chore(task): archive 04-28-feat-points-ledger
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# PRD:积分流水列表功能
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## 1. 背景与目标
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当前应用已有完整的积分账户系统:
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- 积分账户表:`user_points`
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- 积分业务流水:`points_ledger`(记录所有积分变动)
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- 积分余额查询接口:`GET /api/v1/points/balance`
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- 积分中心页面:`CoinCenterScreen`
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用户在积分中心可以看到余额和购买套餐,但无法查看积分的收支明细。本任务目标是增加积分流水列表功能,让用户了解自己的积分变动历史。
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## 2. 当前事实
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### 2.1 后端现状
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**已有的 `points_ledger` 表结构**:
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| 字段 | 类型 | 说明 |
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|------|------|------|
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| `id` | UUID | 主键 |
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| `user_id` | UUID | 用户 ID |
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| `direction` | smallint | 方向:1=收入,-1=支出 |
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| `amount` | bigint | 变动数量(正数) |
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| `balance_after` | bigint | 变动后余额 |
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| `change_type` | varchar | 类型:register/consume/adjust/purchase/refund |
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| `biz_type` | varchar | 业务类型:chat/payment(可空) |
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| `biz_id` | UUID | 业务 ID(可空) |
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| `event_id` | varchar | 幂等事件 ID |
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| `operator_id` | UUID | 操作者 ID(可空) |
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| `metadata` | jsonb | 扩展元数据 |
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| `created_at` | timestamptz | 创建时间 |
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**已有的索引**:
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- `ix_points_ledger_user_created_at`:支持按用户+时间倒序查询
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- `uq_points_ledger_user_event`:用户+事件唯一约束
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**已有的 Repository 方法**:
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- `append_ledger()`:写入流水
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- `has_ledger_event()`:检查事件是否存在
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**缺失**:
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- 无分页查询流水列表方法
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- 无 HTTP API 端点
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### 2.2 前端现状
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**已有的积分中心页面**:
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- `apps/lib/features/settings/presentation/screens/coin_center_screen.dart`
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- 显示余额和套餐卡片
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**已有的 API 调用**:
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- `apps/lib/features/points/data/apis/points_api.dart`:仅支持 `getPackages()`
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**缺失**:
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- 无流水列表 API 调用
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- 无流水列表页面/组件
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## 3. 需求范围
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### 3.1 必须实现
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**后端**:
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- 新增 `GET /api/v1/points/ledger` 接口
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- 支持分页(游标分页,按 `created_at` 倒序)
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- 返回流水列表,包含:时间、类型、金额、余额、描述
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**前端**:
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- 在积分中心页面添加「查看流水」入口
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- 新建流水列表页面,支持分页加载
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- 流水项展示:类型图标、类型文案、金额(+绿色/-红色)、时间、余额
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### 3.2 本期不做
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- 按类型筛选(可作为后续优化)
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- 导出流水
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- 流水详情页
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## 4. 数据契约
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### 4.1 API 接口
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**请求**:
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```
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GET /api/v1/points/ledger?limit=20&cursor={created_at_iso}
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```
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**响应**:
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```json
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{
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"items": [
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{
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"id": "uuid",
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"direction": 1,
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"amount": 100,
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"balanceAfter": 500,
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"changeType": "purchase",
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"displayText": "购买积分包",
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"createdAt": "2026-04-28T10:00:00Z"
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}
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],
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"nextCursor": "2026-04-27T10:00:00Z",
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"hasMore": true
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}
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```
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### 4.2 change_type 对应展示文案
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| change_type | direction | 展示文案(中文) | 展示文案(英文) |
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|-------------|-----------|------------------|------------------|
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| register | 1 | 注册赠送 | Registration bonus |
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| purchase | 1 | 购买积分包 | Purchase credits |
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| consume | -1 | AI 对话消耗 | AI chat cost |
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| adjust | ±1 | 系统调整 | System adjustment |
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| refund | -1 | 退款 | Refund |
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## 5. 技术方案
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### 5.1 后端实现
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**Repository 层**(`v1/points/repository.py`):
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```python
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async def list_ledger(
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self,
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*,
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user_id: UUID,
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limit: int,
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cursor: datetime | None = None,
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) -> tuple[list[PointsLedger], bool]:
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# 查询 points_ledger 表
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# 按 created_at DESC 分页
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# 返回 (items, has_more)
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```
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**Service 层**(`v1/points/service.py`):
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```python
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async def get_ledger_list(
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self,
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*,
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user_id: UUID,
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limit: int = 20,
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cursor: str | None = None,
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) -> LedgerListResult:
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# 调用 repository
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# 组装 display_text
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# 返回响应
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```
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**Router 层**(`v1/points/router.py`):
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```python
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@router.get("/ledger", response_model=LedgerListResponse)
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async def get_points_ledger(...):
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...
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```
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### 5.2 前端实现
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**目录结构**:
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```
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apps/lib/features/points/
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├── data/
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│ ├── apis/
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│ │ └── points_api.dart # 新增 getLedger()
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│ └── models/
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│ ├── package_info.dart # 已有
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│ └── ledger_item.dart # 新增
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└── presentation/
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└── screens/
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└── points_ledger_screen.dart # 新增
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```
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**入口**:
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- 在 `CoinCenterScreen` 的余额卡片下方添加「查看流水」按钮
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- 点击后导航到 `PointsLedgerScreen`
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## 6. 实现步骤
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### Phase 1: 后端 API
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1. 新增 Schema:`LedgerItem`、`LedgerListResponse`(`v1/points/schemas.py`)
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2. 新增 Repository 方法:`list_ledger()`(`v1/points/repository.py`)
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3. 新增 Service 方法:`get_ledger_list()`(`v1/points/service.py`)
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4. 新增 Router 端点:`GET /ledger`(`v1/points/router.py`)
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5. 编写单元测试
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### Phase 2: 前端 UI
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1. 新增 Model:`LedgerItem`(`features/points/data/models/ledger_item.dart`)
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2. 新增 API 方法:`getLedger()`(`features/points/data/apis/points_api.dart`)
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3. 新增页面:`PointsLedgerScreen`(`features/points/presentation/screens/points_ledger_screen.dart`)
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4. 修改 `CoinCenterScreen`,添加入口按钮
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5. 添加 i18n 文案(`app_zh.arb`、`app_en.arb`、`app_zh_hant.arb`)
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## 7. 验收标准
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- [ ] 后端 API 返回正确的分页数据
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- [ ] 前端能正确加载并展示流水列表
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- [ ] 流水类型显示对应文案
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- [ ] 金额按收支方向显示不同颜色
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- [ ] 分页加载正常工作
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- [ ] 无数据时显示空状态
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- [ ] 加载中显示 loading 状态
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