database.py

from sqlalchemy import create_engine
from sqlalchemy.orm import sessionmaker, declarative_base
from config import Config

SQLALCHEMY_DATABASE_URL = Config.SQLALCHEMY_DATABASE_URI

engine = create_engine(
    SQLALCHEMY_DATABASE_URL,
    connect_args={"check_same_thread": False} if "sqlite" in SQLALCHEMY_DATABASE_URL else {},
    pool_size=10,
    max_overflow=20,
    pool_timeout=30,
    pool_recycle=1800,
    pool_pre_ping=True,
)

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

def get_db():
    db = SessionLocal()
    try:
        yield db
    finally:
        db.close()

def init_db():
    import models.usuario
    import models.formulario
    import models.resposta
    import models.respostas_formulario
    import models.propostas
    Base.metadata.create_all(bind=engine)