Refactor code structure for improved readability and maintainability

services/bff/app/db.py

@@ -0,0 +1,34 @@
+from collections.abc import Generator
+from time import sleep
+
+from sqlalchemy import MetaData, create_engine, text
+from sqlalchemy.exc import OperationalError
+from sqlalchemy.orm import Session, sessionmaker
+
+from app.core import settings
+
+engine = create_engine(settings.database_url, pool_pre_ping=True)
+SessionLocal = sessionmaker(autocommit=False, autoflush=False, bind=engine)
+
+
+def create_schema(metadata: MetaData, attempts: int = 30, delay_seconds: int = 2) -> None:
+    last_error: OperationalError | None = None
+    for _ in range(attempts):
+        try:
+            with engine.begin() as connection:
+                connection.execute(text("SELECT 1"))
+                metadata.create_all(bind=connection)
+            return
+        except OperationalError as exc:
+            last_error = exc
+            sleep(delay_seconds)
+    if last_error:
+        raise last_error
+
+
+def get_db() -> Generator[Session]:
+    db = SessionLocal()
+    try:
+        yield db
+    finally:
+        db.close()