Fixing the error when importing a large Excel file

apps/api/src/project-boards/project-boards.controller.ts

@@ -148,10 +148,17 @@ export class ProjectBoardsController {
   )
   importCards(
     @CurrentUser() user: Actor,
-    @UploadedFile() file: Express.Multer.File,
+    @UploadedFile() file: Express.Multer.File | undefined,
     @Body('mapping') mapping?: string,
+    @Body('sessionId') sessionId?: string,
+    @Body('offset') offset?: string,
+    @Body('limit') limit?: string,
   ) {
-    return this.excelService.import(user, file, mapping);
+    return this.excelService.import(user, file, mapping, {
+      sessionId,
+      offset,
+      limit,
+    });
   }
 
   @Get('project-cards/:id')

apps/api/src/project-boards/project-cards-excel.service.ts

@@ -15,6 +15,10 @@ import {
   writeXlsx,
   type ExcelPreviewResult,
 } from '../common/excel';
+import {
+  chunkImportMeta,
+  resolveExcelImportChunk,
+} from '../common/excel-import-session';
 import { ProjectBoardsService } from './project-boards.service';
 
 const CASE_COLUMNS = [
@@ -115,16 +119,25 @@ export class ProjectCardsExcelService {
 
   async import(
     actor: Actor,
-    file: Express.Multer.File,
+    file: Express.Multer.File | undefined,
     mappingRaw?: string,
+    chunk?: { sessionId?: string; offset?: string | number; limit?: string | number },
   ): Promise<ImportContactsResult> {
-    const rows = await readMappedRows(file, CASE_ALIASES, parseExcelMapping(mappingRaw));
+    const ctx = await resolveExcelImportChunk({
+      organizationId: actor.organizationId,
+      file,
+      sessionId: chunk?.sessionId,
+      offset: chunk?.offset,
+      limit: chunk?.limit,
+      loadRows: () =>
+        readMappedRows(file!, CASE_ALIASES, parseExcelMapping(mappingRaw)),
+    });
     const result: ImportContactsResult = { created: 0, skipped: 0, errors: [] };
     const affected = new Map<string, string>();
 
-    for (let i = 0; i < rows.length; i++) {
-      const row = rows[i]!;
-      const rowNum = i + 2;
+    for (let i = 0; i < ctx.slice.length; i++) {
+      const row = ctx.slice[i]!;
+      const rowNum = ctx.offset + i + 2;
       if ((row._type || '').trim() && row._type.trim().toLowerCase() !== 'case') {
         continue;
       }
@@ -185,7 +198,7 @@ export class ProjectCardsExcelService {
       result.boards = entries.map(([, n]) => n);
     }
 
-    return result;
+    return { ...result, ...chunkImportMeta(ctx) };
   }
 
   private async resolveBoardAndStage(