"""Database configuration"""
from sqlalchemy import create_engine
from sqlalchemy.ext.declarative import declarative_base
from sqlalchemy.orm import sessionmaker
import os

SQLALCHEMY_DATABASE_URL = os.getenv(
    "DATABASE_URL", "postgresql://postgres:postgres123@postgres:5432/support_db"
)

engine = create_engine(
    SQLALCHEMY_DATABASE_URL,
    pool_pre_ping=True,
    pool_size=5,
    max_overflow=10
)

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

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