合并JWL，WZY，TRM代码
Change-Id: Ifb4fcad3c06733e1e005e7d8d9403e3561010fb4
diff --git a/Merge/back_wzy/models/__init__.py b/Merge/back_wzy/models/__init__.py
new file mode 100644
index 0000000..f7cef7b
--- /dev/null
+++ b/Merge/back_wzy/models/__init__.py
@@ -0,0 +1,12 @@
+# models/__init__.py
+# --------------------------------------------------
+# 绝**对**不要**从** app.py 导入 db！
+# 改成：
+from extensions import db
+
+from .user import User
+from .topic import Topic
+from .tag import Tag
+from .post import Post, post_tags
+from .behavior import Behavior
+from .comment import Comment