- Multi-channel subscription enforcement via middleware, events, and cabinet API
- 3-layer cache architecture: Redis -> PostgreSQL -> rate-limited Telegram API
- ChatMemberUpdated event-driven tracking with automatic VPN access control
- Admin management via bot FSM handler and REST API with full CRUD
- Channel ID normalization: @username resolved to numeric ID at creation time
- Fail-closed error handling: API errors deny access (security-first)
- Background reconciliation with keyset pagination (100 per batch)
- Per-user rate limiting on subscription check button (5s cooldown)
- Redis connection pooling via cache singleton (no per-request connections)
- Database: channel_id index, multi-row upsert optimization
- Localization: en, ru, zh, fa, ua translations for all new strings
- Frontend blocking UI with channel list and subscription status
- Admin channel management page with toggle, delete, and create
- Add pyproject.toml with uv and ruff configuration
- Pin Python version to 3.13 via .python-version
- Add Makefile commands: lint, format, fix
- Apply ruff formatting to entire codebase
- Remove unused imports (base64 in yookassa/simple_subscription)
- Update .gitignore for new config files
Fringg