Decouple browse views from FTS

AGENTS.md

@@ -30,6 +30,7 @@ This document orients automation agents and contributors to the mp3-com-meta-bro
 - Expect to run entirely client-side; the database is opened with read-only mode via `sql.js`.
 - Always page results with `LIMIT ? OFFSET ?`; avoid `SELECT *` unless fetching a single record by ID.
 - Prefer prepared statements or cached query strings when querying repeatedly.
+- Reserve FTS (`fts_tracks`) for the free-text Track Search overlay; browse views should stick to indexed base tables to keep fan-out predictable.
 - HTTP servers used in development or deployment must send `Accept-Ranges: bytes` so the VFS can issue range requests.
 
 ## Database Schema

README.md

@@ -3,7 +3,8 @@
 mp3-com-meta-browser is a static single-page web app for exploring the salvaged mp3.com metadata catalog. All queries run entirely in the browser against a read-only SQLite database compiled to WebAssembly, so the site can be hosted on any static file server.
 
 ## Highlights
-- Client-side full-text search (FTS5) across track titles, artists, albums, and genres.
+- Client-side full-text search (FTS5) powers the dedicated track search overlay.
+- Browse views query indexed base tables directly for predictable pagination (no FTS fan-out).
 - Responsive Bulma-based UI with dedicated views for search, browse (artists, albums, years, genres), and dataset stats.
 - Overlay detail panels for artists, albums, and tracks with keyboard navigation support.
 - Zero server dependencies beyond serving static assets with HTTP range support.
@@ -39,10 +40,12 @@ Add future static assets (icons, fonts, etc.) under `assets/`.
 
 ## Using the App
 - **Search:** Free-text search with 250 ms debounce. Toggle between relevance and alphabetical sorting. Keyboard: `/` focuses search, `Enter` activates the highlighted row.
-- **Browse Artists / Albums / Years / Genres:** Paginated listings with quick filters (artists leverage FTS prefix queries for fast prefix matching). Selecting an entry opens the corresponding overlay.
+- **Browse Artists / Albums / Years / Genres:** Paginated listings with quick filters backed by indexed table queries (`artists`, `albums`, `tracks`). Selecting an entry opens the corresponding overlay.
 - **Stats:** Summary cards pull from pre-computed counters in `site_stats` and link into browse views with preset filters.
 - **Overlays:** Artist, album, and track overlays show detailed metadata. `Esc` closes the top overlay and focus returns to the invoker.
 
+Only the Track Search overlay issues FTS queries. Browse views stay on indexed base tables so pagination remains predictable and light on resources.
+
 ## Keyboard & Accessibility Notes
 - Global shortcuts: `/` for search, `Esc` to close overlays.
 - Lists expose arrow navigation with `Enter` activation when focused.

script.js

@@ -1471,38 +1471,6 @@
       ORDER BY name COLLATE NOCASE
       LIMIT ${pageSize} OFFSET ${offset}
     `;
-    const ftsCountSql = `
-      SELECT COUNT(*) AS count FROM (
-        SELECT a.id
-        FROM fts_tracks
-        JOIN tracks t ON t.id = fts_tracks.rowid
-        JOIN artists a ON a.id = t.artist_id
-        WHERE fts_tracks MATCH ?
-        GROUP BY a.id
-      ) AS matches
-    `;
-    const buildFtsRowsSql = (pageSize, offset) => `
-      SELECT a.id, a.name
-      FROM fts_tracks
-      JOIN tracks t ON t.id = fts_tracks.rowid
-      JOIN artists a ON a.id = t.artist_id
-      WHERE fts_tracks MATCH ?
-      GROUP BY a.id
-      ORDER BY a.name COLLATE NOCASE
-      LIMIT ${pageSize} OFFSET ${offset}
-    `;
-
-    function buildArtistFtsMatch(input) {
-      const tokens = String(input)
-        .trim()
-        .toLowerCase()
-        .split(/\s+/)
-        .map((token) => token.replace(/[^0-9a-z]/gi, '').slice(0, 32))
-        .filter((token) => token.length >= 2);
-      if (!tokens.length) return null;
-      return tokens.map((token) => `artist:${token}*`).join(' AND ');
-    }
-
     function updateJumpButtons() {
       jumpButtons.forEach((btn) => {
         const letter = btn.dataset.letter || 'all';
@@ -1514,7 +1482,6 @@
 
     function loadArtistsImmediate() {
       const typedFilter = state.filter.trim();
-      const ftsMatch = buildArtistFtsMatch(typedFilter);
       const likeTerm = buildLikeTerm();
       const useUnfilteredQuery = !typedFilter && !state.prefix;
       listState.showLoading('Loading…');
@@ -1541,83 +1508,46 @@
       ({ pageSize, offset } = initialSanitized);
       let total = 0;
       const rows = [];
-      let usedFts = false;
 
       try {
-        if (ftsMatch) {
-          const ftsCountStmt = prepareForView(
-            db,
-            VIEW_NAMES.browseArtists,
-            applyFtsMatch(ftsCountSql, ftsMatch),
-            'fts-count',
-          );
-          if (ftsCountStmt.step()) total = Number(ftsCountStmt.getAsObject().count) || 0;
-          ftsCountStmt.free();
+        const countStmt = prepareForView(
+          db,
+          VIEW_NAMES.browseArtists,
+          useUnfilteredQuery ? baseCountSql : countSql,
+          useUnfilteredQuery ? 'count' : 'count-filtered',
+        );
+        if (!useUnfilteredQuery) countStmt.bind([likeTerm]);
+        if (countStmt.step()) total = Number(countStmt.getAsObject().count) || 0;
+        countStmt.free();
 
-          if (total > 0) {
-            if (clampPaginationToTotal({
-              state,
-              total,
-              pageSize,
-              view: VIEW_NAMES.browseArtists,
-            })) {
-              ({ page, pageSize, offset } = getNormalizedPagination());
-              const sanitized = sanitizeLimitAndOffset(pageSize, offset);
-              if (!sanitized) return;
-              ({ pageSize, offset } = sanitized);
-            }
-            const ftsRowsStmt = prepareForView(
-              db,
-              VIEW_NAMES.browseArtists,
-              applyFtsMatch(buildFtsRowsSql(pageSize, offset), ftsMatch),
-              'fts-rows',
-            );
-            while (ftsRowsStmt.step()) rows.push(ftsRowsStmt.getAsObject());
-            ftsRowsStmt.free();
-            usedFts = true;
-          }
+        if (total === 0) {
+          table.clear();
+          listState.showEmpty('No artists found');
+          return;
         }
 
-        if (!usedFts) {
-          const countStmt = prepareForView(
-            db,
-            VIEW_NAMES.browseArtists,
-            useUnfilteredQuery ? baseCountSql : countSql,
-            useUnfilteredQuery ? 'count' : 'count-filtered',
-          );
-          if (!useUnfilteredQuery) countStmt.bind([likeTerm]);
-          if (countStmt.step()) total = Number(countStmt.getAsObject().count) || 0;
-          countStmt.free();
-
-          if (total === 0) {
-            table.clear();
-            listState.showEmpty('No artists found');
-            return;
-          }
-
-          if (clampPaginationToTotal({
-            state,
-            total,
-            pageSize,
-            view: VIEW_NAMES.browseArtists,
-          })) {
-            ({ page, pageSize, offset } = getNormalizedPagination());
-            const sanitized = sanitizeLimitAndOffset(pageSize, offset);
-            if (!sanitized) return;
-            ({ pageSize, offset } = sanitized);
-          }
-
-          const rowsStmt = prepareForView(
-            db,
-            VIEW_NAMES.browseArtists,
-            useUnfilteredQuery
-              ? buildBaseRowsSql(pageSize, offset)
-              : buildRowsSql(likeTerm, pageSize, offset),
-            useUnfilteredQuery ? 'rows' : 'rows-filtered',
-          );
-          while (rowsStmt.step()) rows.push(rowsStmt.getAsObject());
-          rowsStmt.free();
+        if (clampPaginationToTotal({
+          state,
+          total,
+          pageSize,
+          view: VIEW_NAMES.browseArtists,
+        })) {
+          ({ page, pageSize, offset } = getNormalizedPagination());
+          const sanitized = sanitizeLimitAndOffset(pageSize, offset);
+          if (!sanitized) return;
+          ({ pageSize, offset } = sanitized);
         }
+
+        const rowsStmt = prepareForView(
+          db,
+          VIEW_NAMES.browseArtists,
+          useUnfilteredQuery
+            ? buildBaseRowsSql(pageSize, offset)
+            : buildRowsSql(likeTerm, pageSize, offset),
+          useUnfilteredQuery ? 'rows' : 'rows-filtered',
+        );
+        while (rowsStmt.step()) rows.push(rowsStmt.getAsObject());
+        rowsStmt.free();
       } catch (err) {
         console.error(err);
         listState.showError('Failed to load artists.');