database.py

import os
import datetime
from sqlalchemy import create_engine, Column, Integer, String, Float, ForeignKey, DateTime
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Fetch database host from environment variables (defaults to localhost for local dev)
DB_HOST = os.getenv("DB_HOST", "localhost")
SQLALCHEMY_DATABASE_URL = f"postgresql://admin:password@{DB_HOST}:5432/risk_db"

engine = create_engine(SQLALCHEMY_DATABASE_URL)
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
Base = declarative_base()

class Account(Base):
    __tablename__ = "accounts"
    
    id = Column(Integer, primary_key=True, index=True)
    customer_name = Column(String)
    balance = Column(Float, default=0.0)
    status = Column(String, default="active")

class Transaction(Base):
    __tablename__ = "transactions"
    
    id = Column(Integer, primary_key=True, index=True)
    account_id = Column(Integer, ForeignKey("accounts.id"))
    amount = Column(Float)
    timestamp = Column(DateTime, default=datetime.datetime.utcnow)
    status = Column(String)

# Initialise database schema
Base.metadata.create_all(bind=engine)