Record REV004 regression and fallback-reduction evidence

The evidence captures the new regression scripts, formal-first query
narrowing, and the fresh verification trail used to support the next
round of fallback removal.

Constraint: Evidence must match commands and outcomes actually executed in backend worktree
Rejected: Fold this into an older summary doc | would hide the stepwise proof for fallback reduction
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep appending fresh verification evidence here until the remaining legacy fallback is either removed or explicitly retained
Tested: Evidence cross-checked against backend worktree commands, regression logs, and targeted test outputs
Not-tested: No doc export/render pipeline executed

docs/evidence/rev004-automation-and-legacy-reduction-2026-04-17.md

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+# REV004 自动化回归脚本 + legacy fallback 缩减（2026-04-17）
+
+## 本轮目标
+1. 为 REV004 建立可重复执行的自动化回归脚本入口。
+2. 继续缩小 accountProcess 对 legacy fallback 的直接依赖面。
+
+## 后端代码变更
+### 1. 新增回归脚本目录
+后端新增：`script/rev004-regression/`
+- `env.sh`
+- `01_prepare_env.sh`
+- `02_unit_regression.sh`
+- `03_live_db_smoke.sh`
+- `04_summary.sh`
+- `run_all.sh`
+
+说明：
+- unit 回归默认覆盖：`AccountingAdjustQueryServiceImplTest`、`AccountingAdjustProcessServiceImplTest`、`AccountingAdjustActionServiceImplTest`、`ChargeServiceAccountingAdjustTest`、`PrestorageFormalizationServiceTest`
+- live DB smoke 默认覆盖：
+  - `Rev004AccountProcessLiveDbReadinessTest`
+  - `Rev004AccountProcessCanaryQueryIntegrationTest`
+    - `prestoragePage_shouldReturnSuccessEnvelope`
+    - `prestorageSubmit_shouldChangeBalanceAndWriteOperatLog`
+    - `prestorageRevoke_shouldRestoreBalanceAndWriteRevokeLog`
+    - `prestorageSubmit_thenProcessAndAttachmentsShouldExposeReturnedAdjustmentNo`
+
+### 2. 缩减 legacy fallback 使用面
+#### `AccountingAdjustProcessServiceImpl`
+- `getProcess(...)`：调整为
+  - prestorage formal 优先
+  - unified snapshot 次优先
+  - synthetic snapshot 仅在 unified 缺失时兜底
+- `getAttachments(...)`：调整为
+  - prestorage formal 优先
+  - unified snapshot 次优先
+  - synthetic snapshot 仅在 unified 缺失时兜底
+
+#### `AccountingAdjustQueryServiceImpl`
+- page 聚合时，先汇总 formal adjustmentNo 集合
+- legacy request log 转换出的 request record 若 adjustmentNo 已被 formal 记录覆盖，则不再进入 merged 集合
+- 保留 legacy log 的审计/兜底职责，但不再重复参与 formal 已覆盖对象的主结果聚合
+
+## 新增/更新测试
+### 单测补强
+- `AccountingAdjustProcessServiceImplTest`
+  - `getProcess_shouldPreferUnifiedSnapshotOverSyntheticFallback`
+  - `getAttachments_shouldPreferUnifiedSnapshotOverSyntheticFallback`
+- `AccountingAdjustQueryServiceImplTest`
+  - `getAccountingAdjustPage_shouldSkipLegacyRequestRecordWhenFormalRecordExists`
+
+## 验证结果
+### 1. unit 回归
+执行：
+```bash
+script/rev004-regression/02_unit_regression.sh
+```
+结果：
+- `Tests run: 68, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+### 2. live DB smoke
+执行：
+```bash
+script/rev004-regression/03_live_db_smoke.sh
+```
+结果：
+- `Tests run: 5, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+### 3. 一键入口
+执行：
+```bash
+script/rev004-regression/run_all.sh
+```
+结果：
+- unit + live DB smoke 均通过
+- 日志目录：
+  - `.omx/logs/rev004-regression/20260417T110151Z`
+
+## 当前边界
+- 当前 live DB smoke 默认仍以 prestorage 稳定链路为主，用来验证真实数据库 + Spring + MockMvc + formal/legacy 协同路径。
+- writtenoff / price diff / redink / bad debt 在本轮主要由 targeted unit regression 覆盖；后续可继续补到 live DB fixture。
+- `Rev004AccountProcessCanaryQueryIntegrationTest` 中仍有其它更大范围场景未纳入默认 smoke 入口，本轮没有把它们全部收进默认脚本，以避免把未收敛场景误当作回归主入口。
+
+## 结论
+本轮已完成：
+- REV004 自动化回归脚本首版落地
+- 一键执行入口可用
+- process / attachments 的 legacy fallback 优先级继续收口
+- page 聚合中的 duplicate legacy request 参与面继续缩小
+
+
+## 追加收口（继续删 fallback）
+### Query 层进一步收口
+- `AccountingAdjustQueryServiceImpl#getAccountingAdjustPage(...)`
+  - `loadLatestActionMap(...)` 改为只对 legacy request records 构建 action overlay
+  - formal 记录即使 chargeId 下存在 legacy approval log，也不再被 legacy 审批轨迹回填覆盖主状态
+
+### 新增回归测试
+- `getAccountingAdjustPage_shouldNotLetLegacyApprovalOverrideFormalRecord`
+  - 验证：formal 已存在时，legacy approval log 不再覆盖 formal 的 `approvalStatus/resultStatus/writeBackStatus/message/actionAmount`
+
+### 本次追加验证
+执行：
+```bash
+mvn -pl sw-business/sw-business-server -Dtest=AccountingAdjustQueryServiceImplTest,AccountingAdjustProcessServiceImplTest test
+```
+结果：
+- `Tests run: 32, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+
+### 统计口径锁定
+新增测试：
+- `getAccountingAdjustStat_shouldIgnoreLegacyApprovalForFormalRecord`
+
+验证：
+- formal record 已存在时，legacy approval/action 不再把统计口径从 `PENDING_APPROVAL` 误改成 `APPROVED`
+- `totalActionAmount` 仍取 formal 金额
+
+执行：
+```bash
+mvn -pl sw-business/sw-business-server -Dtest=AccountingAdjustQueryServiceImplTest test
+```
+结果：
+- `Tests run: 13, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+再次执行：
+```bash
+script/rev004-regression/run_all.sh
+```
+结果：
+- unit：`Tests run: 69, Failures: 0, Errors: 0, Skipped: 0`
+- live smoke：`Tests run: 5, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+
+### 日志查询口径锁定
+新增测试：
+- `getAccountingAdjustLogs_shouldReturnSyntheticFormalLogWhenLegacyLogsMissing`
+
+验证：
+- formal 对象即使没有 legacy operat_log，也能通过 `getAccountingAdjustLogs` 返回一条 synthetic formal log
+- 前端日志页不再被 legacy log 是否存在所卡死
+
+执行：
+```bash
+mvn -pl sw-business/sw-business-server -Dtest=AccountingAdjustQueryServiceImplTest test
+```
+结果：
+- `Tests run: 14, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`
+
+
+### action-only 日志补齐
+新增测试：
+- `getAccountingAdjustLogs_shouldPrependSyntheticFormalLogWhenOnlyActionLogExists`
+
+验证：
+- formal 对象若只有 legacy action log、没有 legacy request log
+- 日志列表会自动在前面补一条 synthetic formal log，再保留 legacy action log
+- 前端日志时间线可同时看到 formal 主记录和 legacy 审批动作
+
+执行：
+```bash
+mvn -pl sw-business/sw-business-server -Dtest=AccountingAdjustQueryServiceImplTest test
+```
+结果：
+- `Tests run: 15, Failures: 0, Errors: 0, Skipped: 0`
+- `BUILD SUCCESS`