Base de Dados — Firestore

🔐 Users

users/ userId/ email: string username: string themeMode: "system" | "light" | "dark" primaryColor: string (hex) language: "pt" | "en" favoriteGenres: [string] createdAt: timestamp

🎵 Songs

songs/ songId/ title: string artist: string url: string coverUrl: string userId: string genre: string mood: string duration: number createdAt: timestamp

📂 Playlists

playlists/ playlistId/ name: string userId: string songs: [songId] createdAt: timestamp

💬 Chats

chats/ chatId/ participants: [userId] lastMessage: string updatedAt: timestamp

📨 Messages

messages/ messageId/ chatId: string senderId: string text: string (optional) songId: string (optional) timestamp: timestamp

⚡ Regras importantes

Nunca duplicar dados desnecessários
Usar IDs para relações
Otimizar leituras (Firestore billing)

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