feat(shared,server,web,client,plugin)!: 角色与权限重构 + 学期周次 + 课表方向反转（1.2.0）
学生、任课关系、周次口径三处长期靠约定维持的事情，改为由数据模型保证。 学生不是账号 - 拆出独立 Student 表，没有 passwordHash / role / 任何登录字段 - 「学生不能登录」由表结构保证，不再靠「登录前判 role 再 403」的代码分支 - 三张个人数据表外键 userId → studentId；删掉 Enrollment 与 ClassTeacher - 学生一律称「学号」、教师一律称「工号」，「学生账号」这个概念消失 任课关系唯一来源 = Course（班级 + 科目 + 教师） - 班主任 = Class.teacherId，科任 = Course.teacherId，同一人两处指向同一账号、不重复建号 - 作业与成绩按科目再收一道：挂科目只由该科任课老师改，没挂科目归班主任 / 管理员 - 新增「任课教师分配」与「班级教师批量导入」（带「使用工号匹配」开关） 成绩与名单 - 成绩等级：百分制 / 等级制 A·B·C·D / 自定义，支持单个与批量改等级 - 按学号查成绩明细（教师端 + 班级端 + 设备令牌），受按班开关控制 - 调班 / 转出（单个与批量）+ 可查历史；学号不变、历史作业成绩留原归属 - 毕业归档页（按年度记录毕业班级 / 毕业生 / 转出学生 / 该届通知与作业） - 学年升级（未毕业不归档、数据沿用）；班级称呼改为「2026级1班」 ClassHelper 班级端在线状态 - Web 端显示 班级 / 设备名 / 设备号 / 在线离线 / 最后在线 / 最后心跳 - lastHeartbeatAt 驱动 60 秒在线窗口，与只表示「带状态上报」的 lastSeenAt 分开 学期周次 - 新增 TermWeek（classId 空串 = 全校默认），管理员可用日期范围选择器逐周配置 - 一键按开学日期生成整学期；联网拉取调休建议（只给建议、不改数据，无外网失败属正常） - 改周次后随课表下发给教室的 ClassHelper 班级端 课表方向反转 - 主方向改为「服务端 → 教室」自动下发；教室不再自动回传 - 取教室课表改为手动动作（点击前弹警告），插件按待办标记在下一次心跳补报 改名 - 班级小助手 → ClassHelper：界面、窗口标题、托盘、灵动岛、EXE、安装包、 安装目录、systemd 描述、插件清单与设置页、官网、文档站、README BREAKING CHANGE: 产品名与 EXE 名变更（班级小助手.exe → ClassHelper.exe）， 安装目录随之改变，不支持覆盖安装，需先卸载旧版。 服务端首次启动会自动应用 6 个数据库迁移（学生行按 id 原样搬迁，历史数据不丢）， 升级前请先备份。
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-- 毕业归档：届别档案 + 班级/学生的归档标记
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--
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-- 背景（需求）：管理员要有一个「归档」页，按**年度**记录毕业的班级与学生、当年转出的学生，
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-- 以及毕业班级发过的作业与通知；**未毕业而升级的班级不归档、数据沿用**。
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--
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-- 关键设计：**归档是打标记 + 只读，不删任何数据**。
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-- `ArchivedYear` 是届别档案（入学年份 + 毕业年份 + 归档时的统计快照）；
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-- `Class.archivedYearId` / `Student.archivedYearId` 指向它，常规列表据此过滤掉归档项；
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-- 毕业班级的作业与通知原样留在库里（`Homework.classId` / `Notification.classId` 不变），
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-- 归档详情页只读地查它们 —— 「记录每个年度毕业班级的消息和作业」就是这么满足的。
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--
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-- 升级 ≠ 归档：高一 → 高二 只改 `Class.grade`，班级记录、学生名单、作业成绩全部沿用，
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-- 不碰 archivedYearId。因此归档只能由管理员在归档页显式执行。
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--
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-- 班级称呼改成「XXXX级X班」：新列 `enrollmentYear`（入学年份）+ `classIndex`（班号），
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-- `Class.name` 由服务端按二者生成。下面会对**已有班级**做一次尽力而为的推断回填。
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-- CreateTable
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CREATE TABLE "ArchivedYear" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"enrollmentYear" INTEGER NOT NULL,
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"graduationYear" INTEGER NOT NULL,
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"name" TEXT NOT NULL,
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"note" TEXT NOT NULL DEFAULT '',
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"operatorId" TEXT,
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"operatorName" TEXT NOT NULL DEFAULT '',
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"classCount" INTEGER NOT NULL DEFAULT 0,
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"studentCount" INTEGER NOT NULL DEFAULT 0,
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"transferredCount" INTEGER NOT NULL DEFAULT 0,
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"homeworkCount" INTEGER NOT NULL DEFAULT 0,
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"notificationCount" INTEGER NOT NULL DEFAULT 0,
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"archivedAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP
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);
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-- RedefineTables
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PRAGMA defer_foreign_keys=ON;
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PRAGMA foreign_keys=OFF;
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CREATE TABLE "new_Class" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"name" TEXT NOT NULL,
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"grade" TEXT NOT NULL,
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"enrollmentYear" INTEGER,
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"classIndex" INTEGER,
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"teacherId" TEXT NOT NULL,
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"code" TEXT NOT NULL,
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"passwordHash" TEXT,
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"termWeeks" INTEGER NOT NULL DEFAULT 20,
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"notificationChannel" TEXT NOT NULL DEFAULT 'both',
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"studentGradeQueryEnabled" BOOLEAN NOT NULL DEFAULT true,
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"archivedYearId" TEXT,
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"archivedAt" DATETIME,
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"createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"updatedAt" DATETIME NOT NULL,
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CONSTRAINT "Class_teacherId_fkey" FOREIGN KEY ("teacherId") REFERENCES "User" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT "Class_archivedYearId_fkey" FOREIGN KEY ("archivedYearId") REFERENCES "ArchivedYear" ("id") ON DELETE SET NULL ON UPDATE CASCADE
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);
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INSERT INTO "new_Class" ("code", "createdAt", "grade", "id", "name", "notificationChannel", "passwordHash", "studentGradeQueryEnabled", "teacherId", "termWeeks", "updatedAt") SELECT "code", "createdAt", "grade", "id", "name", "notificationChannel", "passwordHash", "studentGradeQueryEnabled", "teacherId", "termWeeks", "updatedAt" FROM "Class";
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DROP TABLE "Class";
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ALTER TABLE "new_Class" RENAME TO "Class";
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CREATE UNIQUE INDEX "Class_code_key" ON "Class"("code");
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CREATE INDEX "Class_teacherId_idx" ON "Class"("teacherId");
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CREATE INDEX "Class_enrollmentYear_idx" ON "Class"("enrollmentYear");
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CREATE INDEX "Class_archivedYearId_idx" ON "Class"("archivedYearId");
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-- 已有班级的届别推断（尽力而为）：
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-- 入学年份 = 当前学年起始年 − 该班现在的年级偏移。学年在 9 月切换，
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-- 所以 9 月及以后算今年起始、之前算去年起始；高一偏移 0、高二 1、高三 2，
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-- 认不出的年级（初中 / 四年制等）按高三处理（宁可偏早，管理员可在班级管理页改正）。
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UPDATE "Class"
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SET "enrollmentYear" = (
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CASE WHEN CAST(strftime('%m', 'now') AS INTEGER) >= 9
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THEN CAST(strftime('%Y', 'now') AS INTEGER)
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ELSE CAST(strftime('%Y', 'now') AS INTEGER) - 1 END
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) - CASE "grade" WHEN '高二' THEN 1 WHEN '高三' THEN 2 ELSE 0 END
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WHERE "enrollmentYear" IS NULL;
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-- 班号按「同一届内按创建先后」编号（老名字里的括号数字没法跨库 reliably 解析，这是等价的近似）。
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UPDATE "Class"
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SET "classIndex" = (
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SELECT COUNT(*) FROM "Class" c2
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WHERE c2."enrollmentYear" = "Class"."enrollmentYear"
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AND (c2."createdAt" < "Class"."createdAt"
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OR (c2."createdAt" = "Class"."createdAt" AND c2."id" <= "Class"."id"))
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)
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WHERE "classIndex" IS NULL;
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-- 按新口径重写称呼：「2026级1班」。管理员若觉得推断不对，可在班级管理页改入学年份/班号。
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UPDATE "Class"
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SET "name" = CAST("enrollmentYear" AS TEXT) || '级' || CAST("classIndex" AS TEXT) || '班'
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WHERE "enrollmentYear" IS NOT NULL AND "classIndex" IS NOT NULL;
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CREATE TABLE "new_Student" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"studentNo" TEXT NOT NULL,
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"name" TEXT NOT NULL,
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"classId" TEXT,
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"gender" TEXT NOT NULL DEFAULT '',
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"guardianPhone" TEXT NOT NULL DEFAULT '',
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"status" TEXT NOT NULL DEFAULT 'active',
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"archivedYearId" TEXT,
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"archivedAt" DATETIME,
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"transferredAt" DATETIME,
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"transferNote" TEXT NOT NULL DEFAULT '',
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"createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"updatedAt" DATETIME NOT NULL,
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CONSTRAINT "Student_classId_fkey" FOREIGN KEY ("classId") REFERENCES "Class" ("id") ON DELETE SET NULL ON UPDATE CASCADE,
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CONSTRAINT "Student_archivedYearId_fkey" FOREIGN KEY ("archivedYearId") REFERENCES "ArchivedYear" ("id") ON DELETE SET NULL ON UPDATE CASCADE
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);
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INSERT INTO "new_Student" ("classId", "createdAt", "gender", "guardianPhone", "id", "name", "status", "studentNo", "updatedAt") SELECT "classId", "createdAt", "gender", "guardianPhone", "id", "name", "status", "studentNo", "updatedAt" FROM "Student";
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DROP TABLE "Student";
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ALTER TABLE "new_Student" RENAME TO "Student";
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CREATE UNIQUE INDEX "Student_studentNo_key" ON "Student"("studentNo");
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CREATE INDEX "Student_classId_idx" ON "Student"("classId");
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CREATE INDEX "Student_name_idx" ON "Student"("name");
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CREATE INDEX "Student_status_idx" ON "Student"("status");
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CREATE INDEX "Student_archivedYearId_idx" ON "Student"("archivedYearId");
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CREATE TABLE "new_StudentClassTransfer" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"studentId" TEXT NOT NULL,
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"studentNo" TEXT NOT NULL,
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"studentName" TEXT NOT NULL,
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"fromClassId" TEXT,
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"fromClassName" TEXT NOT NULL DEFAULT '',
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"toClassId" TEXT,
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"toClassName" TEXT NOT NULL DEFAULT '',
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"operatorId" TEXT,
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"operatorName" TEXT NOT NULL DEFAULT '',
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"mode" TEXT NOT NULL DEFAULT 'single',
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"note" TEXT NOT NULL DEFAULT '',
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"createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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CONSTRAINT "StudentClassTransfer_studentId_fkey" FOREIGN KEY ("studentId") REFERENCES "Student" ("id") ON DELETE CASCADE ON UPDATE CASCADE
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);
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INSERT INTO "new_StudentClassTransfer" ("createdAt", "fromClassId", "fromClassName", "id", "mode", "operatorId", "operatorName", "studentId", "studentName", "studentNo", "toClassId", "toClassName") SELECT "createdAt", "fromClassId", "fromClassName", "id", "mode", "operatorId", "operatorName", "studentId", "studentName", "studentNo", "toClassId", "toClassName" FROM "StudentClassTransfer";
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DROP TABLE "StudentClassTransfer";
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ALTER TABLE "new_StudentClassTransfer" RENAME TO "StudentClassTransfer";
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CREATE INDEX "StudentClassTransfer_studentId_createdAt_idx" ON "StudentClassTransfer"("studentId", "createdAt");
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CREATE INDEX "StudentClassTransfer_createdAt_idx" ON "StudentClassTransfer"("createdAt");
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PRAGMA foreign_keys=ON;
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PRAGMA defer_foreign_keys=OFF;
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-- CreateIndex
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CREATE UNIQUE INDEX "ArchivedYear_enrollmentYear_key" ON "ArchivedYear"("enrollmentYear");
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