lidify/docs/implementation-summaries/spotify-ui-overhaul/MODIFIED_FILES.md

Modified Files for Review

Last Updated: December 16, 2025
Features: Spotify Import + UI Overhaul (Activity Panel, Carousels, Notifications, Playlist/Mix/Discover Redesign, Settings Page Redesign)

Overview

This document tracks all files created or modified as part of:

1. Spotify Import Feature - Import Spotify playlists, match tracks, download albums
2. UI Overhaul - Activity Panel, horizontal carousels, notification system

---

Backend - New Files

File	Purpose
backend/src/services/notificationService.ts	Notification CRUD service with convenience methods
backend/src/services/spotifyImport.ts	Spotify playlist import logic, track matching, album resolution
backend/src/services/spotify.ts	Spotify API/scraping service (embed data extraction)
backend/src/routes/notifications.ts	Notification & download history API endpoints
backend/src/routes/spotify.ts	Spotify import API endpoints
backend/src/utils/playlistLogger.ts	Debug logger for Spotify import jobs

Backend - Modified Files

File	Changes
backend/prisma/schema.prisma	Added Notification model, DownloadJob.cleared field
backend/src/services/simpleDownloadManager.ts	Added notification integration, failure deduplication
backend/src/services/lidarr.ts	Smart anyReleaseOk fallback, MusicBrainz fallback for artist lookup
backend/src/services/musicbrainz.ts	Recording filtering, scoring system, title normalization
backend/src/services/spotify.ts	Embed scraping improvements, debug logging
backend/src/index.ts	Registered notification routes

---

Frontend - New Files

File	Purpose
frontend/components/layout/ActivityPanel.tsx	Collapsible 3rd column with tabs, PWA install button
frontend/components/activity/NotificationsTab.tsx	System notifications list
frontend/components/activity/ActiveDownloadsTab.tsx	Currently downloading items
frontend/components/activity/HistoryTab.tsx	Completed/failed with retry
frontend/components/ui/HorizontalCarousel.tsx	Reusable carousel with arrows
frontend/hooks/useActivityPanel.ts	Panel state management
frontend/app/import/spotify/page.tsx	Spotify import UI page (preview, selection, progress)

Frontend - Modified Files

File	Changes
frontend/components/layout/AuthenticatedLayout.tsx	Added 3rd column, event listener for toggle
frontend/components/layout/TopBar.tsx	Added ActivityPanelToggle button
frontend/components/MixCard.tsx	Reduced padding/sizing (p-4 → p-2.5)
frontend/features/home/components/ArtistsGrid.tsx	Uses HorizontalCarousel
frontend/features/home/components/MixesGrid.tsx	Uses HorizontalCarousel
frontend/features/home/components/ContinueListening.tsx	Uses HorizontalCarousel
frontend/features/home/components/PodcastsGrid.tsx	Uses HorizontalCarousel
frontend/features/home/components/HomeHero.tsx	Already optimized (compact greeting)
frontend/lib/api.ts	Added notification API methods, Spotify import methods
frontend/app/playlists/page.tsx	Added "Import from Spotify" button/link
frontend/app/playlist/[id]/page.tsx	Full Spotify-style redesign (see below)
frontend/app/mix/[id]/page.tsx	Full Spotify-style redesign (matches playlist page)
frontend/app/discover/page.tsx	Updated to use consistent container widths
frontend/features/discover/components/DiscoverHero.tsx	Redesigned to match playlist/mix hero style
frontend/features/discover/components/DiscoverActionBar.tsx	Redesigned with Lidify yellow play button
frontend/features/discover/components/TrackList.tsx	Redesigned to match playlist/mix track listing
frontend/components/layout/Sidebar.tsx	Removed unused icon imports

---

Database Changes

// NEW MODEL
model Notification {
  id        String   @id @default(cuid())
  userId    String
  type      String   // system, download_complete, playlist_ready, error, import_complete
  title     String
  message   String?
  metadata  Json?    // { playlistId, albumId, artistId, etc. }
  read      Boolean  @default(false)
  cleared   Boolean  @default(false)
  createdAt DateTime @default(now())

  user User @relation(fields: [userId], references: [id], onDelete: Cascade)

  @@index([userId, cleared])
  @@index([userId, read])
  @@index([createdAt])
}

// MODIFIED MODEL - DownloadJob
model DownloadJob {
  // ... existing fields ...
  cleared   Boolean @default(false)  // NEW: User dismissed from history
}

Migration Applied: npx prisma db push

---

API Endpoints

Notifications (/api/notifications)

Method	Endpoint	Description
GET	/notifications	List uncleared notifications
GET	/notifications/unread-count	Get unread count
POST	/notifications/:id/read	Mark as read
POST	/notifications/read-all	Mark all as read
POST	/notifications/:id/clear	Clear (dismiss) notification
POST	/notifications/clear-all	Clear all notifications
GET	/notifications/downloads/active	Active downloads
GET	/notifications/downloads/history	Completed/failed downloads
POST	/notifications/downloads/:id/clear	Clear from history
POST	/notifications/downloads/clear-all	Clear all history
POST	/notifications/downloads/:id/retry	Retry failed download

Spotify Import (/api/spotify)

Method	Endpoint	Description
POST	/spotify/import/preview	Generate import preview from URL
POST	/spotify/import/start	Start import with selections
GET	/spotify/import/:id/status	Get import job status

---

Key Bug Fixes

1. Track Matching (Spotify Import)

• File: backend/src/services/spotifyImport.ts
• Fix: Added stripTrackSuffix() to remove "- 2011 Remaster" etc. while keeping punctuation
• Fix: Added Unicode normalization for artist names (Röyksopp → Royksopp)
• Fix: Multiple matching strategies (exact → stripped → fuzzy)

2. MusicBrainz Album Resolution

• File: backend/src/services/musicbrainz.ts
• Fix: Score threshold > 50 for studio albums
• Fix: Recording filtering (exclude live/demo/acoustic)
• Fix: Soundtrack penalty in scoring

3. Lidarr Album Addition

• File: backend/src/services/lidarr.ts
• Fix: Smart anyReleaseOk fallback (try strict first, then loosen)
• Fix: MusicBrainz fallback when Lidarr's metadata server fails
• Fix: Immediate error when no releases found

4. Multiple Failure Notifications

• File: backend/src/services/simpleDownloadManager.ts
• Fix: 30-second deduplication window for failure events
• Fix: Only notify on final exhaustion, not each retry
• Fix: Skip notifications for discovery/import batches

---

Testing Checklist

Activity Panel

• Panel opens/closes from TopBar button
• Panel state persists in localStorage
• Notifications tab shows system messages
• Active tab shows downloading items (refreshes every 5s)
• History tab shows completed/failed
• Retry button works for failed downloads
• Clear buttons work

Home Page Carousels

• Horizontal scroll works
• Arrow buttons appear on hover (desktop)
• Snap behavior works
• Card sizing is compact

Spotify Import

• Preview generation works
• Album selection works
• Downloads start correctly
• Track matching works after downloads
• Playlist is created with matched tracks
• Notification appears when complete

Notifications

• Download complete creates notification
• Download failed creates notification (only on exhaustion)
• Spotify import complete creates notification
• Unread badge shows count
• Mark as read works
• Clear works

Playlist Page

• Hero section is compact with bottom-aligned content
• Shuffle button randomizes and plays tracks
• Track listing spans full width (no container)
• Currently playing track is highlighted
• Track numbers become play icons on hover
• Album column hidden on mobile

PWA Install

• "Install App" button appears in Activity Panel (when installable)
• Button triggers browser install prompt
• Button disappears after installation

---

Rollback Instructions

If issues arise, revert these files:

# Core files to revert for UI changes
git checkout HEAD~1 -- frontend/components/layout/AuthenticatedLayout.tsx
git checkout HEAD~1 -- frontend/components/layout/TopBar.tsx
git checkout HEAD~1 -- frontend/components/layout/ActivityPanel.tsx
git checkout HEAD~1 -- frontend/components/activity/

# For Spotify import issues
git checkout HEAD~1 -- backend/src/services/spotifyImport.ts
git checkout HEAD~1 -- backend/src/services/musicbrainz.ts
git checkout HEAD~1 -- backend/src/services/lidarr.ts

# Database rollback (if needed)
# Remove Notification model and DownloadJob.cleared from schema
npx prisma db push

---

Notes

• The old DownloadNotifications.tsx (floating modal) still exists but is no longer imported in the layout
• All grid components were already converted to carousels prior to this session
• The Spotify import flow uses lidarrService.addAlbum() directly instead of simpleDownloadManager to avoid same-artist fallback

Playlist Page Redesign

File: frontend/app/playlist/[id]/page.tsx

Changes Made

1. Fixed React Hooks Error - Moved totalDuration useMemo before early returns
2. Full-Width Track Listing - Removed container wrapper, tracks span full panel width like Spotify
3. Compact Hero Section - Smaller cover art (140px/192px), bottom-aligned content, reduced title size
4. Added Shuffle Button - Shuffles and plays all tracks in random order
5. Grid-Based Track Layout - Columns: #, Title/Artist, Album, Duration (responsive)
6. Track Hover States - Number becomes play icon on hover, row highlights

PWA Install in Activity Panel

File: frontend/components/layout/ActivityPanel.tsx

• Added beforeinstallprompt event listener
• "Install App" button appears at bottom of panel when PWA can be installed
• Hides automatically when app is already installed or running in standalone mode

Sidebar Cleanup

File: frontend/components/layout/Sidebar.tsx

• Removed unused icon imports (Home, Library, Sparkles, Book, Mic2)
• Navigation items use text-only (no icons) - matching minimalist design

Playlists Page Redesign

File: frontend/app/playlists/page.tsx

Before → After:

Element	Before	After
Header title	text-3xl md:text-4xl font-black	text-2xl font-bold
Header padding	px-6 md:px-8 py-6 md:py-8	px-6 pt-6 pb-4
Gradient overlay	Yellow gradient at top	Removed
Import button	Green outline with icon	Solid green bg-[#1DB954], no icon
Hidden toggle	Icon + text, bordered	Text only, minimal style
Card wrapper	<Card> component	Simple <div> with hover:bg-white/5
Card padding	p-4 (via Card)	p-3
Play button	w-12 h-12	w-10 h-10
Empty state	<EmptyState> with icons	Simple centered div
Shared badge	Purple badge	Shown in subtitle instead
Track count	"tracks"	"songs" (matches Spotify)

Design Philosophy:

• Remove decorative icons where text suffices
• Reduce spacing for tighter, professional feel
• Use native hover states instead of custom components
• Minimal color - let content speak
• Match Spotify's terminology

---

Spotify-Style Design Patterns

Use these patterns consistently across all pages for a cohesive look.

1. Hero Sections (Albums, Playlists, Artists)

- Compact height (max ~180px for cover on desktop)
- Content bottom-aligned to the cover art
- Title: text-2xl md:text-3xl font-bold (NOT text-4xl+)
- Subtitle info: text-sm text-gray-400
- Reduced vertical spacing (gap-2 to gap-4 max)
- No decorative gradients overlaying the hero

2. Track Listings

- Full-width, no container card wrapping
- Grid layout: [#] [Title/Artist] [Album] [Duration]
- Album column: hidden on mobile (md:grid-cols-[16px_1fr_1fr_60px])
- Hover: row bg-white/5, number → play icon
- Playing indicator: Lidify yellow (#ecb200) on track number
- Compact row height (~56px)

3. Page Headers

- Title: text-2xl font-bold (not text-3xl+)
- Subtitle: text-sm text-gray-400
- Actions: rounded-full buttons with minimal icons
- No excessive padding (px-6 py-4 is enough)

4. Cards (Albums, Artists, Playlists)

- Compact padding: p-2.5 (not p-4)
- Title: text-sm font-medium truncate
- Subtitle: text-xs text-gray-500
- Play button: bottom-right, shows on hover

5. Grids → Carousels

- Use HorizontalCarousel for content rows
- Single horizontal line, scroll/swipe
- Arrow buttons on hover (desktop)
- Snap behavior for smooth scrolling

6. General Typography

- Section headers: text-lg font-semibold (not text-xl)
- Greeting (home): text-2xl md:text-3xl font-bold tracking-tight
- No ALL CAPS unless absolutely necessary
- Muted subtitles: text-gray-400 or text-gray-500

7. Buttons & Actions

- Primary action: rounded-full, bg-[#ecb200] text-black
- Secondary: bg-white/10 hover:bg-white/20
- Icon-only buttons: rounded-full p-2
- Minimal icon usage - text labels preferred

8. Spacing Philosophy

- Tight but breathable
- Section gaps: gap-6 (not gap-8 or gap-10)
- Card grids: gap-4
- Hero to content: pt-6 (not pt-10)

---

Post-Implementation Fixes

Date	File	Issue	Fix
2025-12-15	backend/src/routes/notifications.ts	Wrong import path ../db	Changed to ../utils/db
2025-12-15	frontend/app/playlist/[id]/page.tsx	React hooks order violation	Moved useMemo before early returns
2025-12-15	frontend/app/playlist/[id]/page.tsx	useAuth not defined	Removed unused isAuthenticated
2025-12-15	frontend/components/layout/ActivityPanel.tsx	Badge not clearing after clear all	Added notifications-changed event listener
2025-12-15	frontend/components/activity/NotificationsTab.tsx	Badge not updating	Dispatch notifications-changed event on mutations
2025-12-15	backend/src/services/spotifyImport.ts	Track matching failing (apostrophes, artist matching)	Added normalizeApostrophes(), changed artist match to use contains with first word
2025-12-15	frontend/app/playlists/page.tsx	Page design not matching Spotify style	Full redesign: compact header, cleaner cards, minimal icons, refined typography
2025-12-15	frontend/app/import/spotify/page.tsx	Using Music2 icon instead of Spotify logo	Uses SpotIcon.png, cleaner layout, matches style guide, removed heavy Card components
2025-12-15	frontend/app/import/spotify/page.tsx	Grey/transparent gradient not matching brand	Added yellow-to-purple gradient (same as home page) with quick fade ratio (35vh/25vh)
2025-12-15	frontend/app/discover/page.tsx	Container width inconsistent with hero	Added max-w-7xl mx-auto to track listing section
2025-12-15	frontend/app/mix/[id]/page.tsx	Container width inconsistent with hero	Added max-w-7xl mx-auto to track listing section
2025-12-15	frontend/app/playlist/[id]/page.tsx	Container width inconsistent with hero	Added max-w-7xl mx-auto to track listing section
2025-12-15	frontend/features/discover/components/*	Discover page not matching playlist/mix design	Redesigned DiscoverHero, DiscoverActionBar, TrackList to match Spotify style
2025-12-15	frontend/app/library/page.tsx	Container width not matching other pages	Removed max-w-7xl mx-auto, now full-width with px-4 md:px-8
2025-12-15	frontend/features/library/components/LibraryHeader.tsx	Container width not matching other pages	Removed max-w-7xl mx-auto, now full-width with px-4 md:px-8
2025-12-15	frontend/app/podcasts/page.tsx	Container width + card styling not matching	Removed max-w-7xl mx-auto, cleaner cards without borders/gradients
2025-12-15	frontend/app/audiobooks/page.tsx	Container width not matching other pages	Removed max-w-7xl mx-auto, smaller header text, consistent with Spotify style
2025-12-15	frontend/app/artist/[id]/page.tsx	Container width not matching other pages	Removed max-w-7xl mx-auto, now full-width with px-4 md:px-8
2025-12-15	frontend/app/album/[id]/page.tsx	Container width not matching other pages	Removed max-w-7xl mx-auto, now full-width with px-4 md:px-8
2025-12-15	frontend/features/artist/components/ArtistHero.tsx	Hero not matching Spotify style	Compact hero, full-width, bottom-aligned content, kept VibrantJS gradients
2025-12-15	frontend/features/artist/components/ArtistActionBar.tsx	Action bar too heavy	Simplified to play button + shuffle + download, matching playlist style
2025-12-15	frontend/features/artist/components/PopularTracks.tsx	Track list not matching new style	Removed Card wrapper, grid-based layout, cleaner typography
2025-12-15	frontend/features/artist/components/Discography.tsx	Section header too large	Changed header from text-2xl md:text-3xl to text-xl
2025-12-15	frontend/features/artist/components/AvailableAlbums.tsx	Section headers too large	Changed headers to text-xl font-bold mb-4, renamed sections
2025-12-15	frontend/features/artist/components/SimilarArtists.tsx	Cards not matching new style	Cleaner cards with transparent bg, smaller header
2025-12-15	frontend/features/artist/components/ArtistBio.tsx	Using Card component	Replaced Card with simple bg-white/5 div
2025-12-15	frontend/features/album/components/AlbumHero.tsx	Hero not matching Spotify style	Compact hero, full-width, bottom-aligned content, kept VibrantJS gradients
2025-12-15	frontend/features/album/components/AlbumActionBar.tsx	Action bar too heavy	Simplified to play + shuffle + add to playlist, matching playlist style
2025-12-15	frontend/features/album/components/SimilarAlbums.tsx	Section header too large	Changed header to text-xl font-bold mb-4
2025-12-15	frontend/app/artist/[id]/page.tsx	Artist bio/about not showing	Now uses artist.bio || artist.summary for library artists with summary field
2025-12-15	frontend/features/artist/components/ArtistBio.tsx	Read more link not brand color	Added [&_a]:text-[#ecb200] for Lidify yellow links
2025-12-15	frontend/app/audiobooks/[id]/page.tsx	Page design not matching Spotify style	Compact hero, yellow play button, integrated action bar, full-width layout
2025-12-15	frontend/features/audiobook/components/AudiobookHero.tsx	Hero too large and dated	Compact Spotify-style hero with bottom-aligned content, VibrantJS gradients preserved
2025-12-15	frontend/features/audiobook/components/AudiobookActionBar.tsx	Action bar not matching other pages	Yellow play button, inline progress, subtle action icons
2025-12-15	frontend/app/podcasts/[id]/page.tsx	Page design not matching Spotify style	Compact hero, fixed height gradient (25vh), full-width layout
2025-12-15	frontend/features/podcast/components/PodcastHero.tsx	Hero too large and dated	Compact Spotify-style hero with bottom-aligned content, VibrantJS gradients preserved
2025-12-15	frontend/features/podcast/components/PodcastActionBar.tsx	Action bar too heavy	Yellow subscribe button, subtle RSS link, cleaner remove confirmation
2025-12-15	frontend/features/podcast/components/ContinueListening.tsx	Cards not matching new style	Yellow play button, cleaner progress bar, simpler prev/next episodes
2025-12-15	frontend/features/podcast/components/EpisodeList.tsx	Episode list not matching new style	Removed Card wrapper, yellow highlights, cleaner typography
2025-12-15	frontend/features/podcast/components/SimilarPodcasts.tsx	Cards not matching new style	Transparent bg with hover, smaller header, cleaner layout
2025-12-15	frontend/features/podcast/components/PreviewEpisodes.tsx	Cards not matching new style	Removed Card wrappers, yellow subscribe button, cleaner About section

---

Settings Page Redesign (December 16, 2025)

Overview

Complete redesign of the settings page to match Spotify's clean, minimal aesthetic with:

• Sidebar navigation - Fixed sidebar with section links, active state tracking via intersection observer
• Single scrollable page - All sections on one page instead of tabs
• Unified Spotify section - Combined OAuth user connection + Developer API credentials
• Spotify-style design patterns - Row-based layouts, clean toggles, minimal borders

Database Changes

model User {
  // ... existing fields ...

  // NEW: Spotify OAuth connection
  spotifyAccessToken   String?   // Encrypted OAuth access token
  spotifyRefreshToken  String?   // Encrypted OAuth refresh token
  spotifyTokenExpiry   DateTime? // When access token expires
  spotifyUserId        String?   // Spotify user ID
  spotifyDisplayName   String?   // Display name from Spotify
}

New API Endpoints

Method	Endpoint	Description
GET	/api/spotify/auth/url	Generate OAuth authorization URL
GET	/api/spotify/auth/callback	Handle OAuth callback, store tokens
POST	/api/spotify/auth/disconnect	Remove user's Spotify connection
GET	/api/spotify/auth/status	Check if user is connected

New Frontend Files

File	Purpose
frontend/features/settings/components/ui/SettingsLayout.tsx	Sidebar + main content wrapper
frontend/features/settings/components/ui/SettingsSidebar.tsx	Navigation sidebar with section links
frontend/features/settings/components/ui/SettingsSection.tsx	Section header with separator
frontend/features/settings/components/ui/SettingsRow.tsx	Label + description left, control right
frontend/features/settings/components/ui/SettingsToggle.tsx	Spotify-style toggle switch
frontend/features/settings/components/ui/SettingsSelect.tsx	Dropdown select
frontend/features/settings/components/ui/SettingsInput.tsx	Text/password input with show/hide
frontend/features/settings/components/ui/ConnectionCard.tsx	OAuth connection card (Spotify)
frontend/features/settings/components/ui/index.ts	Barrel export
frontend/features/settings/components/sections/AccountSection.tsx	Password change + 2FA
frontend/features/settings/components/sections/PlaybackSection.tsx	Streaming quality dropdown
frontend/features/settings/components/sections/SpotifyConnectionSection.tsx	Spotify OAuth connection
frontend/features/settings/components/sections/SpotifyAPISection.tsx	Developer API credentials
frontend/features/settings/components/sections/CacheSection.tsx	Cache sizes + automation toggles
frontend/features/settings/hooks/useSpotifyOAuth.ts	OAuth state management

Modified Frontend Files

File	Changes
frontend/app/settings/page.tsx	Complete redesign with sidebar layout
frontend/features/settings/components/sections/LidarrSection.tsx	Spotify-style row layout
frontend/features/settings/components/sections/AudiobookshelfSection.tsx	Spotify-style row layout
frontend/features/settings/components/sections/SoulseekSection.tsx	Spotify-style row layout
frontend/features/settings/components/sections/AIServicesSection.tsx	Spotify-style row layout
frontend/features/settings/components/sections/StoragePathsSection.tsx	Spotify-style row layout
frontend/features/settings/components/sections/UserManagementSection.tsx	Cleaner design, modal for delete

Modified Backend Files

File	Changes
backend/prisma/schema.prisma	Added Spotify OAuth fields to User model
backend/src/routes/spotify.ts	Added OAuth routes

Deleted Files (Consolidated)

File	Reason
frontend/features/settings/components/UserSettingsTab.tsx	Replaced by unified settings page
frontend/features/settings/components/AccountTab.tsx	Replaced by unified settings page
frontend/features/settings/components/SystemSettingsTab.tsx	Replaced by unified settings page
frontend/features/settings/components/sections/ChangePasswordSection.tsx	Merged into AccountSection
frontend/features/settings/components/sections/TwoFactorAuthSection.tsx	Merged into AccountSection
frontend/features/settings/components/sections/PlaybackQualitySection.tsx	Replaced by PlaybackSection
frontend/features/settings/components/sections/AdvancedSettingsSection.tsx	Replaced by CacheSection
frontend/features/settings/components/sections/CacheSettingsSection.tsx	Replaced by CacheSection
frontend/features/settings/components/sections/SpotifySection.tsx	Split into Connection + API

Settings Sections

All Users: Account, Playback, Connected Services (Spotify OAuth)

Admin Only: Download Services, Media Servers, P2P Networks, AI Services, Spotify API, Storage, Cache & Automation, User Management

---

Home Page Enhancements (Dec 16, 2025)

New Features

1. Radio Stations Section - Compact horizontal row at the top of the home page showing random Deezer radio stations
2. Featured Playlists Section - Grid showing 10 featured Deezer playlists after Popular Artists section

New Files Created

File	Purpose
frontend/features/home/components/FeaturedPlaylistsGrid.tsx	Grid component for featured playlists
frontend/features/home/components/RadioStationsGrid.tsx	Horizontal scroll component for radio stations

Modified Files

File	Changes
frontend/app/page.tsx	Added radio stations and featured playlists sections
frontend/features/home/hooks/useHomeData.ts	Added browse data fetching for playlists/radios
frontend/hooks/useQueries.ts	Added browse query keys and hooks
backend/src/routes/browse.ts	Increased featured playlists limit from 50 to 200

---

Notification & Sync Button Improvements (Dec 16, 2025)

Changes

1. Sync Button - No longer shows toast overlay, turns green with spinning animation while syncing
2. Optimistic Notification Clearing - Notifications are cleared from UI immediately before API call completes
3. Duplicate Key Fix - Added context parameter to renderCard in browse page to prevent duplicate key errors

Modified Files

File	Changes
frontend/components/layout/Sidebar.tsx	Removed toast, added green color while syncing
frontend/components/activity/NotificationsTab.tsx	Implemented optimistic updates for all mutations
frontend/app/browse/playlists/page.tsx	Fixed duplicate key errors with unique keys

---

Essentia Audio Analysis Integration (Dec 16, 2025)

Overview

Integrated Essentia audio analysis to extract BPM, key, mood, energy, and other audio features from tracks. This enables intelligent mood-based mixes and personalized playlists.

Database Changes

Added to Track model in backend/prisma/schema.prisma:

Field	Type	Description
bpm	Float?	Beats per minute
beatsCount	Int?	Total beats in track
key	String?	Musical key (C, F#, Bb, etc.)
keyScale	String?	"major" or "minor"
keyStrength	Float?	Key detection confidence (0-1)
energy	Float?	Overall energy (0-1)
loudness	Float?	Average loudness in dB
dynamicRange	Float?	Dynamic range in dB
danceability	Float?	Danceability score (0-1)
valence	Float?	Happy (1) to sad (0)
arousal	Float?	Energetic (1) to calm (0)
instrumentalness	Float?	Vocal presence (0-1, 1=instrumental)
acousticness	Float?	Acoustic vs electronic (0-1)
speechiness	Float?	Spoken word content (0-1)
moodTags	String[]	ML-classified mood tags
essentiaGenres	String[]	ML-classified genres
lastfmTags	String[]	User-generated mood tags from Last.fm
analysisStatus	String	pending/processing/completed/failed
analysisVersion	String?	Essentia version used
analyzedAt	DateTime?	When analysis was completed
analysisError	String?	Error message if failed

New Files

File	Description
services/audio-analyzer/Dockerfile	Python 3.11 + Essentia container
services/audio-analyzer/analyzer.py	Main audio analysis service
services/audio-analyzer/requirements.txt	Python dependencies
backend/src/workers/trackEnrichment.ts	Last.fm tag enrichment worker
backend/src/routes/analysis.ts	API routes for analysis status & triggers

Modified Files

File	Changes
backend/prisma/schema.prisma	Added audio analysis fields to Track model
backend/src/workers/index.ts	Added track enrichment worker startup/shutdown
backend/src/workers/queues.ts	Added analysisQueue for audio analysis jobs
backend/src/index.ts	Registered /api/analysis routes
backend/src/services/programmaticPlaylists.ts	Added mood-based mix generators
backend/src/routes/library.ts	Added mood-based radio station filtering
frontend/features/home/components/LibraryRadioStations.tsx	Added mood-based radio station buttons
docker-compose.yml	Added audio-analyzer service (optional)

New Mix Types (Audio Analysis-Based)

Mix Type	Criteria
High Energy	energy >= 0.7, BPM >= 120
Late Night	energy <= 0.4, BPM <= 90, low arousal
Happy Vibes	valence >= 0.6, energy >= 0.5
Melancholy	valence <= 0.4, minor key preferred
Dance Floor	danceability >= 0.7, BPM 110-140
Acoustic	acousticness >= 0.6, energy 0.3-0.6
Instrumental	instrumentalness >= 0.7, energy 0.3-0.6
Road Trip	tags or energy 0.5-0.8, BPM 100-130
Sunday Morning	low energy, high acousticness (day-specific)
Monday Motivation	high energy, high valence (day-specific)
Friday Night	high danceability, high energy (day-specific)

API Endpoints

Method	Endpoint	Description
GET	/api/analysis/status	Get analysis progress statistics
POST	/api/analysis/start	Queue pending tracks for analysis
POST	/api/analysis/retry-failed	Reset failed tracks to pending
POST	/api/analysis/analyze/:id	Queue specific track for analysis
GET	/api/analysis/track/:id	Get analysis data for specific track
GET	/api/analysis/features	Get aggregated feature statistics

Starting the Audio Analyzer

The audio analyzer is disabled by default. To enable it:

docker-compose --profile audio-analysis up -d

Or just run it separately:

docker-compose up audio-analyzer -d

---

Notification System Fixes (Dec 16, 2025)

Issues Fixed

1. Toast overlays for cache clearing and sync - Removed toast.success overlays for "Caches cleared" and "Library scan started" since these should appear in the activity panel notification bar instead.

2. Notification badge not clearing immediately - The useNotifications hook wasn't responding to notifications-changed events. Fixed by adding an event listener that triggers a refetch.

3. Settings page glitchy sidebar - Replaced IntersectionObserver with scroll-based tracking for smoother sidebar highlighting.

Modified Files

File	Change
frontend/hooks/useNotifications.ts	Added event listener for notifications-changed to trigger immediate refetch
frontend/features/settings/components/sections/CacheSection.tsx	Removed toast.success for cache clearing and sync, added local error state
frontend/components/layout/TopBar.tsx	Removed toast.success for library scan started
frontend/components/layout/Sidebar.tsx	Added notifications-changed event dispatch after sync
frontend/features/settings/components/ui/SettingsLayout.tsx	Replaced IntersectionObserver with throttled scroll listener for smoother sidebar tracking

Behavior Changes

• Sync button: No longer shows toast overlay - progress appears in activity panel
• Clear caches button: No longer shows toast overlay - implicit success (button returns to normal state)
• Notification badge: Now clears immediately via optimistic updates and event system
• Settings sidebar: Smoother scrolling behavior without jumpy highlights

---

Session 8: Artist Radio Feature

New Feature: Artist Radio with Hybrid Similarity Matching

File	Change
backend/src/routes/library.ts	Added artist case to /library/radio endpoint with hybrid matching
backend/src/routes/library.ts	Added artist name filtering to /library/genres endpoint
frontend/features/artist/components/ArtistActionBar.tsx	Added Radio icon button for library artists
frontend/app/artist/[id]/page.tsx	Added handleStartRadio function and passed to ArtistActionBar
frontend/lib/api.ts	Added getRadioTracks() method

Artist Radio Logic

The artist radio uses a hybrid approach with vibe boosting:

1. Last.fm Similar Artists (filtered to library): Primary source, gets up to 15 similar artists that exist in user's library
2. Genre Matching Fallback: If < 5 similar artists, finds library artists with overlapping genres
3. Vibe Boost via Audio Analysis: Scores similar artists' tracks by BPM, energy, valence, and danceability similarity
4. Track Mix: ~40% from original artist, ~60% from vibe-matched similar artists

Genre Filtering Fix

Artist names (like "Jamiroquai") were incorrectly showing as genres. Fixed by:

• Fetching all artist names at query time
• Filtering out any "genre" that matches an artist name (case-insensitive)

Bug Fix: Artist Radio "Unknown Artist" / No Image

Fixed two issues with artist radio playback:

1. Frontend: Removed double-transformation of tracks - backend already returns properly formatted data
2. Backend: Fixed coverArt to use track.album.coverUrl directly instead of conditional lidarrAlbumId check

---

Session 9: Vibe Match Feature

New Feature: "Vibe Match" Button on Media Player

Allows users to instantly create a queue of tracks that sound like the currently playing track.

File	Change
backend/src/routes/library.ts	Added vibe case to /library/radio endpoint with audio feature matching
frontend/components/player/MiniPlayer.tsx	Added Vibe button (AudioWaveform icon) with loading state
frontend/components/player/FullPlayer.tsx	Added Vibe button (AudioWaveform icon) with loading state

How Vibe Match Works

1. Takes current track's audio features (BPM, energy, valence, danceability, key, mood tags)
2. Searches entire library for tracks with similar audio profiles
3. Scores matches using weighted algorithm:
   • BPM (25%) - within ±15 BPM is ideal
   • Energy (25%)
   • Valence/mood (20%)
   • Danceability (15%)
   • Key compatibility (10%)
   • Mood tag overlap (5%)
4. Falls back gracefully if not enough audio matches:
   • Same artist's other tracks
   • Last.fm similar artists' tracks
   • Same genre tracks
   • Random library tracks

UI Location

The Vibe button (waveform icon) appears after the Repeat button in both:

• MiniPlayer (sidebar player)
• FullPlayer (bottom bar player)

Clicking it replaces the current queue with vibe-matched tracks and shows a toast notification.

---

Session 9 (continued): Search Tracks Fix

Bug Fix: Library Tracks Not Showing in Search

The backend was returning tracks in search results, but the frontend never displayed them.

File	Change
frontend/app/search/page.tsx	Added import for LibraryTracksList and section to display library tracks
frontend/features/search/components/LibraryTracksList.tsx	New file - Component to display library tracks in search results

Features of LibraryTracksList

• Shows up to 10 tracks matching the search query
• Displays cover art, title, artist, album, and duration
• Click to play (integrates with audio context)
• Currently playing track highlighted in yellow
• Artist and album names link to their respective pages