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- Create emoji_mappings table to store emoji->emoji_id mappings - Add EmojiMappingService for managing emoji registration and replacement - Add admin emoji handlers (/add_emoji, /my_emojis, /delete_emoji, /all_emojis) - Create emoji message helper for automatic emoji processing - Add Alembic migration for emoji_mappings table - Integrate emoji router into main dispatcher - Add comprehensive documentation (EMOJI_SYSTEM.md) - Fix migration chain issue with merge_migration Features: - Admins can register premium emojis via /add_emoji command - Automatic emoji->emoji_id replacement before sending messages - Per-admin unique constraint on emoji registration - Track last used timestamp for analytics - Bulk operations support