app/db.py

from typing import AsyncGenerator
from app import app
from fastapi import Depends
from fastapi_users.db import SQLAlchemyBaseUserTableUUID, SQLAlchemyUserDatabase
from sqlalchemy.ext.asyncio import AsyncSession, async_sessionmaker, create_async_engine
from sqlalchemy.orm import DeclarativeBase

from sqlalchemy import URL

db_url = URL.create(
    "postgresql+asyncpg",
    username="avnadmin",
    password="AVNS_u12fHxoNLBbzD8TGpqN",  # plain (unescaped) text
    host="pg-opengenai-opengenai.b.aivencloud.com",
    database="defaultdb",
    port=14535,
)


DATABASE_URL = db_url
#DATABASE_URL = "sqlite+aiosqlite:///./test.db"


class Base(DeclarativeBase):
    pass


class User(SQLAlchemyBaseUserTableUUID, Base):
    pass


engine = create_async_engine(DATABASE_URL, echo=True)
async_session_maker = async_sessionmaker(engine,
                     #class_=AsyncSession,
    autoflush=True,
    autocommit=False,
    expire_on_commit=False,                   
                                        )


async def create_db_and_tables():
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all)


async def get_async_session() -> AsyncGenerator[AsyncSession, None]:
    async with async_session_maker() as session:
        yield session


async def get_user_db(session: AsyncSession = Depends(get_async_session)):
    yield SQLAlchemyUserDatabase(session, User)


async def connect() -> None:
    async with engine.begin() as conn:
        await conn.run_sync(Base.metadata.create_all, checkfirst=True)


async def disconnect() -> None:
    if engine:
        await engine.dispose()