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skillhub/docs/16-backend-time-inventory.md
dongmucat 04caf21e76
fix(audit): resolve 8-hour timezone offset in audit log timestamps (#472) 
## Problem
Audit log timestamps displayed 8 hours later than actual time when JVM
default timezone != UTC. Root cause: `audit_log.created_at` was
`TIMESTAMP without time zone`, and `rs.getTimestamp()` interprets bare
values using JVM timezone.

## Solution
### Backend
- **V42 migration**: Upgrade `audit_log.created_at` from `TIMESTAMP` to
  `TIMESTAMPTZ`, anchor historical data as UTC via `USING created_at AT
  TIME ZONE 'UTC'` (same pattern as V18/V19/V23/V25/V36)
- **Read path**: `AdminAuditLogAppService.readInstant()` uses
  `rs.getObject(col, OffsetDateTime.class).toInstant()`, result
  independent of JVM timezone
- **Write path (filter params)**: `startTime`/`endTime` binding changed
  from `Timestamp.from()` to `OffsetDateTime.ofInstant(instant,
  ZoneOffset.UTC)` via `toUtcOffsetDateTime()` helper, symmetric with
  read path

### Migration Safety
- `SET LOCAL lock_timeout = '30s'` (transaction-scoped, won't leak to pool)
- `DO $$ ... IF data_type = 'timestamp without time zone' THEN ... ELSE
  ... END $$` idempotent guard with dual-branch `RAISE NOTICE`
- Safe retry: re-running won't double-apply `AT TIME ZONE 'UTC'`

### Test Coverage (10 tests, 477 total suite)
- `rowMapper_readsCreatedAtAsInstant` — UTC offset regression
- `rowMapper_normalisesNonUtcOffsetToInstant` — Non-UTC offset (+08:00)
- `rowMapper_returnsNullTimestampWhenColumnIsNull` — Null path
- `rowMapper_isIndependentOfJvmDefaultTimezone` — JVM TZ=Asia/Shanghai
  drift prevention with `verify(rs, never()).getTimestamp()`
- `@ParameterizedTest buildWhereClause_bindsTimeRangeAsOffsetDateTime` —
  3 cases (both/startOnly/endOnly) for filter param binding
- `@BeforeEach setUp()` — Mock isolation to prevent cross-test stub
  accumulation

## Quality Gates
- [x] `make test-backend-app` passes (477 tests, 0 failures)
- [x] No Controller changes, `make generate-api` not needed
- [x] No frontend changes, typecheck/lint/e2e not needed

## Deployment
V42 must run before new code (guaranteed by Spring Boot startup sequence
→ Flyway executes before app accepts traffic). Rolling deployment:
- New pod + migrated column: correct
- Old pod + migrated column: old code reads TIMESTAMPTZ correctly (pgjdbc
  returns absolute instant)

## Related Docs
- `docs/15-backend-time-governance-plan.md` §3.1: V42 progress registered
- `docs/16-backend-time-inventory.md` §3.1: V42 listed
- Same migration pattern: V18/V19/V23/V25/V36
2026-06-05 15:28:12 +08:00

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# skillhub 后端时间字段台账
## 1. 扫描范围
本台账基于 `server/skillhub-app`、`server/skillhub-auth`、`server/skillhub-domain`、`server/skillhub-infra`、`server/skillhub-storage` 的当前生产代码与 Flyway migration。
目标已经从“摸底问题分布”转为“记录当前真实进展与剩余尾项”。
## 2. 当前代码分布
### 2.1 生产代码中的 `LocalDateTime` 已基本清空
当前生产代码里只剩 1 处兼容解析保留 `LocalDateTime`：
- `ApiTokenService`
- 用于兼容旧接口传入的裸时间字符串
- 当前明确按 UTC 解释后转成 `Instant`
此前集中使用 `LocalDateTime` 的主链区域已完成迁移或收口：
- 认证与账号：
- `api_token`
- `account_merge_request`
- `user_account`
- `identity_binding`
- `role`
- `user_role_binding`
- `local_credential`
- 核心领域：
- `namespace`
- `namespace_member`
- `skill`
- `skill_version`
- `skill_file`
- `skill_tag`
- `skill_version_stats`
- `skill_report`
- `skill_star`
- `skill_rating`
- 服务层：
- `AccountMergeService`
- `LocalAuthService`
- `SkillPublishService`
- `SkillGovernanceService`
- `ReviewService`
- `PromotionService`
- `SkillReportService`
- DTO 与接口输出：
- `NamespaceResponse`
- `MemberResponse`
- `SkillSummaryResponse`
- `SkillVersionResponse`
- `SkillVersionDetailResponse`
- `TagResponse`
- `AdminUserSummaryResponse`
- `AdminSkillReportSummaryResponse`
结论：
- 主系统核心“事件发生时间”已经基本收口成 UTC 绝对时间
- 当前剩余工作主要是兼容策略、数据库尾项复核和防回归约束
### 2.2 `Instant` 已成为主流绝对时间类型
当前已稳定使用 `Instant` 的代表区域：
- 审计：
- `AuditLog`
- `AuditLogItemResponse`
- 通知：
- `UserNotification`
- 审核流程：
- `ReviewTask`
- `PromotionRequest`
- `ReviewTaskResponse`
- `PromotionResponseDto`
- 幂等：
- `IdempotencyRecord`
- `IdempotencyInterceptor`
- `IdempotencyCleanupTask`
- 技能主链：
- `Skill`
- `SkillVersion`
- `SkillTag`
- `SkillFile`
- `SkillVersionStats`
- 认证主链：
- `ApiToken`
- `AccountMergeRequest`
- `UserAccount`
- `IdentityBinding`
- `Role`
- `UserRoleBinding`
- `LocalCredential`
## 3. 数据库层分布
### 3.1 已完成的 `TIMESTAMPTZ` 迁移
- `V12__governance_notifications.sql`
- `user_notification.created_at / read_at`
- `V24__api_token_timestamptz.sql`
- `api_token.expires_at / last_used_at / revoked_at / created_at`
- `V25__account_merge_request_timestamptz.sql`
- `account_merge_request.token_expires_at / completed_at / created_at`
- `V26__skill_version_timestamptz.sql`
- `skill_version.published_at / created_at / yanked_at`
- `V16__skill_hidden_at_timestamptz.sql`
- `skill.hidden_at`
- `V17__skill_created_updated_timestamptz.sql`
- `skill.created_at / updated_at`
- `V18__namespace_timestamptz.sql`
- `namespace.created_at / updated_at`
- `namespace_member.created_at / updated_at`
- `V19__skill_secondary_timestamptz.sql`
- `skill_tag.created_at / updated_at`
- `skill_file.created_at`
- `skill_version_stats.updated_at`
- `V20__social_and_skill_report_timestamptz.sql`
- `skill_star.created_at`
- `skill_rating.created_at / updated_at`
- `skill_report.created_at / handled_at`
- `V21__user_account_timestamptz.sql`
- `user_account.created_at / updated_at`
- `V22__auth_supporting_tables_timestamptz.sql`
- `identity_binding.created_at / updated_at`
- `role.created_at`
- `user_role_binding.created_at`
- `local_credential.locked_until / created_at / updated_at`
- `V23__review_and_idempotency_timestamptz.sql`
- `review_task.submitted_at / reviewed_at`
- `promotion_request.submitted_at / reviewed_at`
- `idempotency_record.created_at / expires_at`
- `V42__audit_log_created_at_timestamptz.sql`
- `audit_log.created_at`
### 3.2 当前状态
- 主链核心事件时间列已基本完成 `TIMESTAMPTZ` 收口
- 初始建表 migration 中仍然能看到旧 `TIMESTAMP` 定义，但已由后续 Flyway 升级覆盖
- 后续重点不是“大批量迁移”，而是查漏补缺和约束新增
## 4. 已解决的高风险热点
### 4.1 兼容层时区解释冲突
此前：
- `ClawHubCompatController` 按 `ZoneOffset.UTC` 转 epoch
- `ClawHubRegistryFacade` 按系统默认时区解释
当前：
- 已统一按 UTC 解释绝对时间
- `ClawHubRegistryFacade` 的 `LocalDateTime` epoch 转换重载已移除
### 4.2 服务层散落的 `now()`
此前热点包括：
- `ApiTokenService`
- `AccountMergeService`
- `LocalAuthService`
- `SkillPublishService`
- `SkillGovernanceService`
- `ReviewService`
- `PromotionService`
- `SkillReportService`
- 多个实体 `@PrePersist` / `@PreUpdate`
当前：
- 服务层当前时间已基本统一为注入 `Clock`
- 实体回调已基本统一为显式 UTC
## 5. 分批迁移进展
### Batch 1：基础设施与治理链路
已完成：
- UTC `Clock` Bean
- Hibernate UTC 配置
- Jackson UTC 配置
- `ApiResponseFactory`
- `IdempotencyInterceptor`
- `IdempotencyCleanupTask`
- 审计、通知、审核、幂等链路
### Batch 2：认证与账号链路
已完成：
- `ApiToken` / `ApiTokenService`
- `AccountMergeRequest` / `AccountMergeService`
- `LocalCredential`
- `UserAccount`
- `IdentityBinding`
- `Role`
- `UserRoleBinding`
- `LocalAuthService`
### Batch 3：技能核心领域
已完成：
- `Skill`
- `SkillVersion`
- `SkillFile`
- `SkillTag`
- `SkillVersionStats`
- `Namespace`
- `NamespaceMember`
- `SkillPublishService`
- `SkillGovernanceService`
- `ReviewService`
- `PromotionService`
- `SkillReport`
- `SkillStar`
- `SkillRating`
### Batch 4：DTO 与 API 契约收口
已完成：
- `NamespaceResponse`
- `MemberResponse`
- `SkillSummaryResponse`
- `SkillVersionResponse`
- `SkillVersionDetailResponse`
- `TagResponse`
- `AdminUserSummaryResponse`
- `AdminSkillReportSummaryResponse`
- `TokenController` 的 UTC 输出收口
## 6. 当前剩余尾项
- `ApiTokenService` 仍保留对裸 `LocalDateTime` 字符串的兼容解析
- 需要补静态扫描或 ArchUnit 约束，防止新增 `LocalDateTime.now()`
- 需要做一轮跨时区回归，把 `UTC` / `Asia/Shanghai` 纳入关键测试
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