root-at-skic
0745de822a
Six example models next to the three C4 ones: arc42 (Cinema Tickets, IoT Telemetry, Team Wiki) by section, ArchiMate (Insurance Claims, HR Onboarding, Logistics Tracking) by layer, each validated with 0 errors and 0 warnings. resolveRefs and the editor schemas now take ref: in workflow and dataflow nodes, sequence participants and lifecycle states, as the skill already did. Example tests check each framework's folders.
21 lines
838 B
Plaintext
21 lines
838 B
Plaintext
schema_version: 1
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decision:
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id: seat-holds-with-ttl
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title: Seat holds as Redis keys with a TTL
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status: accepted
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date: 2026-09-08
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elements: [booking, seatlock]
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diagrams: [0500-building-blocks/booking.archify, 0600-runtime/book-seats.archify]
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context: >
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A customer may spend minutes at the payment page. Holding seats
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as rows in the database left orphans when a browser closed, and
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a nightly job freed them far too late for Friday shows.
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decision: >
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A hold is one Redis key per seat, set with SET NX and an
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8-minute TTL. The payment webhook turns holds into an order in
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PostgreSQL; an expired key frees the seat without any job.
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consequences: >
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Holds survive no Redis restart; at worst a customer re-picks
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seats. The webhook must check the hold still exists before it
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confirms the order, otherwise it refunds.
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