Andrey Smakotin eac778b06d Add Redis-based persistence for POS cart and customer selection ...

Implemented Redis caching with 2-hour TTL for POS session data:

Backend changes:
- Added Redis cache configuration in settings.py
- Created save_cart() endpoint to persist cart state
- Added cart and customer loading from Redis in pos_terminal()
- Validates cart items (products/kits) still exist in DB
- Added REDIS_HOST, REDIS_PORT, REDIS_DB to .env

Frontend changes:
- Added saveCartToRedis() with 500ms debounce
- Cart auto-saves on add/remove/quantity change
- Added cart initialization from Redis on page load
- Enhanced customer button with two-line display and reset button
- Red X button appears only for non-system customers

Features:
- Cart persists across page reloads (2 hour TTL)
- Customer selection persists (2 hour TTL)
- Independent cart per user+warehouse combination
- Automatic cleanup of deleted items
- Debounced saves to reduce server load

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-20 09:55:03 +03:00

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