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backend/src/common/dto/paging/chat-paging-query.dto.ts

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+import { ApiPropertyOptional } from '@nestjs/swagger';
+import { IsNumber, IsOptional } from 'class-validator';
+
+import { PagingDefault } from '../../constants';
+
+export class ChatPagingQuery {
+  @ApiPropertyOptional({ description: 'Offset', example: 0 })
+  @IsOptional()
+  @IsNumber()
+  offset?: number;
+
+  @ApiPropertyOptional({ description: 'Limit', example: 10 })
+  @IsOptional()
+  @IsNumber()
+  limit?: number;
+
+  @ApiPropertyOptional({ description: 'Cursor position for pagination' })
+  @IsOptional()
+  @IsNumber()
+  cursor?: number;
+
+  constructor(offset: number | undefined, limit: number | undefined, cursor: number | undefined) {
+    this.offset = offset;
+    this.limit = limit;
+    this.cursor = cursor;
+  }
+
+  static default(): ChatPagingQuery {
+    return new ChatPagingQuery(undefined, undefined, undefined);
+  }
+
+  get skip(): number {
+    return this.offset ?? PagingDefault.offset;
+  }
+
+  get take(): number {
+    return this.limit ?? PagingDefault.limit;
+  }
+}