add web

app/models/user_trade_items.py

@@ -0,0 +1,17 @@
+from app.extensions import db   
+
+class UserTradeItem(db.Model):
+    id = db.Column(db.BigInteger, primary_key=True, autoincrement=True)
+    tradeid = db.Column(db.BigInteger, nullable=False, index=True)
+    userid = db.Column(db.BigInteger, nullable=False, index=True)
+    user_asset_id = db.Column(db.BigInteger, db.ForeignKey("user_asset.id"), nullable=False)
+
+    userasset = db.relationship("UserAsset", backref="tradeitems", lazy=True)
+
+    def __init__(self, tradeid : int, userid : int, user_asset_id : int):
+        self.tradeid = tradeid
+        self.userid = userid
+        self.user_asset_id = user_asset_id
+    
+    def __repr__(self):
+        return f"<UserTradeItem {self.id} {self.tradeid} {self.userid} {self.user_asset_id}>"