diff --git a/apps/api/package.json b/apps/api/package.json
index 83645f9..f851c23 100644
--- a/apps/api/package.json
+++ b/apps/api/package.json
@@ -12,7 +12,7 @@
     "prisma:seed": "tsx prisma/seed.ts",
     "lint": "echo \"api lint placeholder\"",
     "typecheck": "tsc --noEmit -p tsconfig.json && tsc --noEmit -p test/tsconfig.json",
-    "test": "tsx --test test/tahesab-methods.test.ts test/dates.test.ts test/birthdays.test.ts test/message-automation.test.ts test/record-scope.test.ts test/gamification-engine.test.ts test/automation-branches.test.ts test/pipeline-merge.test.ts test/ask-count.test.ts test/prior-archive.test.ts"
+    "test": "tsx --test test/tahesab-methods.test.ts test/dates.test.ts test/birthdays.test.ts test/message-automation.test.ts test/record-scope.test.ts test/gamification-engine.test.ts test/automation-branches.test.ts test/pipeline-merge.test.ts test/ask-count.test.ts test/prior-archive.test.ts test/organizations.test.ts"
   },
   "dependencies": {
     "@mento/shared": "*",
diff --git a/apps/api/src/organizations/dto.ts b/apps/api/src/organizations/dto.ts
index 5fd09d9..ff15960 100644
--- a/apps/api/src/organizations/dto.ts
+++ b/apps/api/src/organizations/dto.ts
@@ -12,6 +12,7 @@ import {
 } from 'class-validator';
 import { Type } from 'class-transformer';
 import { BUSINESS_FIELDS } from '@mento/shared';
+import type { UpdatePriorArchiveCutoffRequest } from '@mento/shared';
 
 export class ExchangeRateInputDto {
   @IsString()
@@ -67,3 +68,9 @@ export class UpdateOrganizationDto {
   @IsIn([...BUSINESS_FIELDS])
   businessField?: (typeof BUSINESS_FIELDS)[number];
 }
+
+export class UpdatePriorArchiveCutoffDto
+  implements UpdatePriorArchiveCutoffRequest
+{
+  cutoffAt!: string | null;
+}
diff --git a/apps/api/src/organizations/organizations.controller.ts b/apps/api/src/organizations/organizations.controller.ts
index 10e8331..e9e2ec0 100644
--- a/apps/api/src/organizations/organizations.controller.ts
+++ b/apps/api/src/organizations/organizations.controller.ts
@@ -1,4 +1,12 @@
-import { Body, Controller, Get, Patch, Post, UseGuards } from '@nestjs/common';
+import {
+  BadRequestException,
+  Body,
+  Controller,
+  Get,
+  Patch,
+  Post,
+  UseGuards,
+} from '@nestjs/common';
 import { JwtAuthGuard } from '../auth/jwt-auth.guard';
 import { RolesGuard } from '../auth/roles.guard';
 import { Roles } from '../auth/roles.decorator';
@@ -6,6 +14,7 @@ import { CurrentUser } from '../auth/current-user.decorator';
 import { AuthService } from '../auth/auth.service';
 import {
   CreateOrganizationDto,
+  UpdatePriorArchiveCutoffDto,
   UpdateOrgCurrenciesDto,
   UpdateOrganizationDto,
 } from './dto';
@@ -58,4 +67,19 @@ export class OrganizationsController {
       dto,
     );
   }
+
+  @Patch('current/prior-archive-cutoff')
+  @Roles('owner')
+  updatePriorArchiveCutoff(
+    @CurrentUser() user: { organizationId: string },
+    @Body() dto: UpdatePriorArchiveCutoffDto,
+  ) {
+    if (!Object.prototype.hasOwnProperty.call(dto ?? {}, 'cutoffAt')) {
+      throw new BadRequestException('تاریخ قطع باید مشخص شود.');
+    }
+    return this.organizationsService.updatePriorArchiveCutoff(
+      user.organizationId,
+      dto.cutoffAt,
+    );
+  }
 }
diff --git a/apps/api/src/organizations/organizations.service.ts b/apps/api/src/organizations/organizations.service.ts
index 9b7a363..9393282 100644
--- a/apps/api/src/organizations/organizations.service.ts
+++ b/apps/api/src/organizations/organizations.service.ts
@@ -7,6 +7,7 @@ import {
 import type {
   OrganizationDto,
   UpdateOrgCurrenciesRequest,
+  UpdatePriorArchiveCutoffRequest,
 } from '@mento/shared';
 import { CURRENCY_CATALOG, isBusinessField } from '@mento/shared';
 import { Prisma } from '@prisma/client';
@@ -214,6 +215,39 @@ export class OrganizationsService {
     return this.getCurrent(organizationId);
   }
 
+  async updatePriorArchiveCutoff(
+    organizationId: string,
+    cutoffAt: UpdatePriorArchiveCutoffRequest['cutoffAt'],
+  ): Promise<OrganizationDto> {
+    const org = await this.prisma.organization.findUnique({
+      where: { id: organizationId },
+      select: { enabledModules: true },
+    });
+    if (!org) throw new NotFoundException('سازمان پیدا نشد');
+
+    const modules = this.billing.normalizeModules(org.enabledModules);
+    if (!modules.includes('prior_data_archive')) {
+      throw new BadRequestException(
+        'ماژول بایگانی اطلاعات قبل برای این محیط فعال نیست.',
+      );
+    }
+
+    let value: Date | null = null;
+    if (cutoffAt !== null && cutoffAt !== '') {
+      const parsed = new Date(cutoffAt);
+      if (Number.isNaN(parsed.getTime())) {
+        throw new BadRequestException('تاریخ قطع معتبر نیست.');
+      }
+      value = parsed;
+    }
+
+    await this.prisma.organization.update({
+      where: { id: organizationId },
+      data: { priorArchiveEnabledAt: value },
+    });
+    return this.getCurrent(organizationId);
+  }
+
   catalog() {
     return CURRENCY_CATALOG;
   }
@@ -226,6 +260,7 @@ export class OrganizationsService {
     baseCurrency: string;
     enabledCurrencies: string[];
     enabledModules?: string[];
+    priorArchiveEnabledAt?: Date | null;
     exchangeRates: Array<{
       currency: string;
       rateToBase: Prisma.Decimal;
@@ -243,6 +278,7 @@ export class OrganizationsService {
       baseCurrency: org.baseCurrency,
       enabledCurrencies: org.enabledCurrencies,
       enabledModules: this.billing.normalizeModules(org.enabledModules),
+      priorArchiveCutoffAt: org.priorArchiveEnabledAt?.toISOString() ?? null,
       exchangeRates: org.exchangeRates.map((r) => ({
         currency: r.currency,
         rateToBase: Number(r.rateToBase),
diff --git a/apps/api/test/organizations.test.ts b/apps/api/test/organizations.test.ts
new file mode 100644
index 0000000..8105bc0
--- /dev/null
+++ b/apps/api/test/organizations.test.ts
@@ -0,0 +1,130 @@
+import 'reflect-metadata';
+import { describe, it } from 'node:test';
+import assert from 'node:assert/strict';
+import { BadRequestException } from '@nestjs/common';
+import type { UpdatePriorArchiveCutoffRequest } from '@mento/shared';
+import { ROLES_KEY } from '../src/auth/roles.decorator';
+import { OrganizationsController } from '../src/organizations/organizations.controller';
+import { OrganizationsService } from '../src/organizations/organizations.service';
+
+const cutoff = new Date('2026-10-01T00:00:00.000Z');
+
+function makeOrg(overrides: Record<string, unknown> = {}) {
+  return {
+    id: 'org-1',
+    name: 'Org',
+    slug: 'org',
+    businessField: 'personal',
+    baseCurrency: 'IRR',
+    enabledCurrencies: ['IRR'],
+    enabledModules: ['prior_data_archive'],
+    priorArchiveEnabledAt: cutoff,
+    exchangeRates: [],
+    ...overrides,
+  };
+}
+
+function makeService(org = makeOrg()) {
+  const calls: Array<{ where: unknown; data: unknown }> = [];
+  const prisma = {
+    organization: {
+      findUnique: async () => org,
+      update: async (args: { where: unknown; data: unknown }) => {
+        calls.push(args);
+        return org;
+      },
+    },
+  };
+  const billing = {
+    normalizeModules: (modules?: string[]) => modules ?? [],
+  };
+  const service = new OrganizationsService(
+    prisma as never,
+    {} as never,
+    {} as never,
+    {} as never,
+    billing as never,
+  );
+  return { service, calls };
+}
+
+describe('OrganizationsService prior archive cutoff', () => {
+  it('returns the current cutoff in the organization dto', async () => {
+    const { service } = makeService();
+
+    const dto = await service.getCurrent('org-1');
+
+    assert.equal(dto.priorArchiveCutoffAt, cutoff.toISOString());
+  });
+
+  it('updates and clears the cutoff when prior archive is enabled', async () => {
+    const { service, calls } = makeService();
+
+    await service.updatePriorArchiveCutoff('org-1', '2026-11-02T00:00:00.000Z');
+    await service.updatePriorArchiveCutoff('org-1', null);
+
+    assert.deepEqual(calls.map((call) => call.data), [
+      { priorArchiveEnabledAt: new Date('2026-11-02T00:00:00.000Z') },
+      { priorArchiveEnabledAt: null },
+    ]);
+  });
+
+  it('rejects invalid cutoffs and disabled modules', async () => {
+    const enabled = makeService();
+    await assert.rejects(
+      () => enabled.service.updatePriorArchiveCutoff('org-1', 'not-a-date'),
+      BadRequestException,
+    );
+
+    const disabled = makeService(makeOrg({ enabledModules: [] }));
+    await assert.rejects(
+      () =>
+        disabled.service.updatePriorArchiveCutoff(
+          'org-1',
+          '2026-11-02T00:00:00.000Z',
+        ),
+      BadRequestException,
+    );
+  });
+});
+
+describe('OrganizationsController prior archive cutoff', () => {
+  it('exposes an owner-only explicit cutoff patch', async () => {
+    const calls: Array<UpdatePriorArchiveCutoffRequest['cutoffAt']> = [];
+    const controller = new OrganizationsController(
+      {
+        updatePriorArchiveCutoff: async (
+          _organizationId: string,
+          cutoffAt: UpdatePriorArchiveCutoffRequest['cutoffAt'],
+        ) => {
+          calls.push(cutoffAt);
+          return makeOrg();
+        },
+      } as never,
+      {} as never,
+    );
+
+    assert.deepEqual(
+      Reflect.getMetadata(
+        ROLES_KEY,
+        controller.updatePriorArchiveCutoff,
+      ),
+      ['owner'],
+    );
+    assert.throws(
+      () =>
+        controller.updatePriorArchiveCutoff(
+          { organizationId: 'org-1' },
+          {} as UpdatePriorArchiveCutoffRequest,
+        ),
+      BadRequestException,
+    );
+
+    await controller.updatePriorArchiveCutoff(
+      { organizationId: 'org-1' },
+      { cutoffAt: null },
+    );
+
+    assert.deepEqual(calls, [null]);
+  });
+});