diff --git a/apps/api/package.json b/apps/api/package.json
index 980bbdc..a2cb24b 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -11,8 +11,7 @@
     "worker": "bun src/main.ts worker",
     "build": "bun build --compile --target=bun-linux-x64 src/main.ts --outfile ../../dist/oj2-api",
     "seed:dev": "bun src/scripts/seed-dev.ts",
-    "backfill:problemsets": "bun src/main.ts backfill-problemsets",
-    "fix:achievement-hours": "bun src/main.ts fix-achievement-hours",
+    "recount": "bun --env-file=../../.env src/main.ts recount",
     "typecheck": "tsc --noEmit",
     "check:routes": "bun src/scripts/check-route-shadowing.ts",
     "check:ast": "bun src/scripts/check-ast-targets.ts",
diff --git a/apps/api/src/main.ts b/apps/api/src/main.ts
index df9ba50..616dfb3 100644
--- a/apps/api/src/main.ts
+++ b/apps/api/src/main.ts
@@ -12,9 +12,7 @@
  *   oj2-api healthcheck  # 探活，给 Dockerfile 的 HEALTHCHECK 用
  *   oj2-api sql-child    # SQL 判题子进程，由服务自己 spawn，不该手动调
  *   oj2-api migrate      # 执行待办的数据库迁移，部署时由 docker/deploy.sh 调
- *   oj2-api backfill-problemsets  # 把题单进度与奖章订正到与规则一致，默认只读预演
- *   oj2-api recount               # 把题目/用户的计数列、成就的已解锁数重算回与明细一致，默认只读预演
- *   oj2-api fix-achievement-hours # 订正「夜猫子」「早起的鸟儿」的历史误发，默认只读预演
+ *   oj2-api recount      # 把题目/用户的计数列、成就的已解锁数重算回与明细一致，默认只读预演
  *
  * 用动态 import 而非顶层 import：这几个模块都有导入即执行的副作用
  * （Bun.serve、连 Redis 开消费者），静态导入会让 sql-child 也把整个服务拉起来。
@@ -36,25 +34,12 @@ switch (command) {
     await runMigrations()
     break
   }
-  // 一次性的数据订正，跟着二进制走而不是留成源码脚本 —— 生产镜像里没有 bun 也没有源码
-  case "backfill-problemsets": {
-    const { backfillProblemSets } = await import("./scripts/backfill-problemsets")
-    const args = process.argv.slice(3)
-    process.exit(await backfillProblemSets({
-      apply: args.includes("--apply"),
-      allowRevoke: args.includes("--allow-revoke"),
-    }))
-  }
-  // 同上，一次性的数据订正。反范式计数列被重判等操作带偏之后拿它对账。
+  // 数据订正，跟着二进制走而不是留成源码脚本 —— 生产镜像里没有 bun 也没有源码。
+  // 反范式计数列被重判等操作带偏之后拿它对账，默认只读预演，--apply 才写。
   case "recount": {
     const { recount } = await import("./scripts/recount")
     process.exit(await recount({ apply: process.argv.slice(3).includes("--apply") }))
   }
-  // 同上。OJ2 上线时区丢了两周，两个小时口径的成就按 UTC 误发了一批，拿它订正。
-  case "fix-achievement-hours": {
-    const { fixAchievementHours } = await import("./scripts/fix-achievement-hours")
-    process.exit(await fixAchievementHours({ apply: process.argv.slice(3).includes("--apply") }))
-  }
   case "sql-child": {
     const { runSqlChild } = await import("./judge/sql/child")
     await runSqlChild()
@@ -75,6 +60,6 @@ switch (command) {
     }
   }
   default:
-    console.error(`未知子命令：${command}\n可用：serve | worker | migrate | backfill-problemsets | recount | fix-achievement-hours | healthcheck | sql-child`)
+    console.error(`未知子命令：${command}\n可用：serve | worker | migrate | recount | healthcheck | sql-child`)
     process.exit(2)
 }
diff --git a/apps/api/src/scripts/backfill-problemsets.ts b/apps/api/src/scripts/backfill-problemsets.ts
deleted file mode 100644
index 6ec25d2..0000000
--- a/apps/api/src/scripts/backfill-problemsets.ts
+++ /dev/null
@@ -1,275 +0,0 @@
-import { and, eq, inArray, isNull, sql } from "drizzle-orm"
-
-import { db, schema } from "../db"
-import { JudgeStatus } from "../judge/status"
-import { objectValue } from "../routes/helpers"
-import { badgeHolderDiff, computeProgress, recalculateBadge, resyncProgress } from "../services/problemset"
-
-/**
- * 把题单的进度和奖章订正到与当前规则一致。三笔历史欠账，一趟结清：
- *
- * 1. **进度漏记**。判题这一路记账（services/problemset.ts 的 recordSolvedProblem）是后来才有的，
- *    在那之前靠前端 AC 之后回调，只认路由参数里那一个题单：从普通题库入口做出同一道题不计进度，
- *    网络一抖就静默丢失。这里按实际 AC 记录补回来 —— 移植自旧栈的管理命令
- *    `problemset/management/commands/fix_problemset_progress.py`。
- * 2. **奖章漏发**。奖章原本只在学生做出一道题那一刻发，进度从别的路径变了就没人回头判过达标。
- *    生产快照里 53 条应发未发、涉及 30 名学生 —— 其中 23 条正是上面那个管理命令留下的：
- *    它补进度，而旧栈的信号只挂在 ProblemSetProblem 和 ProblemSetBadge 上、不挂 Progress。
- * 3. **算法改过**。分母只算必做题（选做不再卡完成）、空题单不再算完成、total_score 跟着分值走。
- *    已有的行要跑一遍才会按新规则重算。
- *
- * 三件事必须一趟做完，因为它们首尾相接：补进度 → 完成状态变 → 奖章达标面变。
- * 落库走 resyncProgress，它重算进度之后会顺手重算该题单的全部奖章。
- *
- * 默认只读，把差异打出来；确认无误再加 --apply 落库。
- * 只要预演里出现「收回」就先停下来让人看清楚，要真的收回得显式加 --allow-revoke ——
- * user_badge 没有别处备份，earnedTime 删了就找不回来。
- *
- * 做成 main.ts 的子命令而不是独立脚本，是因为生产镜像里只有编译好的单二进制，
- * 既没有 bun 也没有源码。跑法对齐 migrate：
- *
- *   docker compose -f docker/compose.debian.yml run --rm oj-api oj2-api backfill-problemsets
- *   docker compose -f docker/compose.debian.yml run --rm oj-api oj2-api backfill-problemsets --apply
- */
-const ACCEPTED = [JudgeStatus.ACCEPTED, JudgeStatus.AST_CHECK_FAILED]
-
-type ProblemLink = { problemId: number; score: number; isRequired: boolean }
-
-async function loadSet(problemsetId: number) {
-  const [links, progresses, badges] = await Promise.all([
-    db.select({
-      problemId: schema.problemsetProblem.problemId,
-      score: schema.problemsetProblem.score,
-      isRequired: schema.problemsetProblem.isRequired,
-    }).from(schema.problemsetProblem).where(eq(schema.problemsetProblem.problemsetId, problemsetId)),
-    db.select().from(schema.problemsetProgress)
-      .where(eq(schema.problemsetProgress.problemsetId, problemsetId)),
-    db.select().from(schema.problemsetBadge)
-      .where(eq(schema.problemsetBadge.problemsetId, problemsetId)),
-  ])
-  return { links, progresses, badges }
-}
-
-/**
- * 找出「这个题单里的题，学生其实早就 AC 了，可进度里没记」的那些格子。
- *
- * 口径必须和 recordSolvedProblem 一模一样（非比赛提交、ACCEPTED 或 AST_CHECK_FAILED、
- * 取最早那次），否则补账工具会永远「发现」差异。题单里的题必定是非比赛题，所以
- * isNull(contestId) 实际上不会过滤掉任何东西，写上是为了两边字面一致。
- */
-async function recoverable(links: ProblemLink[], progresses: (typeof schema.problemsetProgress.$inferSelect)[]) {
-  const gaps: { userId: number; problemId: number }[] = []
-  for (const progress of progresses) {
-    const detail = objectValue(progress.progressDetail)
-    for (const link of links) {
-      if (!(String(link.problemId) in detail)) gaps.push({ userId: progress.userId, problemId: link.problemId })
-    }
-  }
-  if (gaps.length === 0) return new Map<string, string>()
-  const rows = await db.select({
-    userId: schema.submission.userId,
-    problemId: schema.submission.problemId,
-    // 和 recoverable 上面那段同口径。不加 `::text`：OID 1184 由 db/index.ts 统一转成
-    // ISO 8601 UTC，比 PG 文本更稳定（PG 文本的形状跟着会话时区走）。
-    // 注：这个值写进 progress_detail.submit_time，而那个字段没有任何读取方，
-    // 存量里还混着 Django 的 `...+00:00`，所以形状变化只影响 backfill 自己的差异比对。
-    solvedAt: sql<string>`min(${schema.submission.createTime})`,
-  }).from(schema.submission).where(and(
-    inArray(schema.submission.userId, [...new Set(gaps.map((g) => g.userId))]),
-    inArray(schema.submission.problemId, [...new Set(gaps.map((g) => g.problemId))]),
-    isNull(schema.submission.contestId),
-    inArray(schema.submission.result, ACCEPTED),
-  )).groupBy(schema.submission.userId, schema.submission.problemId)
-  const solved = new Map(rows.map((row) => [`${row.userId}:${row.problemId}`, row.solvedAt]))
-  const found = new Map<string, string>()
-  for (const gap of gaps) {
-    const key = `${gap.userId}:${gap.problemId}`
-    const at = solved.get(key)
-    if (at) found.set(key, at)
-  }
-  return found
-}
-
-export async function backfillProblemSets(options: { apply: boolean; allowRevoke: boolean }) {
-  const sets = await db.select({ id: schema.problemset.id, title: schema.problemset.title })
-    .from(schema.problemset).orderBy(schema.problemset.id)
-  if (sets.length === 0) {
-    console.log("没有任何题单，无事可做")
-    return 0
-  }
-
-  const now = new Date().toISOString()
-  const report = []
-  for (const set of sets) {
-    const { links, progresses, badges } = await loadSet(set.id)
-    const found = await recoverable(links, progresses)
-    const scoreByProblem = new Map(links.map((link) => [link.problemId, link.score]))
-
-    // 把补回来的格子先并进 detail，再按新规则重算 —— 奖章的差异要照着「补完账又重算过」
-    // 的进度看，否则预演报出来的名单和 --apply 之后的结果对不上
-    const next = progresses.map((row) => {
-      const detail = objectValue(row.progressDetail)
-      for (const link of links) {
-        const at = found.get(`${row.userId}:${link.problemId}`)
-        if (at) detail[String(link.problemId)] = { score: scoreByProblem.get(link.problemId) ?? 0, submit_time: at }
-      }
-      return { ...row, ...computeProgress(detail, links, row.completeTime, now) }
-    })
-
-    const changed = next.filter((row, i) => {
-      const was = progresses[i]!
-      return was.totalProblemsCount !== row.totalProblemsCount ||
-        was.completedProblemsCount !== row.completedProblemsCount ||
-        was.totalScore !== row.totalScore ||
-        was.isCompleted !== row.isCompleted ||
-        Math.abs(was.progressPercentage - row.progressPercentage) > 0.005 ||
-        was.completeTime !== row.completeTime ||
-        JSON.stringify(objectValue(was.progressDetail)) !== JSON.stringify(row.progressDetail)
-    })
-    const newlyCompleted = next.filter((row, i) => !progresses[i]!.isCompleted && row.isCompleted).length
-    const uncompleted = next.filter((row, i) => progresses[i]!.isCompleted && !row.isCompleted).length
-    const badgeDiffs = []
-    for (const badge of badges) badgeDiffs.push({ badge, ...(await badgeHolderDiff(badge, next)) })
-    report.push({
-      set, links, found, scoreByProblem,
-      changed: changed.length, newlyCompleted, uncompleted, badgeDiffs,
-      recovered: found.size,
-      recoveredUsers: new Set([...found.keys()].map((key) => key.split(":")[0]!)).size,
-    })
-  }
-
-  const recovered = report.reduce((n, r) => n + r.recovered, 0)
-  const progressRows = report.reduce((n, r) => n + r.changed, 0)
-  const completedGain = report.reduce((n, r) => n + r.newlyCompleted, 0)
-  const completedLoss = report.reduce((n, r) => n + r.uncompleted, 0)
-  const missing = report.reduce((n, r) => n + r.badgeDiffs.reduce((m, d) => m + d.missing.length, 0), 0)
-  const extra = report.reduce((n, r) => n + r.badgeDiffs.reduce((m, d) => m + d.extra.length, 0), 0)
-
-  console.log(`共 ${sets.length} 个题单\n`)
-  for (const r of report) {
-    const lines = []
-    if (r.recovered) {
-      lines.push(`      补录：${r.recovered} 道题已 AC 但进度里没记（${r.recoveredUsers} 名学生）`)
-    }
-    if (r.changed) {
-      lines.push(`      进度：${r.changed} 条要重算` +
-        (r.newlyCompleted ? `，其中 ${r.newlyCompleted} 条未完成 → 已完成` : "") +
-        (r.uncompleted ? `，${r.uncompleted} 条已完成 → 未完成` : ""))
-    }
-    for (const d of r.badgeDiffs) {
-      if (!d.missing.length && !d.extra.length) continue
-      lines.push(`      奖章[${d.badge.name}] ${d.badge.conditionType}/${d.badge.conditionValue}：` +
-        `应发 ${d.eligible} / 现有 ${d.held}` +
-        (d.missing.length ? `  补发 ${d.missing.length}：user ${d.missing.join(", ")}` : "") +
-        (d.extra.length ? `  收回 ${d.extra.length}：user ${d.extra.join(", ")}` : ""))
-    }
-    if (lines.length) {
-      console.log(`  题单${String(r.set.id).padStart(2)} ${r.set.title}`)
-      for (const line of lines) console.log(line)
-    }
-  }
-  console.log(`\n合计：补录 ${recovered} 道题，进度 ${progressRows} 条要重算` +
-    `（完成 +${completedGain} / -${completedLoss}），奖章补发 ${missing} 条、收回 ${extra} 条`)
-
-  if (recovered === 0 && progressRows === 0 && missing === 0 && extra === 0) {
-    console.log("题单数据与当前规则一致，无需订正")
-    return 0
-  }
-  if (!options.apply) {
-    console.log("\n这是只读预演，什么都没写。确认无误后加 --apply 落库。")
-    return 0
-  }
-  if (extra > 0 && !options.allowRevoke) {
-    console.error(`\n预演里有 ${extra} 条奖章要被收回，而 user_badge 没有别处备份、` +
-      `earnedTime 删了就找不回来。\n确认要连同收回一起执行，加 --allow-revoke。`)
-    return 1
-  }
-
-  let touched = 0
-  for (const r of report) {
-    const hasBadgeDrift = r.badgeDiffs.some((d) => d.missing.length || d.extra.length)
-    if (!r.recovered && !r.changed && !hasBadgeDrift) continue
-    // 补录的格子先写进 detail，resyncProgress 是照着库里的 detail 重算的
-    if (r.recovered) {
-      await db.transaction(async (tx) => {
-        const rows = await tx.select().from(schema.problemsetProgress)
-          .where(eq(schema.problemsetProgress.problemsetId, r.set.id))
-        for (const row of rows) {
-          const detail = objectValue(row.progressDetail)
-          let dirty = false
-          for (const link of r.links) {
-            const at = r.found.get(`${row.userId}:${link.problemId}`)
-            if (!at || String(link.problemId) in detail) continue
-            detail[String(link.problemId)] = { score: r.scoreByProblem.get(link.problemId) ?? 0, submit_time: at }
-            dirty = true
-            const [existing] = await tx.select({ id: schema.problemsetSubmission.id })
-              .from(schema.problemsetSubmission).where(and(
-                eq(schema.problemsetSubmission.problemsetId, r.set.id),
-                eq(schema.problemsetSubmission.userId, row.userId),
-                eq(schema.problemsetSubmission.problemId, link.problemId),
-              )).limit(1)
-            if (!existing) {
-              const [submission] = await tx.select({ id: schema.submission.id }).from(schema.submission)
-                .where(and(
-                  eq(schema.submission.userId, row.userId),
-                  eq(schema.submission.problemId, link.problemId),
-                  isNull(schema.submission.contestId),
-                  inArray(schema.submission.result, ACCEPTED),
-                )).orderBy(schema.submission.createTime).limit(1)
-              if (submission) {
-                await tx.insert(schema.problemsetSubmission).values({
-                  problemsetId: r.set.id,
-                  userId: row.userId,
-                  submissionId: submission.id,
-                  problemId: link.problemId,
-                })
-              }
-            }
-          }
-          if (dirty) {
-            await tx.update(schema.problemsetProgress).set({ progressDetail: detail })
-              .where(eq(schema.problemsetProgress.id, row.id))
-          }
-        }
-      })
-    }
-    // 重算进度，顺带重算这份题单的全部奖章
-    await resyncProgress(r.set.id)
-    touched += 1
-  }
-  // 没有参与者、只有奖章欠账的题单不会走上面那条，兜一遍
-  for (const r of report) {
-    for (const d of r.badgeDiffs) {
-      if (d.missing.length || d.extra.length) await recalculateBadge(d.badge)
-    }
-  }
-  console.log(`\n已订正 ${touched} 个题单，复核中……`)
-
-  let remaining = 0
-  for (const set of sets) {
-    const { links, progresses, badges } = await loadSet(set.id)
-    const found = await recoverable(links, progresses)
-    if (found.size) {
-      remaining += found.size
-      console.error(`  仍有可补录的进度：题单${set.id} ${found.size} 条`)
-    }
-    for (const row of progresses) {
-      const next = computeProgress(objectValue(row.progressDetail), links, row.completeTime, now)
-      if (row.isCompleted !== next.isCompleted || row.totalScore !== next.totalScore ||
-        row.completedProblemsCount !== next.completedProblemsCount ||
-        row.totalProblemsCount !== next.totalProblemsCount) {
-        remaining += 1
-        console.error(`  进度仍不一致：题单${set.id} user ${row.userId}`)
-      }
-    }
-    for (const badge of badges) {
-      const after = await badgeHolderDiff(badge)
-      if (after.missing.length || after.extra.length) {
-        remaining += after.missing.length + after.extra.length
-        console.error(`  奖章仍不一致：题单${set.id} [${badge.name}]`, after)
-      }
-    }
-  }
-  console.log(remaining === 0 ? "复核通过：题单数据与规则一致" : `复核未通过，仍有 ${remaining} 处差异`)
-  return remaining === 0 ? 0 : 1
-}
diff --git a/apps/api/src/scripts/fix-achievement-hours.ts b/apps/api/src/scripts/fix-achievement-hours.ts
deleted file mode 100644
index f55e43b..0000000
--- a/apps/api/src/scripts/fix-achievement-hours.ts
+++ /dev/null
@@ -1,337 +0,0 @@
-import { and, eq, inArray, isNull, ne, sql } from "drizzle-orm"
-
-import { db, schema } from "../db"
-import { localTime, TIME_ZONE } from "../time"
-
-/**
- * 一次性数据对账：把「夜猫子」「早起的鸟儿」的历史发放与真实提交时间对齐。
- *
- * ## 背景
- *
- * 2026-08-26 OJ2 上线到 2026-09-14 修好时区之间，`services/achievements.ts` 用
- * `new Date(createTime).getHours()` 判定，而容器是 UTC —— 于是 **UTC 的「凌晨 0–5 点」
- * 其实是北京时间的上午 9–13 点**，学生在上课时间提交被记成熬夜；
- * 「5–7 点」对应北京下午 1–3 点，被记成早起。
- *
- * 旧 Django 栈用的是 `timezone.localtime()`（`TIME_ZONE = "Asia/Shanghai"`），
- * 所以 2022–2026.08 的历史数据**本来就是东八区口径、本来就是对的**。
- * 出问题的只有 OJ2 那两周的增量。
- *
- * ## 为什么不能只删 `user_achievement`
- *
- * `unlockAchievements()` 的判定是**纯粹的阈值比较**（`metrics[metric] >= threshold`），
- * 不是「这次有没有跨过阈值」。所以只要 `user_stat.metrics.midnight_submissions`
- * 还留着虚高的 13，把成就行删掉之后，学生**下一次提交就会原样再发一次**。
- *
- * 必须一起做：按东八区重算小时指标写回 user_stat，再对账发放。
- *
- * ## 两个方向
- *
- * - **撤回**：重算后不达标却持有 → 删行 + `achievement.unlock_count` 下调。
- * - **补发**：重算后达标却没持有 → 插行（`backfilled = true`，前端显示「已获得」
- *   而不编一个解锁时间）+ 计数上调。
- *
- * 2026-09-14 的实测结论：**只有撤回（60 条），补发 0 条** —— 原因是 OJ2 窗口内
- * 1508 条提交里，真正落在北京 0–5 点和 5–7 点的**都是 0 条**（真熬夜的人都在
- * Django 时代活跃过了）。补发分支留着是为了对称和以后重跑，不是为了现在有用。
- *
- * ## 跑法（对齐 migrate / recount：跟着二进制走，生产镜像里没有 bun 也没有源码）
- *
- *   # 本机开发
- *   bun apps/api/src/main.ts fix-achievement-hours
- *   bun apps/api/src/main.ts fix-achievement-hours --apply
- *
- *   # 服务器 / 机房（docker/ 目录下，或照 deploy.sh 用 -f 指定）
- *   docker compose -f docker/compose.debian.yml --env-file docker/.env \
- *     run --rm oj-api oj2-api fix-achievement-hours
- *   # 确认无误后再加 --apply
- *
- * ⚠️ **必须先部署时区修复，再跑这个脚本。** 反过来的话旧代码还在按 UTC 累加，
- * 跑完马上又被写脏、成就又发回来。
- *
- * ⚠️ **--apply 要挑没人做题的时候跑。** 差异在事务外算、事务内写；算完到写完之间
- * 要是学生交了一发并判完，那一笔的小时计数会被覆盖。落库后的复核会报「仍有 N 处差异」
- * 并以 1 退出，不会静默 —— 见到了重跑一次即可。
- *
- * 写回时**只动两个小时键**（jsonb `||` 合并），不整体覆盖 `metrics`：整体写回的是事务外
- * 读的快照，并发时会连带把 `submission_count` / `_last_ac_date` 等一起写旧，而复核只比
- * 小时指标，那种覆盖是查不出来的。
- *
- * 幂等：干净状态下再跑，报 0 处差异并以 0 退出。
- */
-
-/** 受时区影响的小时口径指标 —— 只有这两个 */
-const HOUR_METRICS = ["midnight_submissions", "early_bird_submissions"] as const
-
-interface Target {
-  id: number
-  name: string
-  metric: string
-  threshold: number
-  operator: string
-}
-
-interface Plan {
-  metricFixes: Array<{ id: number; userId: number; midnight: number; earlyBird: number }>
-  revoke: Array<{ userId: number; achievementId: number; name: string; held: number; actual: number }>
-  grant: Array<{ userId: number; achievementId: number; name: string; actual: number }>
-  cascade: Array<{ userId: number; achievementId: number; name: string; before: number; after: number }>
-  targets: Target[]
-  meta: Target | undefined
-  touched: number[]
-}
-
-/**
- * 只读对账：算出「该改的指标 / 该撤的 / 该补的 / 连锁该撤的」。
- * 落库之后再调一次就是复核。
- */
-async function audit(): Promise<Plan> {
-  // 用 SQL 一次算完，口径和 apps/api/src/time.ts 完全一致（东八区墙上时钟的钟点）。
-  // 只统计非比赛提交 —— 和 updateAchievementsForSubmission 的 contestId !== null 提前返回对齐。
-  const hour = sql`extract(hour from ${localTime(schema.submission.createTime)})`
-  const recomputed = await db
-    .select({
-      userId: schema.submission.userId,
-      midnight: sql<number>`count(*) filter (where ${hour} < 5)`.mapWith(Number),
-      earlyBird: sql<number>`count(*) filter (where ${hour} >= 5 and ${hour} < 7)`.mapWith(Number),
-    })
-    .from(schema.submission)
-    .where(isNull(schema.submission.contestId))
-    .groupBy(schema.submission.userId)
-  const truth = new Map(recomputed.map((row) => [row.userId, row]))
-  const actualOf = (userId: number, metric: string) => {
-    const fresh = truth.get(userId)
-    return (metric === "midnight_submissions" ? fresh?.midnight : fresh?.earlyBird) ?? 0
-  }
-
-  // 哪些 user_stat 的小时指标要改
-  const stats = await db.select().from(schema.userStat)
-  const statByUser = new Map(stats.map((row) => [row.userId, row]))
-  const metricFixes: Plan["metricFixes"] = []
-  for (const row of stats) {
-    const fresh = truth.get(row.userId)
-    const corrected = { midnight_submissions: fresh?.midnight ?? 0, early_bird_submissions: fresh?.earlyBird ?? 0 }
-    const changed = HOUR_METRICS.filter((key) => (row.metrics as Record<string, unknown>)[key] !== corrected[key])
-    if (changed.length) {
-      metricFixes.push({ id: row.id, userId: row.userId, midnight: corrected.midnight_submissions, earlyBird: corrected.early_bird_submissions })
-    }
-  }
-
-  const targets = await db
-    .select({
-      id: schema.achievement.id,
-      name: schema.achievement.name,
-      metric: schema.achievement.metric,
-      threshold: schema.achievement.threshold,
-      operator: schema.achievement.operator,
-    })
-    .from(schema.achievement)
-    .where(and(eq(schema.achievement.visible, true), inArray(schema.achievement.metric, [...HOUR_METRICS])))
-  const targetById = new Map(targets.map((item) => [item.id, item]))
-  const met = (target: Target, userId: number) => {
-    const value = actualOf(userId, target.metric)
-    return target.operator === "gte" ? value >= target.threshold : value <= target.threshold
-  }
-
-  const grants = await db
-    .select({ achievementId: schema.userAchievement.achievementId, userId: schema.userAchievement.userId })
-    .from(schema.userAchievement)
-    .where(inArray(schema.userAchievement.achievementId, targets.map((item) => item.id)))
-  const heldByUser = new Map<number, Set<number>>()
-  for (const grant of grants) {
-    heldByUser.set(grant.userId, (heldByUser.get(grant.userId) ?? new Set()).add(grant.achievementId))
-  }
-
-  const revoke: Plan["revoke"] = []
-  for (const grant of grants) {
-    const target = targetById.get(grant.achievementId)
-    if (!target || met(target, grant.userId)) continue
-    revoke.push({
-      userId: grant.userId,
-      achievementId: grant.achievementId,
-      name: target.name,
-      held: Number((statByUser.get(grant.userId)?.metrics as Record<string, unknown> | undefined)?.[target.metric] ?? 0),
-      actual: actualOf(grant.userId, target.metric),
-    })
-  }
-
-  // 补发只针对「被成就系统结算过」的用户（有 user_stat 行）—— 从没结算过的是另一件事
-  // （备份里还有 31 个有提交却没有 user_stat 行的用户），不在这个脚本的职责内。
-  const grant: Plan["grant"] = []
-  for (const target of targets) {
-    for (const userId of truth.keys()) {
-      if (!statByUser.has(userId)) continue
-      if (heldByUser.get(userId)?.has(target.id)) continue
-      if (!met(target, userId)) continue
-      grant.push({ userId, achievementId: target.id, name: target.name, actual: actualOf(userId, target.metric) })
-    }
-  }
-
-  // 连锁：`achievement_unlocked_count` = 「已解锁的非白金成就数」，是 奖杯收藏家 的判据。
-  // 撤回会让它降、补发会让它升；降破了阈值的 奖杯收藏家 要一起撤。
-  const touched = [...new Set([...revoke.map((item) => item.userId), ...grant.map((item) => item.userId)])]
-  const meta = (
-    await db
-      .select({
-        id: schema.achievement.id,
-        name: schema.achievement.name,
-        metric: schema.achievement.metric,
-        threshold: schema.achievement.threshold,
-        operator: schema.achievement.operator,
-      })
-      .from(schema.achievement)
-      .where(and(eq(schema.achievement.visible, true), eq(schema.achievement.metric, "achievement_unlocked_count")))
-  )[0]
-
-  const cascade: Plan["cascade"] = []
-  if (meta && touched.length) {
-    const unlocked = await db
-      .select({
-        userId: schema.userAchievement.userId,
-        achievementId: schema.userAchievement.achievementId,
-        rarity: schema.achievement.rarity,
-      })
-      .from(schema.userAchievement)
-      .innerJoin(schema.achievement, eq(schema.userAchievement.achievementId, schema.achievement.id))
-    const held = new Map<number, Array<{ achievementId: number; rarity: string }>>()
-    for (const row of unlocked) {
-      const list = held.get(row.userId) ?? []
-      list.push({ achievementId: row.achievementId, rarity: row.rarity })
-      held.set(row.userId, list)
-    }
-    for (const userId of touched) {
-      const mine = held.get(userId) ?? []
-      const gone = new Set(revoke.filter((item) => item.userId === userId).map((item) => item.achievementId))
-      const coming = new Set(grant.filter((item) => item.userId === userId).map((item) => item.achievementId))
-      const before = mine.filter((item) => item.rarity !== "platinum").length
-      const after = mine.filter((item) => item.rarity !== "platinum" && !gone.has(item.achievementId)).length + coming.size
-      if (before === after) continue
-      const holdsMeta = mine.some((item) => item.achievementId === meta.id)
-      const ok = meta.operator === "gte" ? after >= meta.threshold : after <= meta.threshold
-      if (holdsMeta && !ok) cascade.push({ userId, achievementId: meta.id, name: meta.name, before, after })
-    }
-  }
-
-  return { metricFixes, revoke, grant, cascade, targets, meta, touched }
-}
-
-function report(plan: Plan) {
-  console.log(`① 需要修正小时指标的 user_stat 行：${plan.metricFixes.length}`)
-  console.log(`② 需要【撤回】的发放：${plan.revoke.length} 条，涉及 ${new Set(plan.revoke.map((r) => r.userId)).size} 人`)
-  for (const target of plan.targets) {
-    console.log(`     - ${target.name}（阈值 ${target.operator} ${target.threshold}）：${plan.revoke.filter((r) => r.achievementId === target.id).length} 条`)
-  }
-  console.log(`③ 需要【补发】的发放：${plan.grant.length} 条，涉及 ${new Set(plan.grant.map((r) => r.userId)).size} 人`)
-  for (const target of plan.targets) {
-    console.log(`     - ${target.name}：${plan.grant.filter((r) => r.achievementId === target.id).length} 条`)
-  }
-  console.log(`④ 连带需要撤销的「${plan.meta?.name ?? "(未配置)"}」：${plan.cascade.length} 条`)
-  if (plan.revoke.length <= 40) {
-    for (const item of plan.revoke) console.log(`       [撤] user ${item.userId}  ${item.name}  存量 ${item.held} → 实际 ${item.actual}`)
-  }
-  if (plan.grant.length <= 40) {
-    for (const item of plan.grant) console.log(`       [补] user ${item.userId}  ${item.name}  实际 ${item.actual}`)
-  }
-  for (const item of plan.cascade) console.log(`       [撤] user ${item.userId}  ${item.name}  已解锁数 ${item.before} → ${item.after}`)
-}
-
-export async function fixAchievementHours({ apply }: { apply: boolean }): Promise<number> {
-  const url = process.env.DATABASE_URL ?? "postgres://onlinejudge:onlinejudge@localhost:5433/onlinejudge"
-  const database = (() => {
-    try {
-      const parsed = new URL(url)
-      return `${parsed.host}${parsed.pathname}`
-    } catch {
-      return "(无法解析)"
-    }
-  })()
-  console.log(`目标库：${database}`)
-  console.log(`模式：${apply ? "【真写】" : "只读预演（不改任何数据）"}`)
-  console.log(`时区锚点：${TIME_ZONE}\n`)
-
-  const plan = await audit()
-  report(plan)
-  if (!plan.metricFixes.length && !plan.revoke.length && !plan.grant.length && !plan.cascade.length) {
-    console.log("\n复核通过：发放与真实提交时间一致，无需修改。")
-    return 0
-  }
-  if (!apply) {
-    console.log("\n（只读预演结束。确认无误后加 --apply。）")
-    return 0
-  }
-
-  const { metricFixes, revoke, grant, cascade, targets, meta, touched } = plan
-  await db.transaction(async (tx) => {
-    for (const fix of metricFixes) {
-      // 只合并两个小时键，其余指标以库里当下的值为准（见文件头「只动两个小时键」）
-      await tx
-        .update(schema.userStat)
-        .set({
-          metrics: sql`${schema.userStat.metrics} || jsonb_build_object('midnight_submissions', ${fix.midnight}::int, 'early_bird_submissions', ${fix.earlyBird}::int)`,
-        })
-        .where(eq(schema.userStat.id, fix.id))
-    }
-    for (const target of targets) {
-      const ids = revoke.filter((item) => item.achievementId === target.id).map((item) => item.userId)
-      if (ids.length) {
-        await tx
-          .delete(schema.userAchievement)
-          .where(and(eq(schema.userAchievement.achievementId, target.id), inArray(schema.userAchievement.userId, ids)))
-        await tx
-          .update(schema.achievement)
-          .set({ unlockCount: sql`greatest(${schema.achievement.unlockCount} - ${ids.length}, 0)` })
-          .where(eq(schema.achievement.id, target.id))
-      }
-      // backfilled = true：这是事后对账补的，不编一个假的解锁时间；前端因此显示「已获得」
-      const rows = grant
-        .filter((item) => item.achievementId === target.id)
-        .map((item) => ({ userId: item.userId, achievementId: target.id, unlockTime: new Date().toISOString(), backfilled: true, notified: false }))
-      if (rows.length) {
-        await tx.insert(schema.userAchievement).values(rows)
-        await tx
-          .update(schema.achievement)
-          .set({ unlockCount: sql`${schema.achievement.unlockCount} + ${rows.length}` })
-          .where(eq(schema.achievement.id, target.id))
-      }
-    }
-    for (const item of cascade) {
-      await tx
-        .delete(schema.userAchievement)
-        .where(and(eq(schema.userAchievement.achievementId, item.achievementId), eq(schema.userAchievement.userId, item.userId)))
-      await tx
-        .update(schema.achievement)
-        .set({ unlockCount: sql`greatest(${schema.achievement.unlockCount} - 1, 0)` })
-        .where(eq(schema.achievement.id, item.achievementId))
-    }
-    // 最后把 achievement_unlocked_count 校正成「对账之后实际持有的非白金数」
-    if (meta && touched.length) {
-      const fresh = await tx
-        .select({ userId: schema.userAchievement.userId, value: sql<number>`count(*)`.mapWith(Number) })
-        .from(schema.userAchievement)
-        .innerJoin(schema.achievement, eq(schema.userAchievement.achievementId, schema.achievement.id))
-        .where(and(inArray(schema.userAchievement.userId, touched), ne(schema.achievement.rarity, "platinum")))
-        .groupBy(schema.userAchievement.userId)
-      const byUser = new Map(fresh.map((row) => [row.userId, row.value]))
-      for (const userId of touched) {
-        await tx
-          .update(schema.userStat)
-          .set({
-            metrics: sql`jsonb_set(${schema.userStat.metrics}, '{achievement_unlocked_count}', ${JSON.stringify(byUser.get(userId) ?? 0)}::jsonb)`,
-          })
-          .where(eq(schema.userStat.userId, userId))
-      }
-    }
-  })
-  console.log(`\n已订正指标 ${metricFixes.length} 行、撤回 ${revoke.length} 条、补发 ${grant.length} 条、连锁撤销 ${cascade.length} 条，复核中……`)
-
-  // 复核跑的是同一份 audit。还剩差异说明口径或并发写入了，必须让调用方看见非零退出码。
-  const after = await audit()
-  const left = after.metricFixes.length + after.revoke.length + after.grant.length + after.cascade.length
-  if (left === 0) {
-    console.log("复核通过：发放与真实提交时间一致。")
-    return 0
-  }
-  console.error(`复核未通过，仍有 ${left} 处差异（多半是算完到写完之间有新提交判完，重跑一次即可）：`)
-  report(after)
-  return 1
-}
diff --git a/apps/api/src/scripts/recount.ts b/apps/api/src/scripts/recount.ts
index d068a4e..b5ad75f 100644
--- a/apps/api/src/scripts/recount.ts
+++ b/apps/api/src/scripts/recount.ts
@@ -24,7 +24,7 @@ import { metaAchievements, refreshUnlockedCount, rescanAchievement } from "../se
  *
  * **不管**的：acm_contest_rank（比赛榜有自己的一套罚时累计，重算要连带 submission_info
  * 里每题的尝试次数，口径复杂，单独一件事）、achievement.unlock_count（0010 之后
- * user_achievement 随成就级联，漂不了）、题单进度与奖章（走 backfill-problemsets）。
+ * user_achievement 随成就级联，漂不了）、题单进度与奖章（判题这一路自己记账，见 services/problemset.ts）。
  *
  * 默认只读，把差异打出来；确认无误再加 --apply 落库。跑法对齐 migrate：
  *
diff --git a/apps/api/src/services/problemset.ts b/apps/api/src/services/problemset.ts
index 71bcfd4..70fae59 100644
--- a/apps/api/src/services/problemset.ts
+++ b/apps/api/src/services/problemset.ts
@@ -193,24 +193,6 @@ export async function resyncProgress(problemsetId: number) {
   for (const badge of badges) await recalculateBadge(badge, updated)
 }
 
-/** 按奖章算出「现在应该有谁」，只读，供补发脚本先看后写 */
-export async function badgeHolderDiff(badge: BadgeRow, known?: (BadgeCheck & { userId: number })[]) {
-  const [progresses, holders] = await Promise.all([
-    known ?? db.select().from(schema.problemsetProgress)
-      .where(eq(schema.problemsetProgress.problemsetId, badge.problemsetId)),
-    db.select({ userId: schema.userBadge.userId }).from(schema.userBadge)
-      .where(eq(schema.userBadge.badgeId, badge.id)),
-  ])
-  const eligible = new Set(progresses.filter((item) => eligibleForBadge(badge, item)).map((item) => item.userId))
-  const have = new Set(holders.map((item) => item.userId))
-  return {
-    missing: [...eligible].filter((id) => !have.has(id)),
-    extra: [...have].filter((id) => !eligible.has(id)),
-    eligible: eligible.size,
-    held: have.size,
-  }
-}
-
 /**
  * 判题通过后，把这道题记进该用户所有「已加入且包含这道题」的题单。
  *
@@ -222,8 +204,6 @@ export async function badgeHolderDiff(badge: BadgeRow, known?: (BadgeCheck & { u
  * 挪到判题这一路之后，记账和判题在同一个事务链里，前端只管显示。
  *
  * 不按 visible / status 过滤：进度是学生自己的记录，老师把题单藏起来不该让它停止累积。
- * 更要紧的是这条规则必须和补账那条（scripts/backfill-problemsets.ts）一致 ——
- * 两边口径不一样的话，补账工具会永远「发现」差异。
  */
 export async function recordSolvedProblem(
   userId: number,