"""SQLAlchemy session setup for central PostgreSQL only."""
from sqlalchemy import create_engine, text
from sqlalchemy.orm import sessionmaker
from .config import settings

engine = create_engine(settings.database_url, pool_pre_ping=True)
SessionLocal = sessionmaker(bind=engine, expire_on_commit=False)

def database_is_available() -> bool:
    try:
        with engine.connect() as connection:
            connection.execute(text("SELECT 1"))
        return True
    except Exception:
        return False