fix(settings): enforce valid default model roots

py/config.py

@@ -25,6 +25,31 @@ standalone_mode = (
 logger = logging.getLogger(__name__)
 
 
+def _resolve_valid_default_root(
+    current: str, primary_paths: List[str], name: str
+) -> str:
+    """Return a valid default root from the current primary path set."""
+
+    valid_paths = [path for path in primary_paths if isinstance(path, str) and path.strip()]
+    if not valid_paths:
+        return ""
+
+    if current in valid_paths:
+        return current
+
+    if current:
+        logger.info(
+            "Repaired stale %s from '%s' to '%s'",
+            name,
+            current,
+            valid_paths[0],
+        )
+    else:
+        logger.info("Auto-setting %s to '%s'", name, valid_paths[0])
+
+    return valid_paths[0]
+
+
 def _normalize_folder_paths_for_comparison(
     folder_paths: Mapping[str, Iterable[str]],
 ) -> Dict[str, Set[str]]:
@@ -197,25 +222,23 @@ class Config:
                         "Failed to rename legacy 'default' library: %s", rename_error
                     )
 
-            default_lora_root = comfy_library.get("default_lora_root", "")
+            default_lora_root = _resolve_valid_default_root(
-            if not default_lora_root and len(self.loras_roots) == 1:
+                comfy_library.get("default_lora_root", ""),
-                default_lora_root = self.loras_roots[0]
+                list(self.loras_roots or []),
+                "default_lora_root",
+            )
 
-            default_checkpoint_root = comfy_library.get("default_checkpoint_root", "")
+            default_checkpoint_root = _resolve_valid_default_root(
-            if (
+                comfy_library.get("default_checkpoint_root", ""),
-                not default_checkpoint_root
+                list(self.checkpoints_roots or []),
-                and self.checkpoints_roots
+                "default_checkpoint_root",
-                and len(self.checkpoints_roots) == 1
+            )
-            ):
-                default_checkpoint_root = self.checkpoints_roots[0]
 
-            default_embedding_root = comfy_library.get("default_embedding_root", "")
+            default_embedding_root = _resolve_valid_default_root(
-            if (
+                comfy_library.get("default_embedding_root", ""),
-                not default_embedding_root
+                list(self.embeddings_roots or []),
-                and self.embeddings_roots
+                "default_embedding_root",
-                and len(self.embeddings_roots) == 1
+            )
-            ):
-                default_embedding_root = self.embeddings_roots[0]
 
             metadata = dict(comfy_library.get("metadata", {}))
             metadata.setdefault("display_name", "ComfyUI")
@@ -706,7 +729,9 @@ class Config:
         return unique_paths
 
     @staticmethod
-    def _normalize_path_for_comparison(path: str, *, resolve_realpath: bool = False) -> str:
+    def _normalize_path_for_comparison(
+        path: str, *, resolve_realpath: bool = False
+    ) -> str:
         """Normalize a path for equality checks across platforms."""
         candidate = os.path.realpath(path) if resolve_realpath else path
         return os.path.normcase(os.path.normpath(candidate)).replace(os.sep, "/")

py/services/settings_manager.py

@@ -7,7 +7,17 @@ import logging
 from pathlib import Path
 from datetime import datetime, timezone
 from threading import Lock
-from typing import Any, Awaitable, Dict, Iterable, List, Mapping, Optional, Sequence, Tuple
+from typing import (
+    Any,
+    Awaitable,
+    Dict,
+    Iterable,
+    List,
+    Mapping,
+    Optional,
+    Sequence,
+    Tuple,
+)
 
 from platformdirs import user_config_dir
 
@@ -17,7 +27,11 @@ from ..utils.constants import (
     SUPPORTED_DOWNLOAD_SKIP_BASE_MODELS,
 )
 from ..utils.preview_selection import VALID_MATURE_BLUR_LEVELS
-from ..utils.settings_paths import APP_NAME, ensure_settings_file, get_legacy_settings_path
+from ..utils.settings_paths import (
+    APP_NAME,
+    ensure_settings_file,
+    get_legacy_settings_path,
+)
 from ..utils.tag_priorities import (
     PriorityTagEntry,
     collect_canonical_tags,
@@ -94,7 +108,9 @@ class SettingsManager:
         self._template_payload_cache_loaded = False
         self._original_disk_payload: Optional[Dict[str, Any]] = None
         self._preserve_disk_template = False
-        self._template_path = Path(__file__).resolve().parents[2] / "settings.json.example"
+        self._template_path = (
+            Path(__file__).resolve().parents[2] / "settings.json.example"
+        )
         self.settings = self._load_settings()
         self._migrate_setting_keys()
         self._ensure_default_settings()
@@ -120,7 +136,7 @@ class SettingsManager:
         """Load settings from file"""
         if os.path.exists(self.settings_file):
             try:
-                with open(self.settings_file, 'r', encoding='utf-8') as f:
+                with open(self.settings_file, "r", encoding="utf-8") as f:
                     data = json.load(f)
                 if isinstance(data, dict):
                     self._original_disk_payload = copy.deepcopy(data)
@@ -198,7 +214,9 @@ class SettingsManager:
             return None
 
         if not isinstance(data, dict):
-            logger.debug("settings.json.example is not a JSON object; ignoring template")
+            logger.debug(
+                "settings.json.example is not a JSON object; ignoring template"
+            )
             return None
 
         self._template_payload_cache = copy.deepcopy(data)
@@ -274,7 +292,9 @@ class SettingsManager:
             normalized_skip_paths = self.normalize_metadata_refresh_skip_paths(
                 self.settings.get("metadata_refresh_skip_paths")
             )
-            if normalized_skip_paths != self.settings.get("metadata_refresh_skip_paths"):
+            if normalized_skip_paths != self.settings.get(
+                "metadata_refresh_skip_paths"
+            ):
                 self.settings["metadata_refresh_skip_paths"] = normalized_skip_paths
                 updated_existing = True
         else:
@@ -288,9 +308,7 @@ class SettingsManager:
             if normalized_skip_base_models != self.settings.get(
                 "download_skip_base_models"
             ):
-                self.settings["download_skip_base_models"] = (
+                self.settings["download_skip_base_models"] = normalized_skip_base_models
-                    normalized_skip_base_models
-                )
                 updated_existing = True
         else:
             self.settings["download_skip_base_models"] = []
@@ -330,19 +348,19 @@ class SettingsManager:
         raw_top_level_paths = self.settings.get("folder_paths", {})
         normalized_top_level_paths: Dict[str, List[str]] = {}
         if isinstance(raw_top_level_paths, Mapping):
-            normalized_top_level_paths = self._normalize_folder_paths(raw_top_level_paths)
+            normalized_top_level_paths = self._normalize_folder_paths(
+                raw_top_level_paths
+            )
             if normalized_top_level_paths != raw_top_level_paths:
-                self.settings["folder_paths"] = copy.deepcopy(normalized_top_level_paths)
+                self.settings["folder_paths"] = copy.deepcopy(
+                    normalized_top_level_paths
+                )
 
         top_level_has_paths = self._has_configured_paths(normalized_top_level_paths)
 
         needs_library_bootstrap = not isinstance(libraries, dict) or not libraries
 
-        if (
+        if not needs_library_bootstrap and top_level_has_paths and len(libraries) == 1:
-            not needs_library_bootstrap
-            and top_level_has_paths
-            and len(libraries) == 1
-        ):
             only_library_payload = next(iter(libraries.values()))
             if isinstance(only_library_payload, Mapping):
                 folder_payload = only_library_payload.get("folder_paths")
@@ -354,7 +372,9 @@ class SettingsManager:
             library_payload = self._build_library_payload(
                 folder_paths=normalized_top_level_paths,
                 default_lora_root=self.settings.get("default_lora_root", ""),
-                default_checkpoint_root=self.settings.get("default_checkpoint_root", ""),
+                default_checkpoint_root=self.settings.get(
+                    "default_checkpoint_root", ""
+                ),
                 default_unet_root=self.settings.get("default_unet_root", ""),
                 default_embedding_root=self.settings.get("default_embedding_root", ""),
             )
@@ -376,7 +396,11 @@ class SettingsManager:
 
             if target_name:
                 candidate_payload = libraries.get(target_name)
-                if isinstance(candidate_payload, Mapping) and not self._has_configured_paths(candidate_payload.get("folder_paths")):
+                if isinstance(
+                    candidate_payload, Mapping
+                ) and not self._has_configured_paths(
+                    candidate_payload.get("folder_paths")
+                ):
                     seed_library_name = target_name
 
         sanitized_libraries: Dict[str, Dict[str, Any]] = {}
@@ -435,11 +459,17 @@ class SettingsManager:
         active_library = libraries.get(active_name, {})
         folder_paths = copy.deepcopy(active_library.get("folder_paths", {}))
         self.settings["folder_paths"] = folder_paths
-        self.settings["extra_folder_paths"] = copy.deepcopy(active_library.get("extra_folder_paths", {}))
+        self.settings["extra_folder_paths"] = copy.deepcopy(
+            active_library.get("extra_folder_paths", {})
+        )
         self.settings["default_lora_root"] = active_library.get("default_lora_root", "")
-        self.settings["default_checkpoint_root"] = active_library.get("default_checkpoint_root", "")
+        self.settings["default_checkpoint_root"] = active_library.get(
+            "default_checkpoint_root", ""
+        )
         self.settings["default_unet_root"] = active_library.get("default_unet_root", "")
-        self.settings["default_embedding_root"] = active_library.get("default_embedding_root", "")
+        self.settings["default_embedding_root"] = active_library.get(
+            "default_embedding_root", ""
+        )
 
         if save:
             self._save_settings()
@@ -468,7 +498,9 @@ class SettingsManager:
             payload.setdefault("folder_paths", {})
 
         if extra_folder_paths is not None:
-            payload["extra_folder_paths"] = self._normalize_folder_paths(extra_folder_paths)
+            payload["extra_folder_paths"] = self._normalize_folder_paths(
+                extra_folder_paths
+            )
         else:
             payload.setdefault("extra_folder_paths", {})
 
@@ -577,7 +609,9 @@ class SettingsManager:
                 }
                 overlap = existing.intersection(new_paths.keys())
                 if overlap:
-                    collisions = ", ".join(sorted(new_paths[value] for value in overlap))
+                    collisions = ", ".join(
+                        sorted(new_paths[value] for value in overlap)
+                    )
                     raise ValueError(
                         f"Folder path(s) {collisions} already assigned to library '{other_name}'"
                     )
@@ -612,19 +646,31 @@ class SettingsManager:
                 library["extra_folder_paths"] = normalized_extra_paths
                 changed = True
 
-        if default_lora_root is not None and library.get("default_lora_root") != default_lora_root:
+        if (
+            default_lora_root is not None
+            and library.get("default_lora_root") != default_lora_root
+        ):
             library["default_lora_root"] = default_lora_root
             changed = True
 
-        if default_checkpoint_root is not None and library.get("default_checkpoint_root") != default_checkpoint_root:
+        if (
+            default_checkpoint_root is not None
+            and library.get("default_checkpoint_root") != default_checkpoint_root
+        ):
             library["default_checkpoint_root"] = default_checkpoint_root
             changed = True
 
-        if default_unet_root is not None and library.get("default_unet_root") != default_unet_root:
+        if (
+            default_unet_root is not None
+            and library.get("default_unet_root") != default_unet_root
+        ):
             library["default_unet_root"] = default_unet_root
             changed = True
 
-        if default_embedding_root is not None and library.get("default_embedding_root") != default_embedding_root:
+        if (
+            default_embedding_root is not None
+            and library.get("default_embedding_root") != default_embedding_root
+        ):
             library["default_embedding_root"] = default_embedding_root
             changed = True
 
@@ -637,16 +683,16 @@ class SettingsManager:
     def _migrate_setting_keys(self) -> None:
         """Migrate legacy camelCase setting keys to snake_case"""
         key_migrations = {
-            'optimizeExampleImages': 'optimize_example_images',
+            "optimizeExampleImages": "optimize_example_images",
-            'autoDownloadExampleImages': 'auto_download_example_images',
+            "autoDownloadExampleImages": "auto_download_example_images",
-            'blurMatureContent': 'blur_mature_content',
+            "blurMatureContent": "blur_mature_content",
-            'matureBlurLevel': 'mature_blur_level',
+            "matureBlurLevel": "mature_blur_level",
-            'autoplayOnHover': 'autoplay_on_hover',
+            "autoplayOnHover": "autoplay_on_hover",
-            'displayDensity': 'display_density',
+            "displayDensity": "display_density",
-            'cardInfoDisplay': 'card_info_display',
+            "cardInfoDisplay": "card_info_display",
-            'includeTriggerWords': 'include_trigger_words',
+            "includeTriggerWords": "include_trigger_words",
-            'compactMode': 'compact_mode',
+            "compactMode": "compact_mode",
-            'modelCardFooterAction': 'model_card_footer_action',
+            "modelCardFooterAction": "model_card_footer_action",
         }
 
         updated = False
@@ -663,65 +709,77 @@ class SettingsManager:
 
     def _migrate_download_path_template(self):
         """Migrate old download_path_template to new download_path_templates"""
-        old_template = self.settings.get('download_path_template')
+        old_template = self.settings.get("download_path_template")
-        templates = self.settings.get('download_path_templates')
+        templates = self.settings.get("download_path_templates")
 
         # If old template exists and new templates don't exist, migrate
         if old_template is not None and not templates:
             logger.info("Migrating download_path_template to download_path_templates")
-            self.settings['download_path_templates'] = {
+            self.settings["download_path_templates"] = {
-                'lora': old_template,
+                "lora": old_template,
-                'checkpoint': old_template,
+                "checkpoint": old_template,
-                'embedding': old_template
+                "embedding": old_template,
             }
             # Remove old setting
-            del self.settings['download_path_template']
+            del self.settings["download_path_template"]
             self._save_settings()
             logger.info("Migration completed")
 
     def _auto_set_default_roots(self):
-        """Auto set default root paths when the current default is unset or not among the options.
+        """Ensure default root paths always point at a current valid root.
 
-        For single-path cases, always use that path.
+        Empty or stale defaults are repaired to the first configured root.
-        For multi-path cases, only set if current default is empty or invalid.
+        Skips auto-setting when the settings file matches the template
+        (user hasn't customized yet).
         """
-        folder_paths = self.settings.get('folder_paths', {})
+        # Skip auto-setting if the user hasn't customized settings yet (template preserved)
+        if self._preserve_disk_template:
+            return
+
+        folder_paths = self.settings.get("folder_paths", {})
         updated = False
-        # loras
+
-        loras = folder_paths.get('loras', [])
+        def _check_and_auto_set(key: str, setting_key: str) -> bool:
-        if isinstance(loras, list) and len(loras) == 1:
+            """Repair default roots when empty or no longer present."""
-            current_lora_root = self.settings.get('default_lora_root')
+            current = self.settings.get(setting_key, "")
-            if current_lora_root not in loras:
+            candidates = folder_paths.get(key, [])
-                self.settings['default_lora_root'] = loras[0]
+            if not isinstance(candidates, list) or not candidates:
-                updated = True
+                return False
-        # checkpoints
+
-        checkpoints = folder_paths.get('checkpoints', [])
+            # Filter valid path strings
-        if isinstance(checkpoints, list) and len(checkpoints) == 1:
+            valid_paths = [p for p in candidates if isinstance(p, str) and p.strip()]
-            current_checkpoint_root = self.settings.get('default_checkpoint_root')
+            if not valid_paths:
-            if current_checkpoint_root not in checkpoints:
+                return False
-                self.settings['default_checkpoint_root'] = checkpoints[0]
+
-                updated = True
+            if current in valid_paths:
-        # unet (diffusion models) - auto-set if empty or invalid
+                return False
-        unet_paths = folder_paths.get('unet', [])
+
-        if isinstance(unet_paths, list) and len(unet_paths) >= 1:
+            self.settings[setting_key] = valid_paths[0]
-            current_unet_root = self.settings.get('default_unet_root')
+            if current:
-            # Set to first path if current is empty or not in the valid paths
+                logger.info(
-            if not current_unet_root or current_unet_root not in unet_paths:
+                    "Repaired stale %s from '%s' to '%s'",
-                self.settings['default_unet_root'] = unet_paths[0]
+                    setting_key,
-                updated = True
+                    current,
-        # embeddings
+                    valid_paths[0],
-        embeddings = folder_paths.get('embeddings', [])
+                )
-        if isinstance(embeddings, list) and len(embeddings) == 1:
+            else:
-            current_embedding_root = self.settings.get('default_embedding_root')
+                logger.info("Auto-set %s to '%s'", setting_key, valid_paths[0])
-            if current_embedding_root not in embeddings:
+            return True
-                self.settings['default_embedding_root'] = embeddings[0]
+
-                updated = True
+        # Process all model types
+        updated = _check_and_auto_set("loras", "default_lora_root") or updated
+        updated = (
+            _check_and_auto_set("checkpoints", "default_checkpoint_root") or updated
+        )
+        updated = _check_and_auto_set("unet", "default_unet_root") or updated
+        updated = _check_and_auto_set("embeddings", "default_embedding_root") or updated
+
         if updated:
             self._update_active_library_entry(
-                default_lora_root=self.settings.get('default_lora_root'),
+                default_lora_root=self.settings.get("default_lora_root"),
-                default_checkpoint_root=self.settings.get('default_checkpoint_root'),
+                default_checkpoint_root=self.settings.get("default_checkpoint_root"),
-                default_unet_root=self.settings.get('default_unet_root'),
+                default_unet_root=self.settings.get("default_unet_root"),
-                default_embedding_root=self.settings.get('default_embedding_root'),
+                default_embedding_root=self.settings.get("default_embedding_root"),
             )
             if self._bootstrap_reason == "missing":
                 self._needs_initial_save = True
@@ -730,11 +788,11 @@ class SettingsManager:
 
     def _check_environment_variables(self) -> None:
         """Check for environment variables and update settings if needed"""
-        env_api_key = os.environ.get('CIVITAI_API_KEY')
+        env_api_key = os.environ.get("CIVITAI_API_KEY")
         if env_api_key:  # Check if the environment variable exists and is not empty
             logger.info("Found CIVITAI_API_KEY environment variable")
             # Always use the environment variable if it exists
-            self.settings['civitai_api_key'] = env_api_key
+            self.settings["civitai_api_key"] = env_api_key
             self._save_settings()
 
     def _default_settings_actions(self) -> List[Dict[str, Any]]:
@@ -799,7 +857,9 @@ class SettingsManager:
             disk_value = self._original_disk_payload.get(key)
             default_value = defaults.get(key)
             # Compare using JSON serialization for complex objects
-            if json.dumps(disk_value, sort_keys=True, default=str) == json.dumps(default_value, sort_keys=True, default=str):
+            if json.dumps(disk_value, sort_keys=True, default=str) == json.dumps(
+                default_value, sort_keys=True, default=str
+            ):
                 default_value_keys.add(key)
 
         # Only cleanup if there are "many" default keys (indicating a bloated file)
@@ -807,7 +867,7 @@ class SettingsManager:
         if len(default_value_keys) >= DEFAULT_KEYS_CLEANUP_THRESHOLD:
             logger.info(
                 "Cleaning up %d default value(s) from settings.json to keep it minimal",
-                len(default_value_keys)
+                len(default_value_keys),
             )
             self._save_settings()
             # Update original payload to match what we just saved
@@ -817,8 +877,8 @@ class SettingsManager:
         if not self._standalone_mode:
             return
 
-        folder_paths = self.settings.get('folder_paths', {}) or {}
+        folder_paths = self.settings.get("folder_paths", {}) or {}
-        monitored_keys = ('loras', 'checkpoints', 'embeddings')
+        monitored_keys = ("loras", "checkpoints", "embeddings")
 
         has_valid_paths = False
         for key in monitored_keys:
@@ -829,7 +889,10 @@ class SettingsManager:
                 iterator = list(raw_paths)
             except TypeError:
                 continue
-            if any(isinstance(path, str) and path and os.path.exists(path) for path in iterator):
+            if any(
+                isinstance(path, str) and path and os.path.exists(path)
+                for path in iterator
+            ):
                 has_valid_paths = True
                 break
 
@@ -860,13 +923,13 @@ class SettingsManager:
     def _get_default_settings(self) -> Dict[str, Any]:
         """Return default settings"""
         defaults = copy.deepcopy(DEFAULT_SETTINGS)
-        defaults['base_model_path_mappings'] = {}
+        defaults["base_model_path_mappings"] = {}
-        defaults['download_path_templates'] = {}
+        defaults["download_path_templates"] = {}
-        defaults['priority_tags'] = DEFAULT_PRIORITY_TAG_CONFIG.copy()
+        defaults["priority_tags"] = DEFAULT_PRIORITY_TAG_CONFIG.copy()
-        defaults.setdefault('folder_paths', {})
+        defaults.setdefault("folder_paths", {})
-        defaults.setdefault('extra_folder_paths', {})
+        defaults.setdefault("extra_folder_paths", {})
-        defaults['auto_organize_exclusions'] = []
+        defaults["auto_organize_exclusions"] = []
-        defaults['metadata_refresh_skip_paths'] = []
+        defaults["metadata_refresh_skip_paths"] = []
 
         library_name = defaults.get("active_library") or "default"
         default_library = self._build_library_payload(
@@ -876,8 +939,8 @@ class SettingsManager:
             default_checkpoint_root=defaults.get("default_checkpoint_root"),
             default_embedding_root=defaults.get("default_embedding_root"),
         )
-        defaults['libraries'] = {library_name: default_library}
+        defaults["libraries"] = {library_name: default_library}
-        defaults['active_library'] = library_name
+        defaults["active_library"] = library_name
         return defaults
 
     def _normalize_priority_tag_config(self, value: Any) -> Dict[str, str]:
@@ -908,7 +971,9 @@ class SettingsManager:
             candidates: Iterable[str] = (
                 value.replace("\n", ",").replace(";", ",").split(",")
             )
-        elif isinstance(value, Sequence) and not isinstance(value, (bytes, bytearray, str)):
+        elif isinstance(value, Sequence) and not isinstance(
+            value, (bytes, bytearray, str)
+        ):
             candidates = value
         else:
             return []
@@ -954,7 +1019,9 @@ class SettingsManager:
             candidates: Iterable[str] = (
                 value.replace("\n", ",").replace(";", ",").split(",")
             )
-        elif isinstance(value, Sequence) and not isinstance(value, (bytes, bytearray, str)):
+        elif isinstance(value, Sequence) and not isinstance(
+            value, (bytes, bytearray, str)
+        ):
             candidates = value
         else:
             return []
@@ -1060,7 +1127,9 @@ class SettingsManager:
                 continue
             normalized = os.path.normcase(os.path.normpath(stripped))
             if os.path.exists(stripped):
-                normalized = os.path.normcase(os.path.normpath(os.path.realpath(stripped)))
+                normalized = os.path.normcase(
+                    os.path.normpath(os.path.realpath(stripped))
+                )
             primary_real_paths.add(normalized)
 
         primary_symlink_targets = set()
@@ -1096,8 +1165,13 @@ class SettingsManager:
                 continue
             normalized = os.path.normcase(os.path.normpath(stripped))
             if os.path.exists(stripped):
-                normalized = os.path.normcase(os.path.normpath(os.path.realpath(stripped)))
+                normalized = os.path.normcase(
-            if normalized in primary_real_paths or normalized in primary_symlink_targets:
+                    os.path.normpath(os.path.realpath(stripped))
+                )
+            if (
+                normalized in primary_real_paths
+                or normalized in primary_symlink_targets
+            ):
                 overlapping_paths.append(stripped)
 
         if overlapping_paths:
@@ -1161,19 +1235,19 @@ class SettingsManager:
         if key == "use_portable_settings" and isinstance(value, bool):
             portable_switch_pending = True
             self._prepare_portable_switch(value)
-        if key == 'folder_paths' and isinstance(value, Mapping):
+        if key == "folder_paths" and isinstance(value, Mapping):
             self._update_active_library_entry(folder_paths=value)  # type: ignore[arg-type]
-        elif key == 'extra_folder_paths' and isinstance(value, Mapping):
+        elif key == "extra_folder_paths" and isinstance(value, Mapping):
             self._update_active_library_entry(extra_folder_paths=value)  # type: ignore[arg-type]
-        elif key == 'default_lora_root':
+        elif key == "default_lora_root":
             self._update_active_library_entry(default_lora_root=str(value))
-        elif key == 'default_checkpoint_root':
+        elif key == "default_checkpoint_root":
             self._update_active_library_entry(default_checkpoint_root=str(value))
-        elif key == 'default_unet_root':
+        elif key == "default_unet_root":
             self._update_active_library_entry(default_unet_root=str(value))
-        elif key == 'default_embedding_root':
+        elif key == "default_embedding_root":
             self._update_active_library_entry(default_embedding_root=str(value))
-        elif key == 'model_name_display':
+        elif key == "model_name_display":
             self._notify_model_name_display_change(value)
         self._save_settings()
         if portable_switch_pending:
@@ -1249,10 +1323,9 @@ class SettingsManager:
 
         source_cache_dir = os.path.join(source_dir, "model_cache")
         target_cache_dir = os.path.join(target_dir, "model_cache")
-        if (
+        if os.path.isdir(source_cache_dir) and os.path.abspath(
-            os.path.isdir(source_cache_dir)
+            source_cache_dir
-            and os.path.abspath(source_cache_dir) != os.path.abspath(target_cache_dir)
+        ) != os.path.abspath(target_cache_dir):
-        ):
             try:
                 shutil.copytree(
                     source_cache_dir,
@@ -1270,10 +1343,9 @@ class SettingsManager:
 
         source_cache_file = os.path.join(source_dir, "model_cache.sqlite")
         target_cache_file = os.path.join(target_dir, "model_cache.sqlite")
-        if (
+        if os.path.isfile(source_cache_file) and os.path.abspath(
-            os.path.isfile(source_cache_file)
+            source_cache_file
-            and os.path.abspath(source_cache_file) != os.path.abspath(target_cache_file)
+        ) != os.path.abspath(target_cache_file):
-        ):
             try:
                 shutil.copy2(source_cache_file, target_cache_file)
             except Exception as exc:
@@ -1299,7 +1371,9 @@ class SettingsManager:
         try:
             os.makedirs(config_dir, exist_ok=True)
         except Exception as exc:
-            logger.warning("Failed to create user config directory %s: %s", config_dir, exc)
+            logger.warning(
+                "Failed to create user config directory %s: %s", config_dir, exc
+            )
 
         return config_dir
 
@@ -1359,7 +1433,9 @@ class SettingsManager:
                 try:
                     asyncio.run(coroutine)
                 except RuntimeError:
-                    logger.debug("Skipping name display update due to missing event loop")
+                    logger.debug(
+                        "Skipping name display update due to missing event loop"
+                    )
                 continue
 
             if loop is not None and target_loop is loop:
@@ -1382,7 +1458,7 @@ class SettingsManager:
         """Save settings to file"""
         try:
             payload = self._serialize_settings_for_disk()
-            with open(self.settings_file, 'w', encoding='utf-8') as f:
+            with open(self.settings_file, "w", encoding="utf-8") as f:
                 json.dump(payload, f, indent=2)
         except Exception as e:
             logger.error(f"Error saving settings: {e}")
@@ -1423,7 +1499,9 @@ class SettingsManager:
                 minimal[key] = copy.deepcopy(value)
             # Complex objects need deep comparison
             elif isinstance(value, (dict, list)) and default_value is not None:
-                if json.dumps(value, sort_keys=True, default=str) != json.dumps(default_value, sort_keys=True, default=str):
+                if json.dumps(value, sort_keys=True, default=str) != json.dumps(
+                    default_value, sort_keys=True, default=str
+                ):
                     minimal[key] = copy.deepcopy(value)
             # Simple values use direct comparison
             elif value != default_value:
@@ -1500,9 +1578,15 @@ class SettingsManager:
         existing = libraries.get(name, {})
 
         payload = self._build_library_payload(
-            folder_paths=folder_paths if folder_paths is not None else existing.get("folder_paths"),
+            folder_paths=folder_paths
-            extra_folder_paths=extra_folder_paths if extra_folder_paths is not None else existing.get("extra_folder_paths"),
+            if folder_paths is not None
-            default_lora_root=default_lora_root if default_lora_root is not None else existing.get("default_lora_root"),
+            else existing.get("folder_paths"),
+            extra_folder_paths=extra_folder_paths
+            if extra_folder_paths is not None
+            else existing.get("extra_folder_paths"),
+            default_lora_root=default_lora_root
+            if default_lora_root is not None
+            else existing.get("default_lora_root"),
             default_checkpoint_root=(
                 default_checkpoint_root
                 if default_checkpoint_root is not None
@@ -1662,7 +1746,9 @@ class SettingsManager:
                 if service and hasattr(service, "on_library_changed"):
                     try:
                         service.on_library_changed()
-                    except Exception as service_exc:  # pragma: no cover - defensive logging
+                    except (
+                        Exception
+                    ) as service_exc:  # pragma: no cover - defensive logging
                         logger.debug(
                             "Service %s failed to handle library change: %s",
                             service_name,
@@ -1680,7 +1766,7 @@ class SettingsManager:
         Returns:
             Template string for the model type, defaults to '{base_model}/{first_tag}'
         """
-        templates = self.settings.get('download_path_templates', {})
+        templates = self.settings.get("download_path_templates", {})
 
         # Handle edge case where templates might be stored as JSON string
         if isinstance(templates, str):
@@ -1689,36 +1775,40 @@ class SettingsManager:
                 parsed_templates = json.loads(templates)
                 if isinstance(parsed_templates, dict):
                     # Update settings with parsed dictionary
-                    self.settings['download_path_templates'] = parsed_templates
+                    self.settings["download_path_templates"] = parsed_templates
                     self._save_settings()
                     templates = parsed_templates
-                    logger.info("Successfully parsed download_path_templates from JSON string")
+                    logger.info(
+                        "Successfully parsed download_path_templates from JSON string"
+                    )
                 else:
                     raise ValueError("Parsed JSON is not a dictionary")
             except (json.JSONDecodeError, ValueError) as e:
                 # If parsing fails, set default values
-                logger.warning(f"Failed to parse download_path_templates JSON string: {e}. Setting default values.")
+                logger.warning(
-                default_template = '{base_model}/{first_tag}'
+                    f"Failed to parse download_path_templates JSON string: {e}. Setting default values."
+                )
+                default_template = "{base_model}/{first_tag}"
                 templates = {
-                    'lora': default_template,
+                    "lora": default_template,
-                    'checkpoint': default_template,
+                    "checkpoint": default_template,
-                    'embedding': default_template
+                    "embedding": default_template,
                 }
-                self.settings['download_path_templates'] = templates
+                self.settings["download_path_templates"] = templates
                 self._save_settings()
 
         # Ensure templates is a dictionary
         if not isinstance(templates, dict):
-            default_template = '{base_model}/{first_tag}'
+            default_template = "{base_model}/{first_tag}"
             templates = {
-                'lora': default_template,
+                "lora": default_template,
-                'checkpoint': default_template,
+                "checkpoint": default_template,
-                'embedding': default_template
+                "embedding": default_template,
             }
-            self.settings['download_path_templates'] = templates
+            self.settings["download_path_templates"] = templates
             self._save_settings()
 
-        return templates.get(model_type, '{base_model}/{first_tag}')
+        return templates.get(model_type, "{base_model}/{first_tag}")
 
 
 _SETTINGS_MANAGER: Optional["SettingsManager"] = None

static/js/managers/SettingsManager.js

@@ -1246,10 +1246,7 @@ export class SettingsManager {
                 throw new Error('No LoRA roots found');
             }
 
-            // Clear existing options except the first one (No Default)
-            const noDefaultOption = defaultLoraRootSelect.querySelector('option[value=""]');
             defaultLoraRootSelect.innerHTML = '';
-            defaultLoraRootSelect.appendChild(noDefaultOption);
 
             // Add options for each root
             data.roots.forEach(root => {
@@ -1259,9 +1256,8 @@ export class SettingsManager {
                 defaultLoraRootSelect.appendChild(option);
             });
 
-            // Set selected value from settings
             const defaultRoot = state.global.settings.default_lora_root || '';
-            defaultLoraRootSelect.value = defaultRoot;
+            defaultLoraRootSelect.value = data.roots.includes(defaultRoot) ? defaultRoot : data.roots[0];
 
         } catch (error) {
             console.error('Error loading LoRA roots:', error);
@@ -1285,10 +1281,7 @@ export class SettingsManager {
                 throw new Error('No checkpoint roots found');
             }
 
-            // Clear existing options except first one (No Default)
-            const noDefaultOption = defaultCheckpointRootSelect.querySelector('option[value=""]');
             defaultCheckpointRootSelect.innerHTML = '';
-            defaultCheckpointRootSelect.appendChild(noDefaultOption);
 
             // Add options for each root
             data.roots.forEach(root => {
@@ -1298,9 +1291,8 @@ export class SettingsManager {
                 defaultCheckpointRootSelect.appendChild(option);
             });
 
-            // Set selected value from settings
             const defaultRoot = state.global.settings.default_checkpoint_root || '';
-            defaultCheckpointRootSelect.value = defaultRoot;
+            defaultCheckpointRootSelect.value = data.roots.includes(defaultRoot) ? defaultRoot : data.roots[0];
 
         } catch (error) {
             console.error('Error loading checkpoint roots:', error);
@@ -1324,10 +1316,7 @@ export class SettingsManager {
                 throw new Error('No diffusion model roots found');
             }
 
-            // Clear existing options except first one (No Default)
-            const noDefaultOption = defaultUnetRootSelect.querySelector('option[value=""]');
             defaultUnetRootSelect.innerHTML = '';
-            defaultUnetRootSelect.appendChild(noDefaultOption);
 
             // Add options for each root
             data.roots.forEach(root => {
@@ -1337,9 +1326,8 @@ export class SettingsManager {
                 defaultUnetRootSelect.appendChild(option);
             });
 
-            // Set selected value from settings
             const defaultRoot = state.global.settings.default_unet_root || '';
-            defaultUnetRootSelect.value = defaultRoot;
+            defaultUnetRootSelect.value = data.roots.includes(defaultRoot) ? defaultRoot : data.roots[0];
 
         } catch (error) {
             console.error('Error loading diffusion model roots:', error);
@@ -1363,10 +1351,7 @@ export class SettingsManager {
                 throw new Error('No embedding roots found');
             }
 
-            // Clear existing options except first one (No Default)
-            const noDefaultOption = defaultEmbeddingRootSelect.querySelector('option[value=""]');
             defaultEmbeddingRootSelect.innerHTML = '';
-            defaultEmbeddingRootSelect.appendChild(noDefaultOption);
 
             // Add options for each root
             data.roots.forEach(root => {
@@ -1376,9 +1361,8 @@ export class SettingsManager {
                 defaultEmbeddingRootSelect.appendChild(option);
             });
 
-            // Set selected value from settings
             const defaultRoot = state.global.settings.default_embedding_root || '';
-            defaultEmbeddingRootSelect.value = defaultRoot;
+            defaultEmbeddingRootSelect.value = data.roots.includes(defaultRoot) ? defaultRoot : data.roots[0];
 
         } catch (error) {
             console.error('Error loading embedding roots:', error);

templates/components/modals/settings_modal.html

@@ -484,9 +484,7 @@
                                     </label>
                                     </div>
                                     <div class="setting-control select-control">
-                                        <select id="defaultLoraRoot" onchange="settingsManager.saveSelectSetting('defaultLoraRoot', 'default_lora_root')">
+                                        <select id="defaultLoraRoot" onchange="settingsManager.saveSelectSetting('defaultLoraRoot', 'default_lora_root')"></select>
-                                            <option value="">{{ t('settings.folderSettings.noDefault') }}</option>
-                                        </select>
                                     </div>
                                 </div>
                             </div>
@@ -500,9 +498,7 @@
                                     </label>
                                     </div>
                                     <div class="setting-control select-control">
-                                        <select id="defaultCheckpointRoot" onchange="settingsManager.saveSelectSetting('defaultCheckpointRoot', 'default_checkpoint_root')">
+                                        <select id="defaultCheckpointRoot" onchange="settingsManager.saveSelectSetting('defaultCheckpointRoot', 'default_checkpoint_root')"></select>
-                                            <option value="">{{ t('settings.folderSettings.noDefault') }}</option>
-                                        </select>
                                     </div>
                                 </div>
                             </div>
@@ -516,9 +512,7 @@
                                     </label>
                                     </div>
                                     <div class="setting-control select-control">
-                                        <select id="defaultUnetRoot" onchange="settingsManager.saveSelectSetting('defaultUnetRoot', 'default_unet_root')">
+                                        <select id="defaultUnetRoot" onchange="settingsManager.saveSelectSetting('defaultUnetRoot', 'default_unet_root')"></select>
-                                            <option value="">{{ t('settings.folderSettings.noDefault') }}</option>
-                                        </select>
                                     </div>
                                 </div>
                             </div>
@@ -532,9 +526,7 @@
                                     </label>
                                     </div>
                                     <div class="setting-control select-control">
-                                        <select id="defaultEmbeddingRoot" onchange="settingsManager.saveSelectSetting('defaultEmbeddingRoot', 'default_embedding_root')">
+                                        <select id="defaultEmbeddingRoot" onchange="settingsManager.saveSelectSetting('defaultEmbeddingRoot', 'default_embedding_root')"></select>
-                                            <option value="">{{ t('settings.folderSettings.noDefault') }}</option>
-                                        </select>
                                     </div>
                                 </div>
                             </div>

tests/config/test_config_save_paths.py

@@ -131,6 +131,102 @@ def test_save_paths_logs_warning_when_upsert_fails(
     assert "Failed to save folder paths: boom" in caplog.text
 
 
+def test_save_paths_repairs_empty_default_roots(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    folder_paths = _setup_config_environment(monkeypatch, tmp_path)
+
+    class FakeSettingsService:
+        def get_libraries(self):
+            return {
+                "comfyui": {
+                    "folder_paths": {key: list(value) for key, value in folder_paths.items()},
+                    "default_lora_root": "",
+                    "default_checkpoint_root": "",
+                    "default_embedding_root": "",
+                }
+            }
+
+        def rename_library(self, *_):
+            raise AssertionError("rename_library should not be invoked")
+
+        def upsert_library(self, name: str, **payload):
+            self.name = name
+            self.payload = payload
+
+    fake_settings = FakeSettingsService()
+    monkeypatch.setattr(settings_manager_module, "settings", fake_settings)
+
+    config_module.Config()
+
+    assert fake_settings.name == "comfyui"
+    assert fake_settings.payload["default_lora_root"] == folder_paths["loras"][0].replace("\\", "/")
+    assert fake_settings.payload["default_checkpoint_root"] == folder_paths["checkpoints"][0].replace("\\", "/")
+    assert fake_settings.payload["default_embedding_root"] == folder_paths["embeddings"][0].replace("\\", "/")
+
+
+def test_save_paths_repairs_stale_default_roots(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    folder_paths = _setup_config_environment(monkeypatch, tmp_path)
+
+    class FakeSettingsService:
+        def get_libraries(self):
+            return {
+                "comfyui": {
+                    "folder_paths": {key: list(value) for key, value in folder_paths.items()},
+                    "default_lora_root": "/stale/loras",
+                    "default_checkpoint_root": "/stale/checkpoints",
+                    "default_embedding_root": "/stale/embeddings",
+                }
+            }
+
+        def rename_library(self, *_):
+            raise AssertionError("rename_library should not be invoked")
+
+        def upsert_library(self, name: str, **payload):
+            self.name = name
+            self.payload = payload
+
+    fake_settings = FakeSettingsService()
+    monkeypatch.setattr(settings_manager_module, "settings", fake_settings)
+
+    config_module.Config()
+
+    assert fake_settings.name == "comfyui"
+    assert fake_settings.payload["default_lora_root"] == folder_paths["loras"][0].replace("\\", "/")
+    assert fake_settings.payload["default_checkpoint_root"] == folder_paths["checkpoints"][0].replace("\\", "/")
+    assert fake_settings.payload["default_embedding_root"] == folder_paths["embeddings"][0].replace("\\", "/")
+
+
+def test_save_paths_keeps_valid_default_roots(monkeypatch: pytest.MonkeyPatch, tmp_path):
+    folder_paths = _setup_config_environment(monkeypatch, tmp_path)
+
+    class FakeSettingsService:
+        def get_libraries(self):
+            return {
+                "comfyui": {
+                    "folder_paths": {key: list(value) for key, value in folder_paths.items()},
+                    "default_lora_root": folder_paths["loras"][0],
+                    "default_checkpoint_root": folder_paths["checkpoints"][0],
+                    "default_embedding_root": folder_paths["embeddings"][0],
+                }
+            }
+
+        def rename_library(self, *_):
+            raise AssertionError("rename_library should not be invoked")
+
+        def upsert_library(self, name: str, **payload):
+            self.name = name
+            self.payload = payload
+
+    fake_settings = FakeSettingsService()
+    monkeypatch.setattr(settings_manager_module, "settings", fake_settings)
+
+    config_module.Config()
+
+    assert fake_settings.name == "comfyui"
+    assert fake_settings.payload["default_lora_root"] == folder_paths["loras"][0].replace("\\", "/")
+    assert fake_settings.payload["default_checkpoint_root"] == folder_paths["checkpoints"][0].replace("\\", "/")
+    assert fake_settings.payload["default_embedding_root"] == folder_paths["embeddings"][0].replace("\\", "/")
+
+
 def test_save_paths_removes_template_default_library(monkeypatch, tmp_path):
     folder_paths = _setup_config_environment(monkeypatch, tmp_path)
 

tests/services/test_settings_manager.py

@@ -17,7 +17,9 @@ def test_portable_settings_use_project_root(tmp_path, monkeypatch):
     from importlib import reload
 
     settings_paths_module = reload(settings_paths)
-    monkeypatch.setattr(settings_paths_module, "get_project_root", lambda: str(tmp_path))
+    monkeypatch.setattr(
+        settings_paths_module, "get_project_root", lambda: str(tmp_path)
+    )
     monkeypatch.setattr(
         settings_paths_module,
         "user_config_dir",
@@ -25,7 +27,9 @@ def test_portable_settings_use_project_root(tmp_path, monkeypatch):
     )
 
     portable_settings = {"use_portable_settings": True}
-    (tmp_path / "settings.json").write_text(json.dumps(portable_settings), encoding="utf-8")
+    (tmp_path / "settings.json").write_text(
+        json.dumps(portable_settings), encoding="utf-8"
+    )
 
     config_dir = settings_paths_module.get_settings_dir(create=True)
     assert config_dir == str(tmp_path)
@@ -74,7 +78,9 @@ def test_initial_save_persists_minimal_template(tmp_path, monkeypatch):
         self._seed_template = copy.deepcopy(template)
         return copy.deepcopy(template)
 
-    monkeypatch.setattr(SettingsManager, "_load_settings_template", fake_template_loader)
+    monkeypatch.setattr(
+        SettingsManager, "_load_settings_template", fake_template_loader
+    )
 
     manager = SettingsManager()
 
@@ -118,7 +124,10 @@ def test_existing_folder_paths_seed_default_library(tmp_path, monkeypatch):
     assert "default" in libraries
     assert libraries["default"]["folder_paths"]["loras"] == [str(lora_dir)]
     assert libraries["default"]["folder_paths"]["checkpoints"] == [str(checkpoint_dir)]
-    assert libraries["default"]["folder_paths"]["unet"] == [str(diffusion_dir), str(unet_dir)]
+    assert libraries["default"]["folder_paths"]["unet"] == [
+        str(diffusion_dir),
+        str(unet_dir),
+    ]
     assert libraries["default"]["folder_paths"]["embeddings"] == [str(embedding_dir)]
 
     assert manager.get_startup_messages() == []
@@ -138,7 +147,9 @@ def test_environment_variable_overrides_settings(tmp_path, monkeypatch):
     assert mgr.get("civitai_api_key") == "secret"
 
 
-def _create_manager_with_settings(tmp_path, monkeypatch, initial_settings, *, save_spy=None):
+def _create_manager_with_settings(
+    tmp_path, monkeypatch, initial_settings, *, save_spy=None
+):
     """Helper to instantiate SettingsManager with predefined settings."""
 
     fake_settings_path = tmp_path / "settings.json"
@@ -203,7 +214,9 @@ def test_switch_to_portable_mode_copies_cache(tmp_path, monkeypatch):
     assert manager.settings_file == str(project_root / "settings.json")
     marker_copy = project_root / "model_cache" / "user_marker.txt"
     assert marker_copy.read_text(encoding="utf-8") == "user_marker.txt"
-    assert (project_root / "model_cache.sqlite").read_text(encoding="utf-8") == "user_db"
+    assert (project_root / "model_cache.sqlite").read_text(
+        encoding="utf-8"
+    ) == "user_db"
     assert user_settings.exists()
 
 
@@ -216,13 +229,17 @@ def test_switching_back_to_user_config_moves_cache(tmp_path, monkeypatch):
 
     project_cache_dir = project_root / "model_cache"
     project_cache_dir.mkdir(exist_ok=True)
-    (project_cache_dir / "project_marker.txt").write_text("project_marker", encoding="utf-8")
+    (project_cache_dir / "project_marker.txt").write_text(
+        "project_marker", encoding="utf-8"
+    )
     (project_root / "model_cache.sqlite").write_text("project_db", encoding="utf-8")
 
     manager.set("use_portable_settings", False)
 
     assert manager.settings_file == str(user_settings)
-    assert (user_dir / "model_cache" / "project_marker.txt").read_text(encoding="utf-8") == "project_marker"
+    assert (user_dir / "model_cache" / "project_marker.txt").read_text(
+        encoding="utf-8"
+    ) == "project_marker"
     assert (user_dir / "model_cache.sqlite").read_text(encoding="utf-8") == "project_db"
 
 
@@ -242,10 +259,19 @@ def test_download_path_template_invalid_json(manager):
     template = manager.get_download_path_template("checkpoint")
 
     assert template == "{base_model}/{first_tag}"
-    assert manager.settings["download_path_templates"]["lora"] == "{base_model}/{first_tag}"
+    assert (
+        manager.settings["download_path_templates"]["lora"]
+        == "{base_model}/{first_tag}"
+    )
 
 
 def test_auto_set_default_roots(manager):
+    # Clear any previously auto-set values to test fresh behavior
+    manager.settings["default_lora_root"] = ""
+    manager.settings["default_checkpoint_root"] = ""
+    manager.settings["default_embedding_root"] = ""
+    manager.settings["default_unet_root"] = ""
+
     manager.settings["folder_paths"] = {
         "loras": ["/loras"],
         "checkpoints": ["/checkpoints"],
@@ -259,6 +285,48 @@ def test_auto_set_default_roots(manager):
     assert manager.get("default_embedding_root") == "/embeddings"
 
 
+def test_auto_set_default_roots_repairs_stale_values(manager):
+    manager.settings["default_lora_root"] = "/stale-lora"
+    manager.settings["default_checkpoint_root"] = "/stale-checkpoint"
+    manager.settings["default_embedding_root"] = "/stale-embedding"
+    manager.settings["default_unet_root"] = "/stale-unet"
+
+    manager.settings["folder_paths"] = {
+        "loras": ["/loras"],
+        "checkpoints": ["/checkpoints"],
+        "unet": ["/unet"],
+        "embeddings": ["/embeddings"],
+    }
+
+    manager._auto_set_default_roots()
+
+    assert manager.get("default_lora_root") == "/loras"
+    assert manager.get("default_checkpoint_root") == "/checkpoints"
+    assert manager.get("default_unet_root") == "/unet"
+    assert manager.get("default_embedding_root") == "/embeddings"
+
+
+def test_auto_set_default_roots_keeps_valid_values(manager):
+    manager.settings["default_lora_root"] = "/loras"
+    manager.settings["default_checkpoint_root"] = "/checkpoints"
+    manager.settings["default_embedding_root"] = "/embeddings"
+    manager.settings["default_unet_root"] = "/unet"
+
+    manager.settings["folder_paths"] = {
+        "loras": ["/loras", "/other-loras"],
+        "checkpoints": ["/checkpoints"],
+        "unet": ["/unet", "/other-unet"],
+        "embeddings": ["/embeddings"],
+    }
+
+    manager._auto_set_default_roots()
+
+    assert manager.get("default_lora_root") == "/loras"
+    assert manager.get("default_checkpoint_root") == "/checkpoints"
+    assert manager.get("default_unet_root") == "/unet"
+    assert manager.get("default_embedding_root") == "/embeddings"
+
+
 def test_delete_setting(manager):
     manager.set("example", 1)
     manager.delete("example")
@@ -293,7 +361,14 @@ def test_invalid_mature_blur_level_is_normalized_to_r(tmp_path, monkeypatch):
 
 def test_model_name_display_setting_notifies_scanners(tmp_path, monkeypatch):
     initial = {
-        "libraries": {"default": {"folder_paths": {}, "default_lora_root": "", "default_checkpoint_root": "", "default_embedding_root": ""}},
+        "libraries": {
+            "default": {
+                "folder_paths": {},
+                "default_lora_root": "",
+                "default_checkpoint_root": "",
+                "default_embedding_root": "",
+            }
+        },
         "active_library": "default",
         "model_name_display": "model_name",
     }
@@ -315,6 +390,7 @@ def test_model_name_display_setting_notifies_scanners(tmp_path, monkeypatch):
 
     dispatched_loops = []
     futures = []
+
     def tracking_run_coroutine_threadsafe(coro, target_loop):
         dispatched_loops.append(target_loop)
         future = Future()
@@ -335,7 +411,9 @@ def test_model_name_display_setting_notifies_scanners(tmp_path, monkeypatch):
         "get_service_sync",
         classmethod(fake_get_service_sync),
     )
-    monkeypatch.setattr(asyncio, "run_coroutine_threadsafe", tracking_run_coroutine_threadsafe)
+    monkeypatch.setattr(
+        asyncio, "run_coroutine_threadsafe", tracking_run_coroutine_threadsafe
+    )
 
     try:
         manager.set("model_name_display", "file_name")
@@ -354,12 +432,14 @@ def test_migrates_legacy_settings_file(tmp_path, monkeypatch):
     legacy_root = tmp_path / "legacy"
     legacy_root.mkdir()
     legacy_file = legacy_root / "settings.json"
-    legacy_file.write_text("{\"value\": 1}", encoding="utf-8")
+    legacy_file.write_text('{"value": 1}', encoding="utf-8")
 
     target_dir = tmp_path / "config"
 
     monkeypatch.setattr(settings_paths, "get_project_root", lambda: str(legacy_root))
-    monkeypatch.setattr(settings_paths, "user_config_dir", lambda *_, **__: str(target_dir))
+    monkeypatch.setattr(
+        settings_paths, "user_config_dir", lambda *_, **__: str(target_dir)
+    )
 
     migrated_path = settings_paths.ensure_settings_file()
 
@@ -380,7 +460,9 @@ def test_uses_portable_settings_file_when_enabled(tmp_path, monkeypatch):
     user_dir = tmp_path / "user"
 
     monkeypatch.setattr(settings_paths, "get_project_root", lambda: str(repo_root))
-    monkeypatch.setattr(settings_paths, "user_config_dir", lambda *_, **__: str(user_dir))
+    monkeypatch.setattr(
+        settings_paths, "user_config_dir", lambda *_, **__: str(user_dir)
+    )
 
     resolved = settings_paths.ensure_settings_file()
 
@@ -393,7 +475,9 @@ def test_migrate_creates_default_library(manager):
     libraries = manager.get_libraries()
     assert "default" in libraries
     assert manager.get_active_library_name() == "default"
-    assert libraries["default"].get("folder_paths", {}) == manager.settings.get("folder_paths", {})
+    assert libraries["default"].get("folder_paths", {}) == manager.settings.get(
+        "folder_paths", {}
+    )
 
 
 def test_migrate_sanitizes_legacy_libraries(tmp_path, monkeypatch):
@@ -464,12 +548,21 @@ def test_refresh_environment_variables_updates_stored_value(tmp_path, monkeypatc
 
     initial = {
         "civitai_api_key": "stale",
-        "libraries": {"default": {"folder_paths": {}, "default_lora_root": "", "default_checkpoint_root": "", "default_embedding_root": ""}},
+        "libraries": {
+            "default": {
+                "folder_paths": {},
+                "default_lora_root": "",
+                "default_checkpoint_root": "",
+                "default_embedding_root": "",
+            }
+        },
         "active_library": "default",
     }
 
     monkeypatch.setenv("CIVITAI_API_KEY", "from-init")
-    manager = _create_manager_with_settings(tmp_path, monkeypatch, initial, save_spy=save_spy)
+    manager = _create_manager_with_settings(
+        tmp_path, monkeypatch, initial, save_spy=save_spy
+    )
 
     assert calls[-1] == "from-init"
 
@@ -590,7 +683,9 @@ def test_extra_paths_validation_no_overlap_with_other_libraries(manager, tmp_pat
         manager.update_extra_folder_paths({"loras": [str(lora_dir1)]})
 
 
-def test_extra_paths_validation_no_overlap_with_active_primary_lora_root(manager, tmp_path):
+def test_extra_paths_validation_no_overlap_with_active_primary_lora_root(
+    manager, tmp_path
+):
     """Test that extra LoRA paths cannot overlap the active library primary LoRA roots."""
     real_lora_dir = tmp_path / "loras_real"
     real_lora_dir.mkdir()
@@ -603,7 +698,9 @@ def test_extra_paths_validation_no_overlap_with_active_primary_lora_root(manager
         activate=True,
     )
 
-    with pytest.raises(ValueError, match="overlap with the active library's primary LoRA roots"):
+    with pytest.raises(
+        ValueError, match="overlap with the active library's primary LoRA roots"
+    ):
         manager.update_extra_folder_paths({"loras": [str(real_lora_dir)]})
 
 
@@ -627,7 +724,10 @@ def test_extra_paths_validation_no_overlap_with_active_primary_lora_root_case_in
     original_normcase = settings_manager_module.os.path.normcase
 
     def fake_exists(path):
-        if isinstance(path, str) and path.lower() in {str(lora_link).lower(), str(real_lora_dir).lower()}:
+        if isinstance(path, str) and path.lower() in {
+            str(lora_link).lower(),
+            str(real_lora_dir).lower(),
+        }:
             return True
         return original_exists(path)
 
@@ -638,13 +738,21 @@ def test_extra_paths_validation_no_overlap_with_active_primary_lora_root_case_in
 
     monkeypatch.setattr(settings_manager_module.os.path, "exists", fake_exists)
     monkeypatch.setattr(settings_manager_module.os.path, "realpath", fake_realpath)
-    monkeypatch.setattr(settings_manager_module.os.path, "normcase", lambda value: original_normcase(value).lower())
+    monkeypatch.setattr(
+        settings_manager_module.os.path,
+        "normcase",
+        lambda value: original_normcase(value).lower(),
+    )
 
-    with pytest.raises(ValueError, match="overlap with the active library's primary LoRA roots"):
+    with pytest.raises(
+        ValueError, match="overlap with the active library's primary LoRA roots"
+    ):
         manager.update_extra_folder_paths({"loras": [str(real_lora_dir).upper()]})
 
 
-def test_extra_paths_validation_allows_missing_non_overlapping_lora_root(manager, tmp_path):
+def test_extra_paths_validation_allows_missing_non_overlapping_lora_root(
+    manager, tmp_path
+):
     """Missing non-overlapping extra LoRA paths should not be rejected."""
     lora_dir = tmp_path / "loras"
     lora_dir.mkdir()
@@ -662,7 +770,9 @@ def test_extra_paths_validation_allows_missing_non_overlapping_lora_root(manager
     assert extra_paths["loras"] == [str(missing_extra)]
 
 
-def test_extra_paths_validation_rejects_primary_root_first_level_symlink_target(manager, tmp_path):
+def test_extra_paths_validation_rejects_primary_root_first_level_symlink_target(
+    manager, tmp_path
+):
     """Extra LoRA paths should be rejected when already reachable via a first-level symlink under the primary root."""
     lora_dir = tmp_path / "loras"
     lora_dir.mkdir()
@@ -677,7 +787,9 @@ def test_extra_paths_validation_rejects_primary_root_first_level_symlink_target(
         activate=True,
     )
 
-    with pytest.raises(ValueError, match="overlap with the active library's primary LoRA roots"):
+    with pytest.raises(
+        ValueError, match="overlap with the active library's primary LoRA roots"
+    ):
         manager.update_extra_folder_paths({"loras": [str(external_dir)]})
 
 
@@ -698,7 +810,6 @@ def test_delete_library_switches_active(manager, tmp_path):
     assert manager.get_active_library_name() == "default"
 
 
-
 def test_download_skip_base_models_are_normalized(manager):
     manager.settings["download_skip_base_models"] = [
         "SDXL 1.0",
@@ -715,9 +826,6 @@ def test_download_skip_base_models_are_normalized(manager):
 
 
 def test_setting_download_skip_base_models_normalizes_string_input(manager):
-    manager.set(
+    manager.set("download_skip_base_models", "SDXL 1.0, Pony; Invalid\nSDXL 1.0")
-        "download_skip_base_models",
-        "SDXL 1.0, Pony; Invalid\nSDXL 1.0"
-    )
 
     assert manager.get("download_skip_base_models") == ["SDXL 1.0", "Pony"]