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.serena/memories/song_selection_issue_analysis.md

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+# Song Selection Issue Analysis
+
+## Problem
+- Production: Song selection says it will send to chat but doesn't actually send
+- /start command works fine  
+- No errors in logs
+
+## Code Flow Analysis
+
+### Working /start Command (src/bot.ts:66-95)
+1. User sends /start command
+2. Bot receives via `this.bot.onText(/\/start/)` 
+3. Direct bot.sendMessage() call works
+
+### Broken Song Selection Flow
+1. User selects song in Web App (public/script.ts:248)
+2. Web App calls `this.tg.sendData()` with JSON payload
+3. Should trigger `web_app_data` event in bot (src/bot.ts:159)
+4. Bot should call `sendAudioFile()` method (src/bot.ts:224)
+
+## Key Differences
+- /start: Direct Telegram command → immediate bot response
+- Song selection: Web App → sendData() → web_app_data event → bot response
+
+## Potential Issues
+1. `this.tg.sendData()` might not be working in production environment
+2. `web_app_data` event handler might not be triggered
+3. Web App URL environment variable mismatch
+4. Telegram Web App integration issues in production
+
+## Next Steps
+- Check production environment variables (WEB_APP_URL, TELEGRAM_BOT_TOKEN)
+- Add logging to web_app_data handler
+- Verify Telegram Web App configuration