feat: add attendance device SN classroom bindings

apps/server/src/entities/attendance-device.entity.ts

@@ -0,0 +1,52 @@
+import {
+  Column,
+  CreateDateColumn,
+  Entity,
+  Index,
+  JoinColumn,
+  ManyToOne,
+  PrimaryGeneratedColumn,
+  UpdateDateColumn,
+} from 'typeorm';
+import { Classroom } from './classroom.entity';
+
+export enum AttendanceDeviceStatus {
+  ACTIVE = 'active',
+  DISABLED = 'disabled',
+}
+
+@Entity('attendance_devices')
+@Index(['deviceSn'], { unique: true })
+@Index(['classroomId'])
+export class AttendanceDevice {
+  @PrimaryGeneratedColumn()
+  id: number;
+
+  @Column({ name: 'device_sn', type: 'varchar', length: 100 })
+  deviceSn: string;
+
+  @Column({ name: 'device_name', type: 'varchar', length: 100 })
+  deviceName: string;
+
+  @Column({ name: 'classroom_id', type: 'integer' })
+  classroomId: number;
+
+  @ManyToOne(() => Classroom, { onDelete: 'CASCADE' })
+  @JoinColumn({ name: 'classroom_id' })
+  classroom: Classroom;
+
+  @Column({ type: 'varchar', length: 20, default: AttendanceDeviceStatus.ACTIVE })
+  status: AttendanceDeviceStatus | 'active' | 'disabled';
+
+  @Column({ type: 'varchar', length: 200, nullable: true })
+  location: string | null;
+
+  @Column({ type: 'text', nullable: true })
+  notes: string | null;
+
+  @CreateDateColumn({ name: 'created_at' })
+  createdAt: Date;
+
+  @UpdateDateColumn({ name: 'updated_at' })
+  updatedAt: Date;
+}

apps/server/src/entities/index.ts

@@ -22,6 +22,7 @@ export { ClassTeacher, TeacherRoleType } from './class-teacher.entity';
 export { ClassSchedule, ScheduleType } from './class-schedule.entity';
 export { AttendanceRecord } from './attendance-record.entity';
 export { AttendanceSession } from './attendance-session.entity';
+export { AttendanceDevice, AttendanceDeviceStatus } from './attendance-device.entity';
 export { DingAttendanceRaw } from './ding-attendance-raw.entity';
 export { SyncLog } from './sync-log.entity';
 export { SyncState } from './sync-state.entity';