合并JWL，WZY，TRM代码
Change-Id: Ifb4fcad3c06733e1e005e7d8d9403e3561010fb4
diff --git a/Merge/back_wzy/models/topic.py b/Merge/back_wzy/models/topic.py
new file mode 100644
index 0000000..d0e5a2e
--- /dev/null
+++ b/Merge/back_wzy/models/topic.py
@@ -0,0 +1,14 @@
+# models/topic.py
+from extensions import db
+from datetime import datetime
+
+class Topic(db.Model):
+ __tablename__ = 'topics'
+
+ id = db.Column(db.Integer, primary_key=True)
+ name = db.Column(db.String(100), unique=True, nullable=False)
+ description = db.Column(db.Text)
+ status = db.Column(db.Enum('active', 'archived'), default='active', nullable=False)
+ created_at = db.Column(db.DateTime, default=datetime.utcnow, nullable=False)
+
+ posts = db.relationship('Post', backref='topic', lazy='dynamic', cascade='all, delete')