Keep Mongo operations online across Vault credential rotation

dev/test_local.py

@@ -4,6 +4,7 @@ import tempfile
 import unittest
 from unittest.mock import patch
 
+import agents
 import bootstrap
 import images
 from vault import Vault
@@ -33,6 +34,14 @@ class Releases(unittest.TestCase):
             self.assertEqual(target.read_text(), 'previous build')
 
 
+class AgentContract(unittest.TestCase):
+    def test_database_lease_does_not_trigger_process_restart(self):
+        for service in ['bff', 'notifications']:
+            config = agents.config(service)
+            self.assertNotIn('database/creds/', config)
+            self.assertNotIn('SXCHNGE_MONGO_URI', config)
+
+
 class Bootstrap(unittest.TestCase):
     def test_missing_resend_credentials_stops_before_product_start(self):
         with tempfile.TemporaryDirectory() as temporary: