接口跑通，基础功能全部实现

migrate_add_wx_fields.py

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+"""
+数据库迁移：给 users 表添加微信登录字段
+运行方式: python migrate_add_wx_fields.py
+"""
+import sqlite3
+import os
+
+DB_PATHS = [
+    "weibo_hotsign.db",
+    "backend/weibo_hotsign.db",
+]
+
+def migrate(db_path):
+    if not os.path.exists(db_path):
+        print(f"  跳过 {db_path}（文件不存在）")
+        return
+
+    conn = sqlite3.connect(db_path)
+    cursor = conn.cursor()
+
+    cursor.execute("PRAGMA table_info(users)")
+    columns = {row[1] for row in cursor.fetchall()}
+
+    added = []
+    for col in ["wx_openid", "wx_nickname", "wx_avatar"]:
+        if col not in columns:
+            cursor.execute(f"ALTER TABLE users ADD COLUMN {col} TEXT")
+            added.append(col)
+
+    # 创建唯一索引
+    try:
+        cursor.execute("CREATE UNIQUE INDEX IF NOT EXISTS idx_users_wx_openid ON users(wx_openid)")
+    except Exception:
+        pass
+
+    conn.commit()
+    conn.close()
+
+    if added:
+        print(f"  ✅ {db_path}: 添加了 {', '.join(added)}")
+    else:
+        print(f"  ✅ {db_path}: 字段已存在，无需迁移")
+
+if __name__ == "__main__":
+    print("正在迁移数据库...")
+    for p in DB_PATHS:
+        migrate(p)
+    print("迁移完成！")