Implement database integration for transactions and receipts, including CRUD operations and data retrieval endpoints

database.py

@@ -0,0 +1,75 @@
+from typing import Annotated
+
+from fastapi import Depends
+from sqlalchemy import Column, DateTime, Float, Integer, String, create_engine
+from sqlalchemy.ext.declarative import declarative_base
+from sqlalchemy.orm import Session, sessionmaker
+
+SQLALCHEMY_DATABASE_URL = "sqlite:///./sql_app.db"
+
+engine = create_engine(
+    SQLALCHEMY_DATABASE_URL, connect_args={"check_same_thread": False}
+)
+
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def get_db():
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()
+
+
+db_dependency = Annotated[Session, Depends(get_db)]
+Base = declarative_base()
+
+
+def create_db_tables():
+    Base.metadata.create_all(bind=engine)
+
+
+def clear_all_data():
+    """Clear all data from the database (useful for testing)"""
+    db = SessionLocal()
+    try:
+        db.query(Transaction).delete()
+        db.query(Receipt).delete()
+        db.commit()
+    finally:
+        db.close()
+
+
+# Transactions table
+class Transaction(Base):
+    __tablename__ = "transactions"
+
+    id = Column(Integer, primary_key=True, index=True)
+    transaction_id = Column(String, unique=True, index=True)
+    amount = Column(Float, nullable=False)
+    date = Column(DateTime, nullable=False)
+    vendor = Column(String, nullable=False)
+    description = Column(String, nullable=True)
+    category = Column(String, nullable=True)
+    tax_amount = Column(Float, nullable=True)
+    categorisation_id = Column(String, nullable=True)
+    user_id = Column(String, nullable=True)
+
+
+# Receipts table
+class Receipt(Base):
+    __tablename__ = "receipts"
+
+    id = Column(Integer, primary_key=True, index=True)
+    receipt_id = Column(String, unique=True, index=True)
+    file_id = Column(String, unique=True, index=True)
+    amount = Column(Float, nullable=False)
+    date = Column(DateTime, nullable=False)
+    vendor = Column(String, nullable=False)
+    description = Column(String, nullable=True)
+    category = Column(String, nullable=True)
+    tax_amount = Column(Float, nullable=True)
+    confidence = Column(Float, nullable=True)
+    extraction_success = Column(String, nullable=True)
+    error_message = Column(String, nullable=True)