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src/edge/edge.mapper.ts

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+import { EdgeResponseDto } from './dto/edge-response.dto';
+import { EdgeRow } from './edge.types';
+
+/** Преобразует строки БД edge в стабильный DTO для API. */
+export function createEdgeResponse(rows: EdgeRow[]): EdgeResponseDto {
+  return {
+    items: rows.map((row) => ({
+      id: row.id,
+      name: row.name,
+      parentId: row.parent_id,
+      tagIds: row.tag_ids ?? [],
+      tagCount: row.tag_count,
+      currentTagCount: row.current_tag_count,
+      liveTagCount: row.live_tag_count,
+      lastDataAt: row.last_data_at,
+    })),
+  };
+}