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Employees can draft and submit GBP expenses; managers can approve or reject submitted requests. The API derives ownership from demo bearer-token identities, prevents self-decisions, and requires an expected version on each write. Spring transactions and JPA
@Versionensure competing edits or decisions produce one commit and one HTTP 409.Flyway uses an explicit migration entry point and schema-owner credential. Runtime validates the schema, uses restricted CRUD privileges, and verifies the Cloud CA and hostname. The README shows visible Cloud setup, role/bootstrap/migration/grants/seed steps, HTTP usage and dedicated-service cleanup. CI checks the Java 21 build and domain tests without Cloud credentials.
Validation on 2 October 2026, native Ubuntu VM, Spring Boot 4.1.1 and Postgres 18.6 in ClickHouse Cloud:
./mvnw -B verify: 4 domain tests passed and packaged jar built../mvnw -B -Pcloud verify: 5 Cloud tests passed, including a barrier-coordinated JPA race, rollback after flush, runtime permission denials, malformed decision rows, and wrong-CA certificate failure with positive connection control.python3 scripts/acceptance.py: validation/forged-owner rejection, cross-user access, status filtering, role and self-decision checks passed. Three edit/submit and three manager-decision races each returned one 200 and one 409. Production jar restart retained the persisted request and version.Bounded demo: GBP only, at most 100 visible rows, no pagination, audit events, payments or token-issuance service. Companion article and private evidence remain outside this PR.