You request a QR code. The server generates it. You wait. That round‑trip latency matters when you are embedding codes in a ...
-- Lines starting with "--" are COMMENTS. SQL ignores them. -- They are just notes for humans reading the code.
shop_app/ ├── main.py ← FastAPI server + ທຸກ API routes ├── database.py ← ການເຊື່ອມຕໍ່ PostgreSQL ├── models.py ...
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