05/31 Phase 1: initial codes

app/models/receipt.py

@@ -0,0 +1,18 @@
+from app.extensions import db
+from datetime import datetime
+
+
+class Receipt(db.Model):
+    __tablename__ = 'receipts'
+
+    id = db.Column(db.Integer, primary_key=True)
+    filename = db.Column(db.String(255), nullable=False)
+    original_filename = db.Column(db.String(255), nullable=False)
+    file_size = db.Column(db.Integer, nullable=True)
+    mime_type = db.Column(db.String(50), nullable=True)
+    uploaded_at = db.Column(db.DateTime, default=datetime.utcnow)
+
+    transaction = db.relationship('Transaction', back_populates='receipt', uselist=False)
+
+    def __repr__(self):
+        return f'<Receipt {self.filename}>'