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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-- 学生从「账号」变成「名单记录」：新建 Student 表，个人数据外键改指向它
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--
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-- 为什么要有这一版：
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-- 在此之前学生是 `User` 表里 role='STUDENT' 的行 —— 与教师登录名共用同一个全局唯一
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-- 命名空间、靠 passwordHash='' 占位、靠"登录时先判 role 再 403"来阻止登录。
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-- 「学生不是账号」这条不变量只靠约定维持，任何一处漏判都会让一个学生变成可登录账号。
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-- 本迁移把它变成**结构性保证**：学生只存在于 Student 表，那里没有 passwordHash、没有 role。
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--
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-- 语义变化：
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-- 1) `User` 收缩为纯账号表（ADMIN / TEACHER / CLASS_DEVICE），去掉 classId 与 role='STUDENT'；
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-- 2) `Student.studentNo`（学号）= 原 `User.username`，是学生唯一标识与查询键；
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-- 3) `Grade.userId` / `HomeworkStatus.userId` / `NotificationRead.userId` → `studentId`，
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-- 指向 Student（值就是原来那个 User.id，因此历史数据一条不丢）；
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-- 4) 删除 `Enrollment`（`Student.classId` 已是唯一归属，两处双写必然漂移）
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-- 与 `ClassTeacher`（没有科目的协作关系；任课关系的唯一来源改为 `Course.teacherId`）；
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-- 5) `User.phone`（教师联系方式）。
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--
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-- 数据保全：
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-- - 学生行按 id 原样搬进 Student，因此 Grade / HomeworkStatus / NotificationRead 里
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-- 旧 `userId` 直接就是新的 `studentId`，无需任何映射表；
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-- - 三张个人数据表回填时用 `IN (SELECT id FROM Student)` 兜底：历史上若有教师/管理员
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-- 误留下个人记录（例如教师给自己勾过作业完成），这些行会被丢弃而不是撞外键失败；
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-- - 成绩的 `level` 按旧口径（得分率）回填，保持升级后界面显示不变。
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-- DropIndex
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DROP INDEX "ClassTeacher_classId_teacherId_key";
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DROP INDEX "ClassTeacher_teacherId_idx";
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DROP INDEX "Enrollment_userId_classId_key";
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DROP INDEX "Enrollment_classId_idx";
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-- DropTable
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PRAGMA foreign_keys=off;
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DROP TABLE "ClassTeacher";
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DROP TABLE "Enrollment";
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PRAGMA foreign_keys=on;
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-- CreateTable
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CREATE TABLE "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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"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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);
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-- 把原「学生账号」整行搬成名单记录：id 保持不变，这样下面三张表的 userId 可以直接当 studentId 用。
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INSERT INTO "Student" ("id", "studentNo", "name", "classId", "gender", "guardianPhone", "status", "createdAt", "updatedAt")
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SELECT "id", "username", "name", "classId", '', '', 'active', "createdAt", "updatedAt"
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FROM "User"
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WHERE "role" = 'STUDENT';
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CREATE TABLE "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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"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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-- 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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"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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"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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);
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INSERT INTO "new_Class" ("code", "createdAt", "grade", "id", "name", "notificationChannel", "passwordHash", "teacherId", "termWeeks", "updatedAt") SELECT "code", "createdAt", "grade", "id", "name", "notificationChannel", "passwordHash", "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 TABLE "new_Grade" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"classId" TEXT NOT NULL,
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"courseId" TEXT,
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"studentId" TEXT NOT NULL,
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"examName" TEXT NOT NULL,
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"score" REAL NOT NULL,
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"totalScore" REAL NOT NULL DEFAULT 100,
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"publishedAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"createdAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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"updatedAt" DATETIME NOT NULL,
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CONSTRAINT "Grade_classId_fkey" FOREIGN KEY ("classId") REFERENCES "Class" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT "Grade_courseId_fkey" FOREIGN KEY ("courseId") REFERENCES "Course" ("id") ON DELETE SET NULL ON UPDATE CASCADE,
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CONSTRAINT "Grade_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_Grade" ("classId", "courseId", "createdAt", "examName", "id", "publishedAt", "score", "studentId", "totalScore", "updatedAt")
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SELECT "classId", "courseId", "createdAt", "examName", "id", "publishedAt", "score", "userId", "totalScore", "updatedAt"
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FROM "Grade"
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WHERE "userId" IN (SELECT "id" FROM "Student");
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DROP TABLE "Grade";
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ALTER TABLE "new_Grade" RENAME TO "Grade";
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CREATE INDEX "Grade_studentId_publishedAt_idx" ON "Grade"("studentId", "publishedAt");
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CREATE INDEX "Grade_classId_examName_idx" ON "Grade"("classId", "examName");
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CREATE INDEX "Grade_courseId_idx" ON "Grade"("courseId");
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CREATE TABLE "new_HomeworkStatus" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"homeworkId" TEXT NOT NULL,
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"studentId" TEXT NOT NULL,
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"completed" BOOLEAN NOT NULL DEFAULT false,
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"updatedAt" DATETIME NOT NULL,
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CONSTRAINT "HomeworkStatus_homeworkId_fkey" FOREIGN KEY ("homeworkId") REFERENCES "Homework" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT "HomeworkStatus_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_HomeworkStatus" ("completed", "homeworkId", "id", "studentId", "updatedAt")
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SELECT "completed", "homeworkId", "id", "userId", "updatedAt"
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FROM "HomeworkStatus"
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WHERE "userId" IN (SELECT "id" FROM "Student");
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DROP TABLE "HomeworkStatus";
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ALTER TABLE "new_HomeworkStatus" RENAME TO "HomeworkStatus";
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CREATE INDEX "HomeworkStatus_studentId_idx" ON "HomeworkStatus"("studentId");
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CREATE UNIQUE INDEX "HomeworkStatus_homeworkId_studentId_key" ON "HomeworkStatus"("homeworkId", "studentId");
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CREATE TABLE "new_NotificationRead" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"notificationId" TEXT NOT NULL,
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"studentId" TEXT NOT NULL,
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"readAt" DATETIME NOT NULL DEFAULT CURRENT_TIMESTAMP,
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CONSTRAINT "NotificationRead_notificationId_fkey" FOREIGN KEY ("notificationId") REFERENCES "Notification" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
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CONSTRAINT "NotificationRead_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_NotificationRead" ("id", "notificationId", "readAt", "studentId")
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SELECT "id", "notificationId", "readAt", "userId"
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FROM "NotificationRead"
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WHERE "userId" IN (SELECT "id" FROM "Student");
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DROP TABLE "NotificationRead";
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ALTER TABLE "new_NotificationRead" RENAME TO "NotificationRead";
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CREATE INDEX "NotificationRead_studentId_idx" ON "NotificationRead"("studentId");
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CREATE UNIQUE INDEX "NotificationRead_notificationId_studentId_key" ON "NotificationRead"("notificationId", "studentId");
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-- User 收缩成纯账号表：只留 ADMIN / TEACHER（+ 未来的 CLASS_DEVICE），去掉 classId，加 phone。
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-- 学生行在这里被丢弃 —— 它们已经在上面搬进 Student 了。
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CREATE TABLE "new_User" (
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"id" TEXT NOT NULL PRIMARY KEY,
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"username" TEXT NOT NULL,
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"passwordHash" TEXT NOT NULL,
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"name" TEXT NOT NULL,
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"role" TEXT NOT NULL DEFAULT 'TEACHER',
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"phone" 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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);
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INSERT INTO "new_User" ("createdAt", "id", "name", "passwordHash", "role", "updatedAt", "username")
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SELECT "createdAt", "id", "name", "passwordHash", "role", "updatedAt", "username"
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FROM "User"
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WHERE "role" <> 'STUDENT';
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DROP TABLE "User";
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ALTER TABLE "new_User" RENAME TO "User";
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CREATE UNIQUE INDEX "User_username_key" ON "User"("username");
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CREATE INDEX "User_role_idx" ON "User"("role");
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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 "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 "StudentClassTransfer_studentId_createdAt_idx" ON "StudentClassTransfer"("studentId", "createdAt");
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CREATE INDEX "StudentClassTransfer_createdAt_idx" ON "StudentClassTransfer"("createdAt");
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CREATE INDEX "Course_teacherId_idx" ON "Course"("teacherId");
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