test(feedback): restore NO_LOAD_GRAPH_DB after each feedback test

Fold into the feedback commits during the cleanup pass.

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

Author: northdpole

application/tests/answer_feedback_test.py

@@ -1,13 +1,16 @@
 import os
 import unittest
+from unittest import mock
 
 from application import create_app, sqla
 from application.utils import answer_feedback as af
 
 
 class AnswerFeedbackTest(unittest.TestCase):
     def setUp(self) -> None:
-        os.environ["NO_LOAD_GRAPH_DB"] = "1"
+        patcher = mock.patch.dict(os.environ, {"NO_LOAD_GRAPH_DB": "1"})
+        patcher.start()
+        self.addCleanup(patcher.stop)
         self.app = create_app(mode="test")
         self.ctx = self.app.app_context()
         self.ctx.push()
@@ -82,7 +85,9 @@ def test_attach_answer_id_adds_id_only_when_logged(self) -> None:
 
 class McpRatingTest(unittest.TestCase):
     def setUp(self) -> None:
-        os.environ["NO_LOAD_GRAPH_DB"] = "1"
+        patcher = mock.patch.dict(os.environ, {"NO_LOAD_GRAPH_DB": "1"})
+        patcher.start()
+        self.addCleanup(patcher.stop)
         self.app = create_app(mode="test")
         self.ctx = self.app.app_context()
         self.ctx.push()
@@ -126,7 +131,9 @@ def test_rate_tool_is_listed_and_dispatches(self) -> None:
 
 class RestFeedbackTest(unittest.TestCase):
     def setUp(self) -> None:
-        os.environ["NO_LOAD_GRAPH_DB"] = "1"
+        patcher = mock.patch.dict(os.environ, {"NO_LOAD_GRAPH_DB": "1"})
+        patcher.start()
+        self.addCleanup(patcher.stop)
         self.app = create_app(mode="test")
         self.ctx = self.app.app_context()
         self.ctx.push()