test: harden business boundary conditions

apps/server/src/sync/dto/schedule-sync.dto.ts

@@ -0,0 +1,21 @@
+import { Transform, Type } from 'class-transformer';
+import { IsBoolean, IsISO8601, IsInt, IsOptional, Matches, Max, Min } from 'class-validator';
+
+export class ScheduleSyncQueryDto {
+  @IsOptional()
+  @Matches(/^\d{4}-\d{2}-\d{2}$/)
+  @IsISO8601({ strict: true })
+  dateFrom?: string;
+
+  @IsOptional()
+  @Type(() => Number)
+  @IsInt()
+  @Min(1)
+  @Max(90)
+  days: number = 30;
+
+  @IsOptional()
+  @Transform(({ value }) => value === true || value === 'true')
+  @IsBoolean()
+  attendanceMachineOnly: boolean = false;
+}