FIX: lowercase MAC normalization across project v0.3

Signed-off-by: jokob-sk <jokob.sk@gmail.com>

test/api_endpoints/test_dbquery_endpoints.py

@@ -26,7 +26,7 @@ def client():
 @pytest.fixture(scope="session")
 def test_mac():
     # Generate a unique MAC for each test run
-    return "AA:BB:CC:" + ":".join(f"{random.randint(0, 255):02X}" for _ in range(3))
+    return "aa:bb:cc:" + ":".join(f"{random.randint(0, 255):02X}" for _ in range(3))
 
 
 def auth_headers(token):