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OJ2/apps/api/src/db/meta/0006_snapshot.json
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xuyueandClaude Opus 5 cf1eea0810
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fix(比赛): 学生管理员开卷、导出只剩十行、排行榜翻页错位等四处 
## 学生管理员在比赛进行中能看所有人的代码

canViewSubmission 里 isAdminRole(user) 是无条件放行的捷径，而 ADMIN_ROLES 含
Student Admin —— 同时 contest.ts 的排行榜又把这个角色算作参赛者。既在榜上、
又能读别人的提交，就是开卷。比赛未结束（未开始 + 进行中）时不再吃这条捷径。

旧后端这里写的是 `not user.is_regular_user()`，学生管理员同样放行，所以这条是
相对旧栈**收紧**的一处，不是修回归。只掐角色捷径，不掐 problem.createdById ——
那是这道题的作者本人，他早就知道答案，挡他没有意义。老师和超管不受影响，他们不参赛。

实跑（造了一场进行中、一场已结束的比赛，各一条别人的提交）：学生管理员在进行中的
比赛里列表 showLink=false、详情 404，比赛结束后恢复 200；超管两种状态都是 200；
学生管理员读**自己**比赛中的提交仍然 200，没有把他自己的记录一起挡掉。

同族的 flowchart.ts canView 有同样的角色捷径，但流程图提交入库时从不写 contest_id
（永远是 null），那条路上不存在「比赛中的别人的提交」，不用跟着改。

## 获奖名单导出，参赛超过 250 人时只导出十个人

rank.vue 用 `limit: total.value || 10000` 想一次拉全量，但 queryInteger 对超出
上限的值是**静默回落到默认的 10**，不是截断到 250。于是 300 人的比赛导出 10 行，
而一二三等奖的分档仍按真实总人数算 —— 老师拿到一份十个人、等级全错的名单，还不报错。
改成按 250 一页循环拉，两个出口都留：拿不满一页说明到底了，比对 total 是防着最后
一页正好整除。班级赛（≤250）碰不到这个坑，全校赛会。

实跑：造 20 条排名，limit=300 后端确实只返回 10 行，limit=250 返回 20，
新逻辑拉回 20。

## 排行榜翻页没有全序

只按 acceptedNumber desc, totalTime asc 排，同分同罚时行序不稳定，而这条列表是
limit/offset 翻页的 —— 同一个人可能在第 2 页出现两次，另一个人从此消失。末尾补
asc(id) 兜全序，id 不参与名次，只保证同分的人每次按同一顺序排。

实跑：20 个同 AC 数同罚时的选手，每页 5 条翻 4 页，共 20 行去重后仍是 20 人，
连翻两轮顺序完全一致。

## acm-helper 两个接口对 visible 的口径不一致

GET 要求 visible = true，PUT 不要求。比赛结束后收起来，核查页就打不开了，
而标记接口还能用。赛后核查恰恰常发生在比赛已经收起来之后，按 PUT 的口径放开。

## 删掉 contest_announcement

旧 Django 栈有「比赛公告」，OJ2 从头到尾没搬：没有路由、没有契约、没有前端页面，
表建在那里纯粹是 introspect 0000 时一起拉进来的。确认不需要，连表带 schema 定义
一起删。

删除前核实：没有任何表外键指向它，序列由本表 owned 会随 DROP TABLE 一并消失，
生产快照（db_backup_2026_08_07）里只有 1 行 —— 2022 年 4 月挂在 contest 1 上的
一条测试公告。迁移不写 CASCADE，同 0002：真有别的东西引用了，宁可报错也别被悄悄
级联掉。

**上生产要显式放行**：migrate.ts 的破坏性闸会拦下 DROP TABLE，得
`OJ2_ALLOW_DESTRUCTIVE=1 docker/deploy.sh`，并按它说的先备份。本机已实跑：
不带环境变量确实被拦，带上之后表和序列都没了，重跑是「没有待执行的迁移」，
db:generate 报 No schema changes（snapshot 与 schema.ts 对齐，不给下一条迁移留假 diff）。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013rpSKCNpVcMhTFhw21YiL7
2026-09-02 20:38:04 -06:00

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"update_time": {
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"type": "timestamp with time zone",
"primaryKey": false,
"notNull": true
},
"user_id": {
"name": "user_id",
"type": "integer",
"primaryKey": false,
"notNull": true
}
},
"indexes": {},
"foreignKeys": {
"user_stat_user_id_73337fc0_fk_user_id": {
"name": "user_stat_user_id_73337fc0_fk_user_id",
"tableFrom": "user_stat",
"tableTo": "user",
"columnsFrom": [
"user_id"
],
"columnsTo": [
"id"
],
"onDelete": "no action",
"onUpdate": "no action"
}
},
"compositePrimaryKeys": {},
"uniqueConstraints": {
"user_stat_user_id_key": {
"name": "user_stat_user_id_key",
"nullsNotDistinct": false,
"columns": [
"user_id"
]
}
},
"policies": {},
"checkConstraints": {},
"isRLSEnabled": false
}
},
"enums": {},
"schemas": {},
"sequences": {},
"roles": {},
"policies": {},
"views": {},
"_meta": {
"columns": {},
"schemas": {},
"tables": {}
}
}
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