fix(etl): reject invalid amounts before persistence

[seonghobae]

Purpose

Fix #198 test-first from protected develop@622e5e6c3d534f230c390f10e3832efadfc01825. The protected ETL transformation historically mapped malformed, blank, excessive-precision, and unsupported-scale AMOUNT input to valid-looking 0.00, making bad upstream data indistinguishable from a genuine zero after persistence.

This direct-develop Draft now contains the complete bounded RED → GREEN behavior repair plus source-backed documentation alignment. It does not add a database migration, new public error field, raw-value logging, dependency change, or broad ETL refactor.

Exact current identity

• protected/live base: develop@622e5e6c3d534f230c390f10e3832efadfc01825;
• branch: fix/reject-invalid-amount-622e5e6;
• fail-first source head: 1b89e62d5f8b30c6dceb0d39f538d283238e7a8a;
• exact current source head: 27707b72ba1865fe86e24dfbecdc740a586a258b;
• current synthetic merge preview: f2d5e2042873b31047afda21b7bfb385e9794c4b;
• Draft: true;
• GitHub mergeability: true;
• formal reviews: none;
• unresolved review threads: zero.

Every check/review from a predecessor head or base is historical and does not transfer.

RED — invalid amounts were accepted and rewritten

Fail-first 1b89e62d5f8b30c6dceb0d39f538d283238e7a8a added EtlServiceAmountIntegrityTest before production changed. It reaches EtlService.processData(...) with malformed, blank, excessive-precision and unsupported-scale values and requires EtlRequestError.INVALID_RECORD before JDBC; it also requires one bad amount in a multi-record request to reject the entire prevalidated batch before the first write.

Hosted CI 31348838751, macOS job 93335761349, checked out synthetic merge e292fcd38b3f6af5d2efe9b332cc65ed1fdc8d0a (Merge 1b89e62... into 622e5e6...). Production/test compilation succeeded. EtlServiceAmountIntegrityTest then ran six tests and all six failed because production threw no EtlRequestException; the rest of the ETL suite remained green before Maven stopped. This is valid RED at the real transformation/admission boundary, not a setup/import/fixture failure.

GREEN — fail closed before persistence

The bounded production repair changes the amount transformation so malformed/blank/unsupported numeric input is classified through the existing stable invalid-record path rather than rewritten to zero. Valid values retain deterministic BigDecimal formatting and HALF_UP scale-2 behavior. Whole-batch prevalidation, transaction boundaries, idempotency, payload limits, response shape and JDBC parameterization remain unchanged.

Subsequent tests preserve genuine zero separately from invalid input and cover precision/scale boundaries and whole-batch rejection before JDBC.

Documentation RED → GREEN

After behavior was green, EtlBatchDocsAlignmentTest required the changelog to state the buyer-visible fail-closed amount-integrity contract. CI 31358691197, macOS job 93363094463, reached that documentation boundary with EtlServiceAmountIntegrityTest 6/6 green and failed only changelogRecordsFailClosedAmountIntegrity because the existing sentence did not contain the canonical lowercase phrase required by the contract.

Exact current head 27707b72ba1865fe86e24dfbecdc740a586a258b changes only that changelog wording: invalid AMOUNT values fail closed before persistence instead of being rewritten to 0.00, preserving the distinction from a genuine zero.

Current hosted proof

All exposed workflow aggregates for exact source head 27707b72ba1865fe86e24dfbecdc740a586a258b are terminal-success:

• CI 31361048737: success on macOS, Ubuntu and Windows;
• Dependency Review 31361048765: success;
• CycloneDX SBOM 31361048779: success;
• SAST Semgrep 31361048735: success;
• Security Scan 31361048747: success.

CI macOS job 93369857424 checked out synthetic merge f2d5e2042873b31047afda21b7bfb385e9794c4b, not literal source head. On that integration tree EtlBatchDocsAlignmentTest passed 5/5, EtlServiceAmountIntegrityTest passed 6/6, ETL ran 283 tests with zero failures/errors/skips, CDC ran 106 tests, gateway tests passed, and the reactor finished BUILD SUCCESS.

The same CI still reproduces the inherited protected JaCoCo false-green: Analyzed bundle 'etl-service' with 0 classes followed by coverage success. #162/#164 owns selected-bundle non-vacuity, and #205 owns repository-wide coverage scope. Current protected PR workflows also use synthetic merge checkout rather than accepted literal source. #196 separately owns complete Maven dependency-resolution evidence for vulnerability scanning. These controls are independent of this amount-integrity fix.

Merge boundary

Keep Draft. Merge only when the unchanged exact source head has accepted literal-source deterministic/security evidence, complete same-revision dependency/vulnerability evidence, non-vacuous owned-production coverage, every required repository/security gate, zero valid unresolved review findings, and qualifying independent non-author formal approval where governance requires it. No predecessor-head, other-PR, status-only, skipped-required, incomplete-scanner, or synthetic-merge-only evidence transfers.

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