Why cross-database transfers aren't atomic: multi-phase transactions and frontend reconciliation
benkuhn · x · 2026-08-27
Ben Kuhn discusses atomicity in distributed account transfers: when accounts live in different backend databases, transfers are often non-atomic, and double spending must be prevented via multi-phase transactions, similar to credit card auth/capture. He adds that this approach requires clever frontend reconciliation to avoid flashing an incorrect balance somewhere in the UI.
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