database.py

"""
Database configuration for the Litigation Simulator.

This module handles the database connection and session management
using SQLAlchemy.
"""

import os
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker

# Get database URL from environment variable or use default
DATABASE_URL = os.getenv("DATABASE_URL", "postgresql://username:password@localhost:5432/dbname")

# Create SQLAlchemy engine
engine = create_engine(DATABASE_URL)

# Create sessionmaker
SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)

# Create base class for declarative models
Base = declarative_base()

def get_db():
    """
    Get a database session.
    
    Yields:
        Session: SQLAlchemy database session
    """
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()