fix: harden wallet balances and service startup

src/main.py

@@ -74,8 +74,13 @@ async def lifespan(app: FastAPI) -> AsyncGenerator[None, None]:
         path=settings.VAULT_CRYPTO_MASTER_KEY_PATH,
     )
     logger.info('Crypto master key loaded from Vault')
-    yield
-    logger.info(f'B2B service instance ended with id {instance_id}')
+    try:
+        yield
+    finally:
+        sched = getattr(app.state,'jwt_keys_scheduler',None)
+        if sched:
+            sched.shutdown(wait=False)
+        logger.info(f'B2B service instance ended with id {instance_id}')
 
 
 app: FastAPI = FastAPI(
@@ -111,7 +116,7 @@ app.add_middleware(
 app.add_middleware(
     CORSMiddleware,
     allow_origins=[],
-    allow_origin_regex='.*',
+    allow_origin_regex=settings.CORS_ALLOW_ORIGIN_REGEX,
     allow_credentials=True,
     allow_methods=['*'],
     allow_headers=['*'],