docs(changelog): #5444 Step2 canonical full snapshot 与稳定槽位 交接前端
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---
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schema: "hl-changelog/v2"
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ticket: "5444"
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title: "Step2 canonical full snapshot 与稳定槽位"
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consumer: "admin"
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author: "wx(GIT)"
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change_type: "修改接口"
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backend_status: "pending"
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gateway_status: "pending"
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frontend_status: "pending"
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frontend_owner: ""
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frontend_ref: ""
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target_release: ""
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verified_at: ""
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status_note: ""
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updated_at: "2026-08-03"
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base: "dev-v3"
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generated: "2026-08-03T23:34:18+08:00"
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---
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# Step2 canonical full snapshot 与稳定槽位
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> #5444(#5366 B08/B09 后端):派车弹窗 Step2 canonical full snapshot 与稳定槽位。
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> 后端实现已合入 PR #5448(待合并状态);后端/网关状态以部署验证为准。
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## 关联
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- Issue: #5444
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- PR: [#5448](https://git.1814.love:8443/wx/HL/pulls/5448)
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## 变更接口
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| 方法 | 路径 | 来源 |
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|---|---|---|
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| `POST` | `/admin/fleet/assignments/candidates` | 响应新增 `canonicalSnapshot` 区块;请求新增可选同代校验参数(additive,向后兼容) |
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## 契约影响文件
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- `hl-fleet-service/src/main/java/com/hulalv/fleet/assignment/vo/AssignmentCandidateReqVO.java`
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- `hl-fleet-service/src/main/java/com/hulalv/fleet/assignment/vo/AssignmentCandidateRespVO.java`
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- `hl-fleet-service/src/test/java/com/hulalv/fleet/assignment/controller/AssignmentControllerTest.java`
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## 请求新增(均可选)
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- `expectedPlanGeneration`(Long·String):Step2 幂等重试/同代校验期望计划代际;携带且与当前 canonical 快照不符时以 `605061` 拒绝(generation 漂移 fail-closed)。
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- `expectedSnapshotVersion`(Long·String):同上,期望快照版本。
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## 响应新增 `canonicalSnapshot` 区块(additive)
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- `planGeneration`(Long·String):当前计划代际(不透明令牌);与 `snapshotVersion` 共同标识同一份 canonical 快照。
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- `snapshotVersion`(Long·String):当前快照版本;同代内容修订递增。
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- `retainedSlotIds`(Long·String[]):有序 RetainedSlotSet(稳定槽位集合);不重编号、不丢 protected/active slot、至少 1 个。
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- `editableServiceDates`(LocalDate[]):完整有序可编辑服务日。
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- `cells`:每个 `RetainedSlotSet × editableServiceDates` 笛卡尔积位置唯一 cell:
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- `slotId`(Long·String)
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- `serviceDate`(LocalDate)
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- `used`:`USED` / `UNUSED` / `null`(无切片行=未编辑)
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- `readOnly`(Boolean):只读 cell 不可被批量操作改写
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- `readOnlyReason`(String):只读原因;可编辑为 null(派单已完结 / 派单已取消 / 服务日期已过去 / 对账期已关账)
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- `vehicleId` / `driverId`(Long·String,未派或不用车为 null)
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- `selectedVehicle`(对象,未选或资源失效为 null):`vehicleId` / `plate` / `modelName` / `seats`
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- `selectedDriver`(对象,未选或资源失效为 null):`driverId` / `name` / `maskedPhone`(司机域脱敏)/ `driverStatus` / `season`
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## 行为说明(B08/B09)
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- 首次进入 Step2 且不存在稳定槽位时,后端在 requirement 锁 + 独立新事务内原子生成至少 1 个稳定 `slotId` 并落 `fleet_assignment` unassigned 每日切片;同一 `planGeneration + snapshotVersion` 下重复读取/幂等重试不重复建槽、不重编号。
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- `selectedVehicle`/`selectedDriver` 为与 `snapshotVersion` 同代的已选资源展示快照,独立于候选分页/筛选;null/失效资源 fail-closed 不编造。
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- 未传 `requirementId` 或需求上下文不可用时 `canonicalSnapshot` 为 `null`,候选查询本身不受影响。
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## 前端/调用方动作
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- Step2 前端可消费 `canonicalSnapshot` 区块组织稳定槽位 UI;重复读取/幂等重试时回传 `expectedPlanGeneration`/`expectedSnapshotVersion` 做同代校验。
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- 不新增前端建槽 API 与二次批量查询 API;`selectedVehicle`/`selectedDriver` 直接取自现有 `selectedVehicleId`/`selectedDriverId` 入参。
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- 未消费新字段的既有调用保持兼容(additive)。
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## 验证证据
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- 定向测试:`Step2CanonicalSnapshotServiceTest`(11 用例:首次原子建槽/同代幂等不重编号/并发/漂移 fail-closed/脱敏/跨页过滤/null 失效/readOnly cell)、`AssignmentCandidateServiceTest`、`AssignmentControllerTest`(canonicalSnapshot 挂载 + 透传),全部通过。
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- Fleet 全量测试:3022/3023 通过;唯一失败 `FleetInsuranceTaskTeamNoMysqlTest` 为 Testcontainers 无 Docker 环境型失败(基线上同样失败)。
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- Spotless `spotless:check` 通过。
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- 网关验证:待测试部署后补充(`backend_status`/`gateway_status` 保持 pending)。
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- 兼容性结论:请求/响应均为 additive 扩展,向后兼容。
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