yet another preventative fix

js/accounts/pocketbase.js

@@ -677,7 +677,35 @@ const syncManager = {
                         user_folders: Object.values(userFolders).filter((f) => f && typeof f === 'object'),
                     };
 
-                    await database.importData(convertedData);
+                    // Safety check: if we had local data but merged result is completely empty, something went wrong.
+                    // Do NOT call importData as it would wipe the user's local stores.
+                    const hadLocalData =
+                        localData.tracks.length > 0 ||
+                        localData.albums.length > 0 ||
+                        localData.artists.length > 0 ||
+                        localData.playlists.length > 0 ||
+                        localData.mixes.length > 0 ||
+                        localData.history.length > 0 ||
+                        localData.userPlaylists.length > 0 ||
+                        localData.userFolders.length > 0;
+
+                    const isConvertedEmpty =
+                        convertedData.favorites_tracks.length === 0 &&
+                        convertedData.favorites_albums.length === 0 &&
+                        convertedData.favorites_artists.length === 0 &&
+                        convertedData.favorites_playlists.length === 0 &&
+                        convertedData.favorites_mixes.length === 0 &&
+                        convertedData.history_tracks.length === 0 &&
+                        convertedData.user_playlists.length === 0 &&
+                        convertedData.user_folders.length === 0;
+
+                    if (hadLocalData && isConvertedEmpty) {
+                        console.warn(
+                            '[PocketBase] Sync aborted: local data exists but merged result is empty. Preserving local data to prevent accidental wipe.'
+                        );
+                    } else {
+                        await database.importData(convertedData, true);
+                    }
                     await new Promise((resolve) => setTimeout(resolve, 300));
 
                     window.dispatchEvent(new CustomEvent('library-changed'));

js/app.js

@@ -412,6 +412,13 @@ async function uploadCoverImage(file) {
 document.addEventListener('DOMContentLoaded', async () => {
     await modernSettings.waitPending();
 
+    // Request persistent storage to reduce risk of browser wiping data on updates or cleanup
+    if (navigator.storage && navigator.storage.persist) {
+        navigator.storage.persist().catch(() => {
+            // Ignore errors; persistence is a best-effort request
+        });
+    }
+
     if (import.meta.env.DEV) {
         window.monochrome = {
             HiFiClient,

js/db.js

@@ -455,6 +455,25 @@ export class MusicDatabase {
     async importData(data, clear = false) {
         const db = await this.open();
 
+        // Safety check: if clear=true but all data is empty, skip to avoid wiping existing data
+        if (clear) {
+            const allEmpty = [
+                data.favorites_tracks,
+                data.favorites_albums,
+                data.favorites_artists,
+                data.favorites_playlists,
+                data.favorites_mixes,
+                data.history_tracks,
+                data.user_playlists,
+                data.user_folders,
+            ].every((arr) => !arr || (Array.isArray(arr) ? arr.length === 0 : Object.keys(arr).length === 0));
+
+            if (allEmpty) {
+                console.warn('[importData] Aborting: clear=true but all import data is empty. Existing data preserved.');
+                return false;
+            }
+        }
+
         const importStore = async (storeName, items) => {
             if (items === undefined) return false;
 
@@ -488,9 +507,10 @@ export class MusicDatabase {
                 const transaction = db.transaction(storeName, 'readwrite');
                 const store = transaction.objectStore(storeName);
 
-                // force clear on first sync
-                console.log(`Clearing ${storeName} to Make Sure Everythings Good`);
-                store.clear();
+                if (clear) {
+                    console.log(`[importData] Clearing ${storeName} before import`);
+                    store.clear();
+                }
 
                 itemsArray.forEach((item) => {
                     if (item.id && typeof item.id === 'string' && !isNaN(item.id)) {

js/settings.js

@@ -6573,7 +6573,7 @@ export async function initializeSettings(scrobbler, player, api, ui) {
         reader.onload = async (event) => {
             try {
                 const data = JSON.parse(event.target.result);
-                await db.importData(data);
+                await db.importData(data, true);
                 alert('Library imported successfully!');
                 window.location.reload(); // Simple way to refresh all state
             } catch (err) {