- /lottosettings now opens settings in private DM instead of group
- Bot only reacts to / commands in groups (keyboard buttons ignored)
- Reply keyboard buttons removed from group messages
- Default display name now uses @username instead of 'Anon'
- Users can still manually update display name in settings
- Updated all display name usages to use centralized getDisplayName()
- Replace Redis/in-memory storage with SQLite for persistence
- Add database.ts service with tables for users, groups, purchases, participants
- Update state.ts and groupState.ts to use SQLite backend
- Fix buyer_name to use display name instead of Telegram ID
- Remove legacy reminder array handlers (now using 3-slot system)
- Add better-sqlite3 dependency, remove ioredis
- Update env.example with BOT_DATABASE_PATH option
- Add data/ directory to .gitignore for database files
