refactor: replace UserDingMapping with StudentDingMapping entity

apps/server/src/entities/index.ts

@@ -35,4 +35,4 @@ export { LearningRecord } from './learning-record.entity';
 export { ResultArchive } from './result-archive.entity';
 export { ArchiveAttachment } from './archive-attachment.entity';
 export { StudentReport } from './student-report.entity';
-export { UserDingMapping } from './user-ding-mapping.entity';
+export { StudentDingMapping } from './student-ding-mapping.entity';

apps/server/src/entities/student-ding-mapping.entity.ts

@@ -0,0 +1,24 @@
+import {
+  Entity, PrimaryGeneratedColumn, Column, CreateDateColumn,
+  ManyToOne, JoinColumn,
+} from 'typeorm';
+import { Student } from './student.entity';
+
+@Entity('student_ding_mapping')
+export class StudentDingMapping {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'ding_user_id', length: 100, unique: true })
+  dingUserId: string;
+
+  @Column({ name: 'student_id', type: 'integer', unique: true })
+  studentId: number;
+
+  @ManyToOne(() => Student, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'student_id' })
+  student: Student;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+}

apps/server/src/entities/user-ding-mapping.entity.ts

@@ -1,52 +0,0 @@
-import {
-  Entity,
-  PrimaryGeneratedColumn,
-  Column,
-  CreateDateColumn,
-  UpdateDateColumn,
-  Index,
-  ManyToOne,
-  JoinColumn,
-} from 'typeorm';
-import { User } from './user.entity';
-
-/**
- * Maps DingTalk user IDs to local User records.
- * Used for incremental sync and attendance auto-matching.
- *
- * Mapping chain:
- *   dingtalk userid → UserDingMapping.dingUserId → UserDingMapping.userId
- *   → User.id → Student.userId → Student.id
- *   → DingAttendanceRaw.dingUserId → UserDingMapping.dingUserId → auto-match
- */
-@Entity('user_ding_mapping')
-export class UserDingMapping {
-  @PrimaryGeneratedColumn()
-  id: number;
-
-  /** DingTalk user ID (from DingTalk API) */
-  @Column({ name: 'ding_user_id', length: 100, unique: true })
-  dingUserId: string;
-
-  /** Local User ID */
-  @Column({ name: 'user_id', type: 'integer', unique: true })
-  userId: number;
-
-  @ManyToOne(() => User, { onDelete: 'CASCADE' })
-  @JoinColumn({ name: 'user_id' })
-  user: User;
-
-  /** DingTalk user name (cached for display) */
-  @Column({ name: 'ding_name', length: 100, nullable: true })
-  dingName: string;
-
-  /** DingTalk mobile (cached for display) */
-  @Column({ name: 'ding_mobile', length: 20, nullable: true })
-  dingMobile: string;
-
-  @CreateDateColumn({ name: 'created_at' })
-  createdAt: Date;
-
-  @UpdateDateColumn({ name: 'updated_at' })
-  updatedAt: Date;
-}