refactor(routes): limit update endpoints to essentials

py/routes/base_model_routes.py

@@ -2,7 +2,7 @@ from __future__ import annotations
 
 import logging
 from abc import ABC, abstractmethod
-from typing import Callable, Dict, Mapping
+from typing import TYPE_CHECKING, Callable, Dict, Mapping
 
 import jinja2
 from aiohttp import web
@@ -42,8 +42,12 @@ from .handlers.model_handlers import (
     ModelMoveHandler,
     ModelPageView,
     ModelQueryHandler,
+    ModelUpdateHandler,
 )
 
+if TYPE_CHECKING:
+    from ..services.model_update_service import ModelUpdateService
+
 logger = logging.getLogger(__name__)
 
 
@@ -99,10 +103,18 @@ class BaseModelRoutes(ABC):
             ws_manager=self._ws_manager,
             download_manager_factory=ServiceRegistry.get_download_manager,
         )
+        self._model_update_service: ModelUpdateService | None = None
 
         if service is not None:
             self.attach_service(service)
 
+    def set_model_update_service(self, service: "ModelUpdateService") -> None:
+        """Attach the model update tracking service."""
+
+        self._model_update_service = service
+        self._handler_set = None
+        self._handler_mapping = None
+
     def attach_service(self, service) -> None:
         """Attach a model service and rebuild handler dependencies."""
         self.service = service
@@ -127,6 +139,7 @@ class BaseModelRoutes(ABC):
 
     def _create_handler_set(self) -> ModelHandlerSet:
         service = self._ensure_service()
+        update_service = self._ensure_model_update_service()
         page_view = ModelPageView(
             template_env=self.template_env,
             template_name=self.template_name or "",
@@ -186,6 +199,12 @@ class BaseModelRoutes(ABC):
             ws_manager=self._ws_manager,
             logger=logger,
         )
+        updates = ModelUpdateHandler(
+            service=service,
+            update_service=update_service,
+            metadata_provider_selector=get_metadata_provider,
+            logger=logger,
+        )
         return ModelHandlerSet(
             page_view=page_view,
             listing=listing,
@@ -195,6 +214,7 @@ class BaseModelRoutes(ABC):
             civitai=civitai,
             move=move,
             auto_organize=auto_organize,
+            updates=updates,
         )
 
     @property
@@ -273,3 +293,8 @@ class BaseModelRoutes(ABC):
 
         return proxy
 
+    def _ensure_model_update_service(self) -> "ModelUpdateService":
+        if self._model_update_service is None:
+            raise RuntimeError("Model update service has not been attached")
+        return self._model_update_service
+

py/routes/checkpoint_routes.py

@@ -21,7 +21,9 @@ class CheckpointRoutes(BaseModelRoutes):
         """Initialize services from ServiceRegistry"""
         checkpoint_scanner = await ServiceRegistry.get_checkpoint_scanner()
         self.service = CheckpointService(checkpoint_scanner)
-        
+        update_service = await ServiceRegistry.get_model_update_service()
+        self.set_model_update_service(update_service)
+
         # Attach service dependencies
         self.attach_service(self.service)
     

py/routes/embedding_routes.py

@@ -20,7 +20,9 @@ class EmbeddingRoutes(BaseModelRoutes):
         """Initialize services from ServiceRegistry"""
         embedding_scanner = await ServiceRegistry.get_embedding_scanner()
         self.service = EmbeddingService(embedding_scanner)
-        
+        update_service = await ServiceRegistry.get_model_update_service()
+        self.set_model_update_service(update_service)
+
         # Attach service dependencies
         self.attach_service(self.service)
     

py/routes/handlers/model_handlers.py

@@ -29,6 +29,7 @@ from ...services.use_cases import (
 )
 from ...services.websocket_manager import WebSocketManager
 from ...services.websocket_progress_callback import WebSocketProgressCallback
+from ...services.errors import RateLimitError
 from ...utils.file_utils import calculate_sha256
 from ...utils.metadata_manager import MetadataManager
 
@@ -1017,6 +1018,156 @@ class ModelAutoOrganizeHandler:
             return web.json_response({"success": False, "error": str(exc)}, status=500)
 
 
+class ModelUpdateHandler:
+    """Handle update tracking requests."""
+
+    def __init__(
+        self,
+        *,
+        service,
+        update_service,
+        metadata_provider_selector,
+        logger: logging.Logger,
+    ) -> None:
+        self._service = service
+        self._update_service = update_service
+        self._metadata_provider_selector = metadata_provider_selector
+        self._logger = logger
+
+    async def refresh_model_updates(self, request: web.Request) -> web.Response:
+        payload = await self._read_json(request)
+        force_refresh = self._parse_bool(request.query.get("force")) or self._parse_bool(
+            payload.get("force")
+        )
+        provider = await self._get_civitai_provider()
+        if provider is None:
+            return web.json_response(
+                {"success": False, "error": "Civitai provider not available"}, status=503
+            )
+
+        try:
+            records = await self._update_service.refresh_for_model_type(
+                self._service.model_type,
+                self._service.scanner,
+                provider,
+                force_refresh=force_refresh,
+            )
+        except RateLimitError as exc:
+            return web.json_response(
+                {"success": False, "error": str(exc) or "Rate limited"}, status=429
+            )
+        except Exception as exc:  # pragma: no cover - defensive logging
+            self._logger.error("Failed to refresh model updates: %s", exc, exc_info=True)
+            return web.json_response({"success": False, "error": str(exc)}, status=500)
+
+        return web.json_response(
+            {
+                "success": True,
+                "records": [self._serialize_record(record) for record in records.values()],
+            }
+        )
+
+    async def set_model_update_ignore(self, request: web.Request) -> web.Response:
+        payload = await self._read_json(request)
+        model_id = self._normalize_model_id(payload.get("modelId"))
+        if model_id is None:
+            return web.json_response({"success": False, "error": "modelId is required"}, status=400)
+
+        should_ignore = self._parse_bool(payload.get("shouldIgnore"))
+        record = await self._update_service.set_should_ignore(
+            self._service.model_type, model_id, should_ignore
+        )
+        return web.json_response({"success": True, "record": self._serialize_record(record)})
+
+    async def get_model_update_status(self, request: web.Request) -> web.Response:
+        model_id = self._normalize_model_id(request.match_info.get("model_id"))
+        if model_id is None:
+            return web.json_response({"success": False, "error": "model_id must be an integer"}, status=400)
+
+        refresh = self._parse_bool(request.query.get("refresh"))
+        force = self._parse_bool(request.query.get("force"))
+
+        try:
+            record = await self._get_or_refresh_record(model_id, refresh=refresh, force=force)
+        except RateLimitError as exc:
+            return web.json_response(
+                {"success": False, "error": str(exc) or "Rate limited"}, status=429
+            )
+
+        if record is None:
+            return web.json_response(
+                {"success": False, "error": "Model not tracked"}, status=404
+            )
+
+        return web.json_response({"success": True, "record": self._serialize_record(record)})
+
+    async def _get_or_refresh_record(
+        self, model_id: int, *, refresh: bool, force: bool
+    ) -> Optional[object]:
+        record = await self._update_service.get_record(self._service.model_type, model_id)
+        if record and not refresh and not force:
+            return record
+
+        provider = await self._get_civitai_provider()
+        if provider is None:
+            return record
+
+        return await self._update_service.refresh_single_model(
+            self._service.model_type,
+            model_id,
+            self._service.scanner,
+            provider,
+            force_refresh=force or refresh,
+        )
+
+    async def _get_civitai_provider(self):
+        try:
+            return await self._metadata_provider_selector("civitai_api")
+        except Exception as exc:  # pragma: no cover - defensive log
+            self._logger.error("Failed to acquire civitai provider: %s", exc, exc_info=True)
+            return None
+
+    async def _read_json(self, request: web.Request) -> Dict:
+        if not request.can_read_body:
+            return {}
+        try:
+            return await request.json()
+        except Exception:
+            return {}
+
+    @staticmethod
+    def _parse_bool(value) -> bool:
+        if isinstance(value, bool):
+            return value
+        if isinstance(value, str):
+            return value.lower() in {"1", "true", "yes"}
+        if isinstance(value, (int, float)):
+            return bool(value)
+        return False
+
+    @staticmethod
+    def _normalize_model_id(value) -> Optional[int]:
+        try:
+            if value is None:
+                return None
+            return int(value)
+        except (TypeError, ValueError):
+            return None
+
+    @staticmethod
+    def _serialize_record(record) -> Dict:
+        return {
+            "modelType": record.model_type,
+            "modelId": record.model_id,
+            "largestVersionId": record.largest_version_id,
+            "versionIds": record.version_ids,
+            "inLibraryVersionIds": record.in_library_version_ids,
+            "lastCheckedAt": record.last_checked_at,
+            "shouldIgnore": record.should_ignore,
+            "hasUpdate": record.has_update(),
+        }
+
+
 @dataclass
 class ModelHandlerSet:
     """Aggregate concrete handlers into a flat mapping."""
@@ -1029,6 +1180,7 @@ class ModelHandlerSet:
     civitai: ModelCivitaiHandler
     move: ModelMoveHandler
     auto_organize: ModelAutoOrganizeHandler
+    updates: ModelUpdateHandler
 
     def to_route_mapping(self) -> Dict[str, Callable[[web.Request], Awaitable[web.Response]]]:
         return {
@@ -1073,5 +1225,8 @@ class ModelHandlerSet:
             "get_model_metadata": self.query.get_model_metadata,
             "get_model_description": self.query.get_model_description,
             "get_relative_paths": self.query.get_relative_paths,
+            "refresh_model_updates": self.updates.refresh_model_updates,
+            "set_model_update_ignore": self.updates.set_model_update_ignore,
+            "get_model_update_status": self.updates.get_model_update_status,
         }
 

py/routes/lora_routes.py

@@ -24,7 +24,9 @@ class LoraRoutes(BaseModelRoutes):
         """Initialize services from ServiceRegistry"""
         lora_scanner = await ServiceRegistry.get_lora_scanner()
         self.service = LoraService(lora_scanner)
-        
+        update_service = await ServiceRegistry.get_model_update_service()
+        self.set_model_update_service(update_service)
+
         # Attach service dependencies
         self.attach_service(self.service)
     

py/routes/model_route_registrar.py

@@ -55,6 +55,9 @@ COMMON_ROUTE_DEFINITIONS: tuple[RouteDefinition, ...] = (
     RouteDefinition("GET", "/api/lm/{prefix}/civitai/versions/{model_id}", "get_civitai_versions"),
     RouteDefinition("GET", "/api/lm/{prefix}/civitai/model/version/{modelVersionId}", "get_civitai_model_by_version"),
     RouteDefinition("GET", "/api/lm/{prefix}/civitai/model/hash/{hash}", "get_civitai_model_by_hash"),
+    RouteDefinition("POST", "/api/lm/{prefix}/updates/refresh", "refresh_model_updates"),
+    RouteDefinition("POST", "/api/lm/{prefix}/updates/ignore", "set_model_update_ignore"),
+    RouteDefinition("GET", "/api/lm/{prefix}/updates/status/{model_id}", "get_model_update_status"),
     RouteDefinition("POST", "/api/lm/download-model", "download_model"),
     RouteDefinition("GET", "/api/lm/download-model-get", "download_model_get"),
     RouteDefinition("GET", "/api/lm/cancel-download-get", "cancel_download_get"),

py/services/model_update_service.py

@@ -0,0 +1,404 @@
+"""Service for tracking remote model version updates."""
+from __future__ import annotations
+
+import asyncio
+import json
+import logging
+import os
+import sqlite3
+import time
+from dataclasses import dataclass
+from typing import Dict, Iterable, List, Mapping, Optional, Sequence
+
+from .errors import RateLimitError
+
+logger = logging.getLogger(__name__)
+
+
+@dataclass
+class ModelUpdateRecord:
+    """Representation of a persisted update record."""
+
+    model_type: str
+    model_id: int
+    largest_version_id: Optional[int]
+    version_ids: List[int]
+    in_library_version_ids: List[int]
+    last_checked_at: Optional[float]
+    should_ignore: bool
+
+    def has_update(self) -> bool:
+        """Return True when remote versions exceed the local library."""
+
+        if self.should_ignore or not self.version_ids:
+            return False
+        local_versions = set(self.in_library_version_ids)
+        return any(version_id not in local_versions for version_id in self.version_ids)
+
+
+class ModelUpdateService:
+    """Persist and query remote model version metadata."""
+
+    _SCHEMA = """
+        CREATE TABLE IF NOT EXISTS model_update_status (
+            model_type TEXT NOT NULL,
+            model_id INTEGER NOT NULL,
+            largest_version_id INTEGER,
+            version_ids TEXT,
+            in_library_version_ids TEXT,
+            last_checked_at REAL,
+            should_ignore INTEGER DEFAULT 0,
+            PRIMARY KEY (model_type, model_id)
+        )
+    """
+
+    def __init__(self, db_path: str, *, ttl_seconds: int = 24 * 60 * 60) -> None:
+        self._db_path = db_path
+        self._ttl_seconds = ttl_seconds
+        self._lock = asyncio.Lock()
+        self._schema_initialized = False
+        self._ensure_directory()
+        self._initialize_schema()
+
+    def _ensure_directory(self) -> None:
+        directory = os.path.dirname(self._db_path)
+        if directory:
+            os.makedirs(directory, exist_ok=True)
+
+    def _connect(self) -> sqlite3.Connection:
+        conn = sqlite3.connect(self._db_path, check_same_thread=False)
+        conn.row_factory = sqlite3.Row
+        return conn
+
+    def _initialize_schema(self) -> None:
+        if self._schema_initialized:
+            return
+        try:
+            with self._connect() as conn:
+                conn.execute("PRAGMA journal_mode=WAL")
+                conn.execute("PRAGMA foreign_keys = ON")
+                conn.executescript(self._SCHEMA)
+            self._schema_initialized = True
+        except Exception as exc:  # pragma: no cover - defensive guard
+            logger.error("Failed to initialize update schema: %s", exc, exc_info=True)
+            raise
+
+    async def refresh_for_model_type(
+        self,
+        model_type: str,
+        scanner,
+        metadata_provider,
+        *,
+        force_refresh: bool = False,
+    ) -> Dict[int, ModelUpdateRecord]:
+        """Refresh update information for every model present in the cache."""
+
+        local_versions = await self._collect_local_versions(scanner)
+        results: Dict[int, ModelUpdateRecord] = {}
+        for model_id, version_ids in local_versions.items():
+            record = await self._refresh_single_model(
+                model_type,
+                model_id,
+                version_ids,
+                metadata_provider,
+                force_refresh=force_refresh,
+            )
+            if record:
+                results[model_id] = record
+        return results
+
+    async def refresh_single_model(
+        self,
+        model_type: str,
+        model_id: int,
+        scanner,
+        metadata_provider,
+        *,
+        force_refresh: bool = False,
+    ) -> Optional[ModelUpdateRecord]:
+        """Refresh update information for a specific model id."""
+
+        local_versions = await self._collect_local_versions(scanner)
+        version_ids = local_versions.get(model_id, [])
+        return await self._refresh_single_model(
+            model_type,
+            model_id,
+            version_ids,
+            metadata_provider,
+            force_refresh=force_refresh,
+        )
+
+    async def update_in_library_versions(
+        self,
+        model_type: str,
+        model_id: int,
+        version_ids: Sequence[int],
+    ) -> ModelUpdateRecord:
+        """Persist a new set of in-library version identifiers."""
+
+        normalized_versions = self._normalize_sequence(version_ids)
+        async with self._lock:
+            existing = self._get_record(model_type, model_id)
+            record = ModelUpdateRecord(
+                model_type=model_type,
+                model_id=model_id,
+                largest_version_id=existing.largest_version_id if existing else None,
+                version_ids=list(existing.version_ids) if existing else [],
+                in_library_version_ids=normalized_versions,
+                last_checked_at=existing.last_checked_at if existing else None,
+                should_ignore=existing.should_ignore if existing else False,
+            )
+            self._upsert_record(record)
+            return record
+
+    async def set_should_ignore(
+        self, model_type: str, model_id: int, should_ignore: bool
+    ) -> ModelUpdateRecord:
+        """Toggle the ignore flag for a model."""
+
+        async with self._lock:
+            existing = self._get_record(model_type, model_id)
+            if existing:
+                record = ModelUpdateRecord(
+                    model_type=model_type,
+                    model_id=model_id,
+                    largest_version_id=existing.largest_version_id,
+                    version_ids=list(existing.version_ids),
+                    in_library_version_ids=list(existing.in_library_version_ids),
+                    last_checked_at=existing.last_checked_at,
+                    should_ignore=should_ignore,
+                )
+            else:
+                record = ModelUpdateRecord(
+                    model_type=model_type,
+                    model_id=model_id,
+                    largest_version_id=None,
+                    version_ids=[],
+                    in_library_version_ids=[],
+                    last_checked_at=None,
+                    should_ignore=should_ignore,
+                )
+            self._upsert_record(record)
+            return record
+
+    async def get_record(self, model_type: str, model_id: int) -> Optional[ModelUpdateRecord]:
+        """Return a cached record without triggering remote fetches."""
+
+        async with self._lock:
+            return self._get_record(model_type, model_id)
+
+    async def has_update(self, model_type: str, model_id: int) -> bool:
+        """Determine if a model has updates pending."""
+
+        record = await self.get_record(model_type, model_id)
+        return record.has_update() if record else False
+
+    async def _refresh_single_model(
+        self,
+        model_type: str,
+        model_id: int,
+        local_versions: Sequence[int],
+        metadata_provider,
+        *,
+        force_refresh: bool = False,
+    ) -> Optional[ModelUpdateRecord]:
+        normalized_local = self._normalize_sequence(local_versions)
+        now = time.time()
+        async with self._lock:
+            existing = self._get_record(model_type, model_id)
+            if existing and existing.should_ignore and not force_refresh:
+                record = ModelUpdateRecord(
+                    model_type=model_type,
+                    model_id=model_id,
+                    largest_version_id=existing.largest_version_id,
+                    version_ids=list(existing.version_ids),
+                    in_library_version_ids=normalized_local,
+                    last_checked_at=existing.last_checked_at,
+                    should_ignore=True,
+                )
+                self._upsert_record(record)
+                return record
+
+            should_fetch = force_refresh or not existing or self._is_stale(existing, now)
+        # release lock during network request
+        fetched_versions: List[int] | None = None
+        if metadata_provider and should_fetch:
+            try:
+                response = await metadata_provider.get_model_versions(model_id)
+            except RateLimitError:
+                raise
+            except Exception as exc:  # pragma: no cover - defensive log
+                logger.error(
+                    "Failed to fetch versions for model %s (%s): %s",
+                    model_id,
+                    model_type,
+                    exc,
+                    exc_info=True,
+                )
+            else:
+                fetched_versions = self._extract_version_ids(response)
+
+        async with self._lock:
+            existing = self._get_record(model_type, model_id)
+            if existing and existing.should_ignore and not force_refresh:
+                # Ignore state could have flipped while awaiting provider
+                record = ModelUpdateRecord(
+                    model_type=model_type,
+                    model_id=model_id,
+                    largest_version_id=existing.largest_version_id,
+                    version_ids=list(existing.version_ids),
+                    in_library_version_ids=normalized_local,
+                    last_checked_at=existing.last_checked_at,
+                    should_ignore=True,
+                )
+                self._upsert_record(record)
+                return record
+
+            version_ids = (
+                fetched_versions
+                if fetched_versions is not None
+                else (list(existing.version_ids) if existing else [])
+            )
+            largest = max(version_ids) if version_ids else None
+            last_checked = now if fetched_versions is not None else (
+                existing.last_checked_at if existing else None
+            )
+            record = ModelUpdateRecord(
+                model_type=model_type,
+                model_id=model_id,
+                largest_version_id=largest,
+                version_ids=version_ids,
+                in_library_version_ids=normalized_local,
+                last_checked_at=last_checked,
+                should_ignore=existing.should_ignore if existing else False,
+            )
+            self._upsert_record(record)
+            return record
+
+    async def _collect_local_versions(self, scanner) -> Dict[int, List[int]]:
+        cache = await scanner.get_cached_data()
+        mapping: Dict[int, set[int]] = {}
+        if not cache or not getattr(cache, "raw_data", None):
+            return {}
+
+        for item in cache.raw_data:
+            civitai = item.get("civitai") if isinstance(item, dict) else None
+            if not isinstance(civitai, dict):
+                continue
+            model_id = self._normalize_int(civitai.get("modelId"))
+            version_id = self._normalize_int(civitai.get("id"))
+            if model_id is None or version_id is None:
+                continue
+            mapping.setdefault(model_id, set()).add(version_id)
+
+        return {model_id: sorted(ids) for model_id, ids in mapping.items()}
+
+    def _is_stale(self, record: ModelUpdateRecord, now: float) -> bool:
+        if record.last_checked_at is None:
+            return True
+        return (now - record.last_checked_at) >= self._ttl_seconds
+
+    @staticmethod
+    def _normalize_int(value) -> Optional[int]:
+        try:
+            if value is None:
+                return None
+            return int(value)
+        except (TypeError, ValueError):
+            return None
+
+    def _normalize_sequence(self, values: Sequence[int]) -> List[int]:
+        normalized = [
+            item
+            for item in (self._normalize_int(value) for value in values)
+            if item is not None
+        ]
+        return sorted(dict.fromkeys(normalized))
+
+    def _extract_version_ids(self, response) -> List[int]:
+        if not isinstance(response, Mapping):
+            return []
+        versions = response.get("modelVersions")
+        if not isinstance(versions, Iterable):
+            return []
+        normalized = []
+        for entry in versions:
+            if isinstance(entry, Mapping):
+                normalized_id = self._normalize_int(entry.get("id"))
+            else:
+                normalized_id = self._normalize_int(entry)
+            if normalized_id is not None:
+                normalized.append(normalized_id)
+        return sorted(dict.fromkeys(normalized))
+
+    def _get_record(self, model_type: str, model_id: int) -> Optional[ModelUpdateRecord]:
+        with self._connect() as conn:
+            row = conn.execute(
+                """
+                SELECT model_type, model_id, largest_version_id, version_ids,
+                       in_library_version_ids, last_checked_at, should_ignore
+                FROM model_update_status
+                WHERE model_type = ? AND model_id = ?
+                """,
+                (model_type, model_id),
+            ).fetchone()
+        if not row:
+            return None
+        return ModelUpdateRecord(
+            model_type=row["model_type"],
+            model_id=int(row["model_id"]),
+            largest_version_id=self._normalize_int(row["largest_version_id"]),
+            version_ids=self._deserialize_json_array(row["version_ids"]),
+            in_library_version_ids=self._deserialize_json_array(
+                row["in_library_version_ids"]
+            ),
+            last_checked_at=row["last_checked_at"],
+            should_ignore=bool(row["should_ignore"]),
+        )
+
+    def _upsert_record(self, record: ModelUpdateRecord) -> None:
+        payload = (
+            record.model_type,
+            record.model_id,
+            record.largest_version_id,
+            json.dumps(record.version_ids),
+            json.dumps(record.in_library_version_ids),
+            record.last_checked_at,
+            1 if record.should_ignore else 0,
+        )
+        with self._connect() as conn:
+            conn.execute(
+                """
+                INSERT INTO model_update_status (
+                    model_type, model_id, largest_version_id, version_ids,
+                    in_library_version_ids, last_checked_at, should_ignore
+                ) VALUES (?, ?, ?, ?, ?, ?, ?)
+                ON CONFLICT(model_type, model_id) DO UPDATE SET
+                    largest_version_id = excluded.largest_version_id,
+                    version_ids = excluded.version_ids,
+                    in_library_version_ids = excluded.in_library_version_ids,
+                    last_checked_at = excluded.last_checked_at,
+                    should_ignore = excluded.should_ignore
+                """,
+                payload,
+            )
+            conn.commit()
+
+    @staticmethod
+    def _deserialize_json_array(value) -> List[int]:
+        if not value:
+            return []
+        try:
+            data = json.loads(value)
+        except (TypeError, json.JSONDecodeError):
+            return []
+        if isinstance(data, list):
+            normalized = []
+            for entry in data:
+                try:
+                    normalized.append(int(entry))
+                except (TypeError, ValueError):
+                    continue
+            return sorted(dict.fromkeys(normalized))
+        return []
+

py/services/persistent_model_cache.py

@@ -81,6 +81,11 @@ class PersistentModelCache:
     def is_enabled(self) -> bool:
         return os.environ.get("LORA_MANAGER_DISABLE_PERSISTENT_CACHE", "0") != "1"
 
+    def get_database_path(self) -> str:
+        """Expose the resolved SQLite database path."""
+
+        return self._db_path
+
     def load_cache(self, model_type: str) -> Optional[PersistedCacheData]:
         if not self.is_enabled():
             return None

py/services/service_registry.py

@@ -128,23 +128,45 @@ class ServiceRegistry:
     async def get_civitai_client(cls):
         """Get or create CivitAI client instance"""
         service_name = "civitai_client"
-        
+
         if service_name in cls._services:
             return cls._services[service_name]
-        
+
         async with cls._get_lock(service_name):
             # Double-check after acquiring lock
             if service_name in cls._services:
                 return cls._services[service_name]
-            
+
             # Import here to avoid circular imports
             from .civitai_client import CivitaiClient
-            
+
             client = await CivitaiClient.get_instance()
             cls._services[service_name] = client
             logger.debug(f"Created and registered {service_name}")
             return client
 
+    @classmethod
+    async def get_model_update_service(cls):
+        """Get or create the model update tracking service."""
+
+        service_name = "model_update_service"
+
+        if service_name in cls._services:
+            return cls._services[service_name]
+
+        async with cls._get_lock(service_name):
+            if service_name in cls._services:
+                return cls._services[service_name]
+
+            from .model_update_service import ModelUpdateService
+            from .persistent_model_cache import get_persistent_cache
+
+            cache = get_persistent_cache()
+            service = ModelUpdateService(cache.get_database_path())
+            cls._services[service_name] = service
+            logger.debug(f"Created and registered {service_name}")
+            return service
+
     @classmethod
     async def get_civarchive_client(cls):
         """Get or create CivArchive client instance"""

tests/routes/test_base_model_routes_smoke.py

@@ -5,6 +5,7 @@ import sys
 from pathlib import Path
 
 import types
+from dataclasses import dataclass, field
 from typing import Optional
 
 folder_paths_stub = types.SimpleNamespace(get_folder_paths=lambda *_: [])
@@ -32,6 +33,41 @@ class DummyRoutes(BaseModelRoutes):
     def setup_specific_routes(self, registrar, prefix: str) -> None:  # pragma: no cover - no extra routes in smoke tests
         return None
 
+    def __init__(self, service=None):
+        super().__init__(service)
+        self.set_model_update_service(NullModelUpdateService())
+
+
+@dataclass
+class NullUpdateRecord:
+    model_type: str
+    model_id: int
+    largest_version_id: int | None = None
+    version_ids: list[int] = field(default_factory=list)
+    in_library_version_ids: list[int] = field(default_factory=list)
+    last_checked_at: float | None = None
+    should_ignore: bool = False
+
+    def has_update(self) -> bool:
+        return False
+
+
+class NullModelUpdateService:
+    async def refresh_for_model_type(self, *args, **kwargs):
+        return {}
+
+    async def refresh_single_model(self, *args, **kwargs):
+        return None
+
+    async def update_in_library_versions(self, model_type, model_id, version_ids):
+        return NullUpdateRecord(model_type=model_type, model_id=model_id, in_library_version_ids=list(version_ids))
+
+    async def set_should_ignore(self, model_type, model_id, should_ignore):
+        return NullUpdateRecord(model_type=model_type, model_id=model_id, should_ignore=should_ignore)
+
+    async def get_record(self, *args, **kwargs):
+        return None
+
 
 async def create_test_client(service) -> TestClient:
     routes = DummyRoutes(service)

tests/services/test_model_update_service.py

@@ -0,0 +1,85 @@
+import asyncio
+from types import SimpleNamespace
+
+import pytest
+
+from py.services.model_update_service import ModelUpdateService
+
+
+class DummyScanner:
+    def __init__(self, raw_data):
+        self._cache = SimpleNamespace(raw_data=raw_data)
+
+    async def get_cached_data(self, *args, **kwargs):
+        return self._cache
+
+
+class DummyProvider:
+    def __init__(self, response):
+        self.response = response
+        self.calls: int = 0
+
+    async def get_model_versions(self, model_id):
+        self.calls += 1
+        return self.response
+
+
+@pytest.mark.asyncio
+async def test_refresh_persists_versions_and_uses_cache(tmp_path):
+    db_path = tmp_path / "updates.sqlite"
+    service = ModelUpdateService(str(db_path), ttl_seconds=3600)
+    raw_data = [
+        {"civitai": {"modelId": 1, "id": 11}},
+        {"civitai": {"modelId": 1, "id": 15}},
+    ]
+    scanner = DummyScanner(raw_data)
+    provider = DummyProvider({"modelVersions": [{"id": 11}, {"id": 15}]})
+
+    await service.refresh_for_model_type("lora", scanner, provider)
+    record = await service.get_record("lora", 1)
+
+    assert provider.calls == 1
+    assert record is not None
+    assert record.version_ids == [11, 15]
+    assert record.in_library_version_ids == [11, 15]
+    assert record.has_update() is False
+
+    await service.refresh_for_model_type("lora", scanner, provider)
+    assert provider.calls == 1, "provider should not be called again within TTL"
+
+
+@pytest.mark.asyncio
+async def test_refresh_respects_ignore_flag(tmp_path):
+    db_path = tmp_path / "updates.sqlite"
+    service = ModelUpdateService(str(db_path), ttl_seconds=3600)
+    raw_data = [{"civitai": {"modelId": 2, "id": 21}}]
+    scanner = DummyScanner(raw_data)
+    provider = DummyProvider({"modelVersions": [{"id": 21}, {"id": 22}]})
+
+    await service.refresh_for_model_type("lora", scanner, provider)
+    await service.set_should_ignore("lora", 2, True)
+
+    provider.calls = 0
+    await service.refresh_for_model_type("lora", scanner, provider)
+    assert provider.calls == 0
+
+
+@pytest.mark.asyncio
+async def test_update_in_library_versions_changes_update_state(tmp_path):
+    db_path = tmp_path / "updates.sqlite"
+    service = ModelUpdateService(str(db_path), ttl_seconds=1)
+    raw_data = [{"civitai": {"modelId": 3, "id": 31}}]
+    scanner = DummyScanner(raw_data)
+    provider = DummyProvider({"modelVersions": [{"id": 31}, {"id": 35}]})
+
+    await service.refresh_for_model_type("lora", scanner, provider)
+    await service.update_in_library_versions("lora", 3, [31])
+    record = await service.get_record("lora", 3)
+
+    assert record is not None
+    assert record.has_update() is True
+
+    await service.update_in_library_versions("lora", 3, [31, 35])
+    record = await service.get_record("lora", 3)
+
+    assert record.has_update() is False