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flask-test/models.py

+from datetime import datetime
+from sqlalchemy import Integer, String, DateTime
+from sqlalchemy.orm import DeclarativeBase
+from sqlalchemy.orm import mapped_column
+
+
+class Base(DeclarativeBase):
+    pass
+
+
+class Customer(Base):
+    __tablename__ = "customers"
+
+    id = mapped_column(String, primary_key=True)
+    first_name = mapped_column(String(50), nullable=False)
+    email = mapped_column(String, nullable=False)
+
+
+class Product(Base):
+    __tablename__ = "products"
+
+    id = mapped_column(String, primary_key=True)
+    name = mapped_column(String(50), nullable=False)
+    recycling_type = mapped_column(Integer, nullable=False)
+    reward_value = mapped_column(Integer, nullable=False)
+
+
+class Return(Base):
+    __tablename__ = "returns"
+
+    id = mapped_column(String, primary_key=True)
+    customer_id = mapped_column(String, nullable=False)
+    product_id = mapped_column(String, nullable=False)
+    return_date = mapped_column(DateTime, nullable=False, default=datetime.utcnow)
+    reward_value = mapped_column(Integer, nullable=False)