feat: 'In Library' badges, artist images on local pages, MBID-based Tier 3

Three features wired together:

1. 'In Library' badges on explore search results:
   CheckLibraryMBIDs Wails binding batch-checks which search result
   MBIDs exist in the local library. Green badges render on matching
   artist cards and album cards.

2. Artist images on local artist-details page:
   Local artist pages now call GetArtistMBID(name) to resolve the
   MBID from tags, then GetArtistImageURL(mbid) to fetch the cached
   Wikimedia photo. Falls back to initial-letter avatar.

3. Tier 3 search index uses direct MBIDs from tags:
   buildTier3Library now reads artists.mbid column (from audio tags)
   for direct MBID matching, falling back to name matching for
   untagged artists. Eliminates false matches and catches artists
   that name matching misses.

backend/database/sql/sqlcgen/models.go

@@ -49,6 +49,15 @@ type CoverArt struct {
 	MimeType   string
 }
 
+type ExploreCache struct {
+	UrlKey     string
+	Response   string
+	Mbid       sql.NullString
+	EntityType sql.NullString
+	ExpiresAt  time.Time
+	CreatedAt  time.Time
+}
+
 type FileType struct {
 	ID        int64
 	Extension string

backend/explore/explore.go

@@ -24,6 +24,7 @@ type Service struct {
 	index     *SearchIndex
 	artProxy  *CoverArtProxy
 	artistImg *ArtistImageProvider
+	libMBID   *LibraryMBIDIndex
 	logger    *slog.Logger
 	ctx       context.Context
 }
@@ -41,6 +42,7 @@ func NewExploreService(logger *slog.Logger, db *database.DB) *Service {
 		db, cache, NewRateLimiter(), logger.WithGroup("artist-image"),
 	)
 	index := NewSearchIndex(db, lb, artistImg, logger.WithGroup("search-index"))
+	libMBID := NewLibraryMBIDIndex(db)
 
 	logger.Info("explore service created")
 
@@ -51,6 +53,7 @@ func NewExploreService(logger *slog.Logger, db *database.DB) *Service {
 		index:     index,
 		artProxy:  artProxy,
 		artistImg: artistImg,
+		libMBID:   libMBID,
 		logger:    logger,
 		ctx:       context.Background(),
 	}
@@ -198,6 +201,19 @@ func (e *Service) GetArtistImageURL(artistMBID string) string {
 	return e.artistImg.GetArtistImage(artistMBID)
 }
 
+// CheckLibraryMBIDs returns which of the given MBIDs exist in the
+// local music library.  Returns a map of MBID → entity type
+// ("artist", "release_group", "recording").
+func (e *Service) CheckLibraryMBIDs(mbids []string) map[string]string {
+	return e.libMBID.CheckMBIDs(mbids)
+}
+
+// GetArtistMBID returns the MusicBrainz ID for a local library
+// artist by name, or "" if not found or no MBID tagged.
+func (e *Service) GetArtistMBID(artistName string) string {
+	return e.libMBID.GetArtistMBID(artistName)
+}
+
 // Search concurrently queries MusicBrainz for artists, release
 // groups, and recordings matching the query, then boosts results
 // using ListenBrainz popularity data.  The final score blends

backend/explore/searchindex.go

@@ -683,8 +683,11 @@ func (si *SearchIndex) buildTier3Library(
 		}
 	}
 
-	// Read local library artist names.
+	// Read local library artists — prefer direct MBIDs from tags,
-	libRows, err := si.db.QueryContext("SELECT DISTINCT name FROM artists")
+	// fall back to name matching against the sitewide/index map.
+	libRows, err := si.db.QueryContext(
+		"SELECT DISTINCT name, mbid FROM artists",
+	)
 	if err != nil {
 		si.logger.Warn("search index: library artists query failed", "error", err)
 
@@ -693,18 +696,35 @@ func (si *SearchIndex) buildTier3Library(
 
 	defer func() { _ = libRows.Close() }()
 
-	// Collect MBIDs for matched library artists.
 	var matched []lbSitewideArtist
 
 	var resolvedMBIDs []string
 
 	for libRows.Next() {
 		var name string
-		if err := libRows.Scan(&name); err != nil {
+
+		var mbidPtr *string
+
+		if err := libRows.Scan(&name, &mbidPtr); err != nil {
 			continue
 		}
 
-		// Normalize: strip "feat." suffixes.
+		// Direct MBID from tags — most reliable.
+		if mbidPtr != nil && *mbidPtr != "" {
+			mbid := *mbidPtr
+			resolvedMBIDs = append(resolvedMBIDs, mbid)
+
+			if !indexed[mbid] {
+				matched = append(matched, lbSitewideArtist{
+					ArtistMBID: mbid,
+					ArtistName: name,
+				})
+			}
+
+			continue
+		}
+
+		// Fall back to name matching.
 		normalized := strings.ToLower(name)
 		if idx := strings.Index(normalized, " feat."); idx >= 0 {
 			normalized = normalized[:idx]
@@ -719,7 +739,6 @@ func (si *SearchIndex) buildTier3Library(
 		if a, ok := nameMap[normalized]; ok {
 			resolvedMBIDs = append(resolvedMBIDs, a.ArtistMBID)
 
-			// Only index if not already in the index from Tier 2.
 			if !indexed[a.ArtistMBID] {
 				matched = append(matched, a)
 			}

frontend/src/components/artist-details/artist-details.ts

@@ -6,6 +6,7 @@ import {
 } from 'lit/decorators.js';
 import { library } from '@go/models';
 import { LibraryController } from '@store/controllers/library-controller';
+import { GetArtistImageURL, GetArtistMBID } from '@go/explore/Service';
 import '@awesome.me/webawesome/dist/components/icon/icon.js';
 import '@components/cover-grid/cover-grid.js';
 import { designTokens } from '../../styles/tokens.css';
@@ -18,12 +19,18 @@ export class ArtistDetails extends LitElement {
     @property({ type: String, attribute: 'artist-name' })
     artistName = '';
 
+    @property({ type: String, attribute: 'artist-mbid' })
+    artistMBID = '';
+
     @state()
     private albums: library.Album[] = [];
 
     @state()
     private loading = true;
 
+    @state()
+    private artistImageURL = '';
+
     private libraryCtrl = new LibraryController(this);
 
     /** Tracks the store's cached array reference to detect refreshes. */
@@ -99,6 +106,12 @@ export class ArtistDetails extends LitElement {
             flex-shrink: 0;
         }
 
+        .artist-avatar img {
+            width: 100%;
+            height: 100%;
+            object-fit: cover;
+        }
+
         .artist-avatar .initial {
             color: var(
                 --yj-text-secondary,
@@ -156,6 +169,7 @@ export class ArtistDetails extends LitElement {
     override connectedCallback() {
         super.connectedCallback();
         this.loadAlbums();
+        this.loadArtistImage();
     }
 
     override updated() {
@@ -174,6 +188,31 @@ export class ArtistDetails extends LitElement {
      * Data loading
      * ================================================================ */
 
+    private async loadArtistImage() {
+        // Resolve MBID from tags if not provided via attribute.
+        let mbid = this.artistMBID;
+
+        if (!mbid && this.artistName) {
+            try {
+                mbid = await GetArtistMBID(this.artistName);
+            } catch {
+                return;
+            }
+        }
+
+        if (!mbid) return;
+
+        try {
+            const url = await GetArtistImageURL(mbid);
+
+            if (url) {
+                this.artistImageURL = url;
+            }
+        } catch {
+            // No image — avatar stays as initial letter.
+        }
+    }
+
     private async loadAlbums() {
         if (!this.artistId) return;
 
@@ -293,11 +332,14 @@ export class ArtistDetails extends LitElement {
                     ></wa-icon>
                 </button>
                 <div class="artist-avatar">
-                    <span class="initial">
+                    ${this.artistImageURL
-                        ${this.getInitial(
+                        ? html`<img
-                            this.artistName,
+                              src="${this.artistImageURL}"
-                        )}
+                              alt="${this.artistName}"
-                    </span>
+                          />`
+                        : html`<span class="initial">
+                              ${this.getInitial(this.artistName)}
+                          </span>`}
                 </div>
                 <div class="artist-info">
                     <h1

frontend/src/components/explore-view/explore-view.ts

@@ -1,7 +1,7 @@
 import { LitElement, html, css, nothing } from 'lit';
 import { customElement, state, query as litQuery } from 'lit/decorators.js';
 import { designTokens } from '../../styles/tokens.css';
-import { Search, GetThumbnails, GetArtistImageURL } from '@go/explore/Service';
+import { Search, GetThumbnails, GetArtistImageURL, CheckLibraryMBIDs } from '@go/explore/Service';
 import type { ThumbnailRequest } from '@go/explore/Service';
 import type {
     MBSearchResult,
@@ -77,6 +77,7 @@ export class ExploreView extends LitElement {
     private debounceTimer: ReturnType<typeof setTimeout> | null = null;
     private thumbnailCache = new Map<string, string>();
     private artistImageCache = new Map<string, string>();
+    private libraryMBIDs = new Set<string>();
 
     @litQuery('input') private inputEl!: HTMLInputElement;
 
@@ -432,6 +433,16 @@ export class ExploreView extends LitElement {
                 white-space: nowrap;
             }
 
+            .library-badge {
+                background: var(--yj-accent, #1db954);
+                color: #000;
+                padding: 1px 6px;
+                border-radius: 3px;
+                font-size: 10px;
+                font-weight: 600;
+                white-space: nowrap;
+            }
+
             /* ── Track list ── */
             .track-list {
                 display: flex;
@@ -577,6 +588,7 @@ export class ExploreView extends LitElement {
             this.results = result;
             this.loadThumbnails();
             this.loadArtistImages();
+            this.checkLibrary();
 
             const elapsed = (performance.now() - startTime).toFixed(0);
             console.log(
@@ -688,6 +700,39 @@ export class ExploreView extends LitElement {
         }
     }
 
+    /**
+     * Check which result MBIDs exist in the local library.
+     */
+    private async checkLibrary() {
+        if (!this.results) return;
+
+        const mbids: string[] = [];
+
+        for (const a of this.results.artists ?? []) {
+            if (a.mbid) mbids.push(a.mbid);
+        }
+
+        for (const rg of this.results.releaseGroups ?? []) {
+            if (rg.mbid) mbids.push(rg.mbid);
+        }
+
+        if (mbids.length === 0) return;
+
+        try {
+            const found = await CheckLibraryMBIDs(mbids);
+
+            if (found && Object.keys(found).length > 0) {
+                for (const mbid of Object.keys(found)) {
+                    this.libraryMBIDs.add(mbid);
+                }
+
+                this.requestUpdate();
+            }
+        } catch {
+            // Library check is non-critical.
+        }
+    }
+
     /* ── Top Results ── */
 
     private getTopResults(): ScoredItem[] {
@@ -966,6 +1011,9 @@ export class ExploreView extends LitElement {
                                           ${a.country}
                                       </div>`
                                     : nothing}
+                                ${this.libraryMBIDs.has(a.mbid)
+                                    ? html`<div class="library-badge">In Library</div>`
+                                    : nothing}
                             </div>
                         `;
                     })}
@@ -1016,6 +1064,9 @@ export class ExploreView extends LitElement {
                                 </div>
                                 <div class="album-artist">${rg.artistCredit}</div>
                                 <div class="album-meta">
+                                    ${this.libraryMBIDs.has(rg.mbid)
+                                        ? html`<span class="library-badge">In Library</span>`
+                                        : nothing}
                                     ${rg.primaryType
                                         ? html`<span class="type-badge"
                                               >${rg.primaryType}</span

frontend/wailsjs/go/explore/Service.d.ts

@@ -35,3 +35,6 @@ export function SimilarArtists(arg1:string):Promise<Array<explore.LBSimilarArtis
 
 export function TopRecordingsForArtist(arg1:string):Promise<Array<explore.LBTopRecording>>;
 
+export function CheckLibraryMBIDs(arg1:string[]):Promise<Record<string, string>>;
+
+export function GetArtistMBID(arg1:string):Promise<string>;

frontend/wailsjs/go/explore/Service.js

@@ -65,3 +65,11 @@ export function SimilarArtists(arg1) {
 export function TopRecordingsForArtist(arg1) {
   return window['go']['explore']['Service']['TopRecordingsForArtist'](arg1);
 }
+
+export function CheckLibraryMBIDs(arg1) {
+  return window['go']['explore']['Service']['CheckLibraryMBIDs'](arg1);
+}
+
+export function GetArtistMBID(arg1) {
+  return window['go']['explore']['Service']['GetArtistMBID'](arg1);
+}

frontend/wailsjs/go/models.ts

@@ -197,6 +197,23 @@ export namespace explore {
 		}
 	}
 	
+	export class ThumbnailRequest {
+	    mbid: string;
+	    albumName: string;
+	    artistName: string;
+	
+	    static createFrom(source: any = {}) {
+	        return new ThumbnailRequest(source);
+	    }
+	
+	    constructor(source: any = {}) {
+	        if ('string' === typeof source) source = JSON.parse(source);
+	        this.mbid = source["mbid"];
+	        this.albumName = source["albumName"];
+	        this.artistName = source["artistName"];
+	    }
+	}
+
 }
 
 export namespace library {