         <div class="flex justify-between mb-1">
                             <span class="font-mono text-[10px] text-blue-400">#{{ task.id }}</span>
-                            <span class="text-[9px] text-gray-500">{{ task.created_at.strftime('%H:%M:%S') if task.created_at else '' }}</span>
+                            <span class="text-[9px] text-gray-500">{{ task.created_at if task.created_at else '' }}</span>
                         </div>
                         <p class="truncate text-gray-300 group-hover:text-white transition-colors">{{ task.description }}</p>
                         <div class="mt-2 flex items-center text-[9px] text-gray-500">