合并JWL，WZY，TRM代码
Change-Id: Ifb4fcad3c06733e1e005e7d8d9403e3561010fb4
diff --git a/Merge/back_trm/app/models/__init__.py b/Merge/back_trm/app/models/__init__.py
new file mode 100644
index 0000000..f726a19
--- /dev/null
+++ b/Merge/back_trm/app/models/__init__.py
@@ -0,0 +1,8 @@
+from sqlalchemy.ext.declarative import declarative_base
+
+Base = declarative_base()
+
+# 先定义好 Base，再把所有 model import 进来，让 SQLAlchemy 一次性注册它们
+from .users import User
+from .topics import Topic
+from .post import Post
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