ACID & concurrency demos

Rollback

Debit one account, then force a failure. @Transactional rolls the whole operation back — balances are proven unchanged.

Concurrency

Fire N simultaneous transfers between two accounts. The total balance is invariant — no money created or destroyed under contention.

Recent audit log

WhenEntityActionOutcomeDetail
2026-06-27T15:50:53.598753Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****9735 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:53.386907Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****4696 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:53.010342Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****7752 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:52.640123Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****9155 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:52.239504Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****4007 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:52.009183Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****9693 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:51.663106Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****0233 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:51.269684Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****6058 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:50.816936Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****4765 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:50.470889Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****8200 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:50.016505Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****8506 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:49.693867Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****5485 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:48.808128Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****0671 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:48.602971Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****7386 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:47.561441Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****6764 for aa1e90c2-ef31-4845-bdf9-0b73754988c8
2026-06-27T15:50:36.963491Z ACCOUNT CREATE_ACCOUNT SUCCESS Opened CHECKING account for aze
2026-06-27T15:24:49.249690Z ACCOUNT CREATE_ACCOUNT SUCCESS Opened SAVINGS account for reeij
2026-06-27T15:24:18.035897Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****7316 for cac295fe-9045-4ce0-b79e-a6d85cd93f12
2026-06-27T15:24:17.531736Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****4115 for cac295fe-9045-4ce0-b79e-a6d85cd93f12
2026-06-27T15:24:17.099305Z CARD ISSUE_CARD SUCCESS VISA DEBIT ****3995 for cac295fe-9045-4ce0-b79e-a6d85cd93f12