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Payment ledger with partial refunds and date queries
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Build a small payment ledger driven by text commands:
- record a payment with an ID, a UTC timestamp and an amount, rejecting a malformed timestamp or a duplicate ID;
- refund part or all of a payment, any number of times, never more than it was worth in total;
- report net revenue (payments minus refunds);
- list the IDs of payments made on a given date, or between two dates, in the order they were recorded, rejecting malformed dates.
Return one result for each command. A fully refunded payment still shows up in date queries. Think about how to index payments by date so the queries don't scan everything.
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