project structure and database

backend/config.py

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+import os
+
+from dotenv import load_dotenv
+
+load_dotenv()
+
+# Database
+PG_LOGIN = os.environ.get("PG_LOGIN")
+PG_PASSWORD = os.environ.get("PG_PASSWORD")
+PG_PORT = os.environ.get("PG_PORT")
+PG_DATABASE = os.environ.get("PG_DATABASE")
+PG_HOST = os.environ.get("PG_HOST")
+
+SECRET_KEY = os.environ.get("SECRET_KEY")

backend/dependecies.py

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+from typing import Annotated
+
+from fastapi import Depends
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from backend.session import get_session
+from schemas.base import PaginationSchema
+from utils.pagination import pagination_parameters
+
+SessionDependency = Annotated[AsyncSession, Depends(get_session)]
+PaginationDependency = Annotated[PaginationSchema, Depends(pagination_parameters)]

backend/session.py

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+from typing import AsyncGenerator
+
+from sqlalchemy.ext.asyncio import create_async_engine, AsyncSession
+from sqlalchemy.orm import sessionmaker
+
+from .config import PG_DATABASE, PG_HOST, PG_PASSWORD, PG_LOGIN
+
+DATABASE_URL = f"postgresql+asyncpg://{PG_LOGIN}:{PG_PASSWORD}@{PG_HOST}/{PG_DATABASE}"
+engine = create_async_engine(DATABASE_URL)
+session_maker = sessionmaker(
+    engine,
+    class_=AsyncSession,
+    expire_on_commit=False,
+    autocommit=False,
+    autoflush=False,
+)
+
+
+async def get_session() -> AsyncGenerator[AsyncSession, None]:
+    async with session_maker() as session:
+        yield session