init commit. Skeleton prepared

services/auth/src/app/db/session.py

@@ -0,0 +1,26 @@
+import os
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, DeclarativeBase
+from typing import Generator
+
+DEFAULT_DB_URL = "postgresql+psycopg2://postgres:postgres@postgres:5432/auth_db"
+
+class Base(DeclarativeBase):
+    pass
+
+DATABASE_URL = os.getenv("DATABASE_URL", DEFAULT_DB_URL)
+
+engine = create_engine(
+    DATABASE_URL,
+    pool_pre_ping=True,
+    future=True,
+)
+
+SessionLocal = sessionmaker(bind=engine, autoflush=False, autocommit=False)
+
+def get_db() -> Generator:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()