Architecture notes from building and running production software — boundaries, constraints, Postgres, and the trade-offs behind the decisions.https://octabits.ioen© 2021–2026 DK2 Ventures UG (haftungsbeschränkt)https://octabits.io/blog/one-checkout-two-partieshttps://octabits.io/blog/one-checkout-two-partiesA payment architecture was designed, reviewed and scheduled before a paragraph in our own terms of service made it unbuildable. The constraint was legal, not technical — and the append-only ledger underneath it did not care.Mon, 24 Aug 2026 00:00:00 GMTArchitecturePaymentsCompliancemail@dk2.euhttps://octabits.io/blog/the-graph-is-a-valuehttps://octabits.io/blog/the-graph-is-a-valueTemporal, Inngest, Trigger.dev and DBOS all survive a crash — by three different mechanisms, each charging a different tax. None of them can tell you what a workflow contains before it runs. A declarative DAG can, and that one property is the whole argument.Wed, 19 Aug 2026 00:00:00 GMTArchitectureTypeScriptWorkflowsmail@dk2.eu