diff --git a/web_interface/blueprints/api_v3/__init__.py b/web_interface/blueprints/api_v3/__init__.py
index 7bebe211..8d80e0af 100644
--- a/web_interface/blueprints/api_v3/__init__.py
+++ b/web_interface/blueprints/api_v3/__init__.py
@@ -18,8 +18,6 @@ everything they need has to exist first.
 from flask import Blueprint, request, jsonify, Response
 import contextlib
 import json
-import signal
-import contextlib
 import os
 import re
 import stat
@@ -1971,18 +1969,23 @@ def _mqtt_bridge_service_state() -> Dict[str, Any]:
     return state
 
 def _read_mqtt_bridge_config() -> Dict[str, Any]:
-    """Stored config overlaid on the defaults. Missing file is not an error."""
-    config = dict(_MQTT_BRIDGE_DEFAULTS)
-    config['mqtt_password'] = None
+    """Stored config overlaid on the defaults. Missing file is not an error.
+
+    Named `settings`, not `config`: this module imports a submodule called
+    `config` at the bottom for its route side effects, and a local of the same
+    name shadows it.
+    """
+    settings = dict(_MQTT_BRIDGE_DEFAULTS)
+    settings['mqtt_password'] = None
     try:
         if _MQTT_BRIDGE_CONFIG.is_file():
             with open(_MQTT_BRIDGE_CONFIG, encoding='utf-8') as handle:
                 stored = json.load(handle)
             if isinstance(stored, dict):
-                config.update(stored)
+                settings.update(stored)
     except (OSError, json.JSONDecodeError) as err:
         logger.warning('Could not read %s: %s', _MQTT_BRIDGE_CONFIG, err)
-    return config
+    return settings
 
 def _coerce_mqtt_bridge_value(key: str, raw: Any) -> Tuple[Any, Optional[str]]:
     """Validate one submitted field. Returns (value, error)."""
diff --git a/web_interface/blueprints/api_v3/starlark.py b/web_interface/blueprints/api_v3/starlark.py
index c6276851..98c0f9c5 100644
--- a/web_interface/blueprints/api_v3/starlark.py
+++ b/web_interface/blueprints/api_v3/starlark.py
@@ -3,16 +3,19 @@
 Routes decorate the shared `api_v3` Blueprint from ._common, so their
 endpoint names are unchanged by living here.
 """
+import signal
+
 from web_interface.blueprints.api_v3 import (
     PROJECT_ROOT, Path, _PIXLET_EDITOR_DEFAULT_PORT,
     _PIXLET_EDITOR_DEFAULT_TIMEOUT, _PIXLET_EDITOR_MAX_TIMEOUT,
     _PIXLET_EDITOR_SCRIPT, _PIXLET_EDITOR_STATE, _clear_pixlet_editor_state,
     _find_pixlet_binary, _install_star_file, _pixlet_editor_alive,
     _pixlet_editor_status, _read_pixlet_editor_state,
-    _standalone_render_starlark_app, _starlark_github_token,
-    _starlark_manifest_lock, _validate_and_sanitize_app_id,
+    _STARLARK_APPS_DIR, _standalone_render_starlark_app,
+    _starlark_github_token, _starlark_manifest_lock,
+    _validate_and_sanitize_app_id,
     _validate_starlark_app_path, _validate_timing_value, api_v3, contextlib,
-    describe_exception, json, jsonify, logger, os, request, shutil, signal,
+    describe_exception, json, jsonify, logger, os, request, shutil,
     subprocess, tempfile,
 )
 import web_interface.blueprints.api_v3 as _pkg