Mus 19 library sync completing with issues (#29)

* fix: Sync issues - AudioDB warmig +  automatic sync skips

* progress ui/ux + discovery and album fixes

* artist fixes

* several request level fixes and improvements

* handle request fails + artist refresh + resilience fixes

* fix format

* fix stop sync fail + last.fn mbid issues + failures/validation reworks

backend/api/v1/routes/artists.py

@@ -36,7 +36,7 @@ async def get_artist(
         )
     
     try:
-        result = await artist_service.get_artist_info(artist_id)
+        result = await artist_service.get_artist_info_basic(artist_id)
         ctx = try_get_degradation_context()
         if ctx and ctx.has_degradation():
             result = msgspec.structs.replace(result, service_status=ctx.degraded_summary())

backend/api/v1/routes/cache_status.py

@@ -36,6 +36,17 @@ async def get_sync_status(
     )
 
 
+@router.post("/cancel")
+async def cancel_sync(
+    status_service: CacheStatusService = Depends(get_cache_status_service),
+):
+    from core.task_registry import TaskRegistry
+    await status_service.cancel_current_sync()
+    TaskRegistry.get_instance().cancel("precache-library")
+    await status_service.wait_for_completion()
+    return {"status": "cancelled"}
+
+
 @router.get("/stream")
 async def stream_sync_status(
     status_service: CacheStatusService = Depends(get_cache_status_service),

backend/api/v1/schemas/advanced_settings.py

@@ -62,8 +62,8 @@ class AdvancedSettings(AppStruct):
     delay_albums: float = 0.3
     artist_discovery_warm_interval: int = 14400
     artist_discovery_warm_delay: float = 0.5
-    artist_discovery_precache_delay: float = 0.3
-    artist_discovery_precache_concurrency: int = 3
+    artist_discovery_precache_delay: float = 0.2
+    artist_discovery_precache_concurrency: int = 5
     memory_cache_max_entries: int = 10000
     memory_cache_cleanup_interval: int = 300
     cover_memory_cache_max_entries: int = 128
@@ -237,7 +237,7 @@ class AdvancedSettingsFrontend(AppStruct):
     delay_albums: float = 0.3
     artist_discovery_warm_interval: int = 240
     artist_discovery_warm_delay: float = 0.5
-    artist_discovery_precache_delay: float = 0.3
+    artist_discovery_precache_delay: float = 0.2
     memory_cache_max_entries: int = 10000
     memory_cache_cleanup_interval: int = 300
     cover_memory_cache_max_entries: int = 128
@@ -285,7 +285,7 @@ class AdvancedSettingsFrontend(AppStruct):
     audiodb_prewarm_concurrency: int = 4
     audiodb_prewarm_delay: float = 0.3
     request_concurrency: int = 2
-    artist_discovery_precache_concurrency: int = 3
+    artist_discovery_precache_concurrency: int = 5
 
     def __post_init__(self) -> None:
         int_coerce_fields = [