инициализировал проект api

.gitignore

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+/api/.env

api/app/core/config.py

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+from pydantic import BaseSettings
+
+
+class Settings(BaseSettings):
+    DATABASE_URL: str = "postgresql+asyncpg://user:password@localhost:5432/dbname"
+
+    class Config:
+        env_file = ".env"
+
+
+settings = Settings()

api/app/infrastructure/database/session.py

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+from sqlalchemy.ext.asyncio import AsyncSession, create_async_engine
+from sqlalchemy.orm import sessionmaker
+from app.core.config import settings
+
+engine = create_async_engine(settings.DATABASE_URL, echo=True)
+
+async_session_maker = sessionmaker(
+    bind=engine, class_=AsyncSession, expire_on_commit=False
+)
+
+async def get_db():
+    async with async_session_maker() as session:
+        yield session