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Transactions in one card
This revision card explains Transactions in one card. It starts from the need that partial multi-item updates leave money and seats inconsistent. It describes transactWriteItems all-or-nothing (limit actions); check CancellationReasons. The how-to section notes list items , then conditions , then txn , then idempotency key , then retry safely. An example on the card is clinic booking for Dr. Anaya uses txn so two patients cannot take one slot.
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What this card says
Why do we need it?
Partial multi-item updates leave money and seats inconsistent.
What is it?
TransactWriteItems all-or-nothing (limit actions); check CancellationReasons.
TransactWriteItems
How to do it
List items → conditions → txn → idempotency key → retry safely.
Example
Clinic booking for Dr. Anaya uses txn so two patients cannot take one slot.