diff --git a/prisma/migrations/20260910120000_plugin_subscription_catalog_key/migration.sql b/prisma/migrations/20260910120000_plugin_subscription_catalog_key/migration.sql
new file mode 100644
index 0000000..70c34cb
--- /dev/null
+++ b/prisma/migrations/20260910120000_plugin_subscription_catalog_key/migration.sql
@@ -0,0 +1,13 @@
+-- Catalog linkage on plugin_subscriptions was in schema.prisma without a
+-- CREATE COLUMN migration. Remote store GET swallows the missing column;
+-- POST create did not, so purchase requests returned HTTP 500.
+
+ALTER TABLE "plugin_subscriptions"
+  ADD COLUMN IF NOT EXISTS "setting_key" VARCHAR(50);
+ALTER TABLE "plugin_subscriptions"
+  ADD COLUMN IF NOT EXISTS "auto_cut_on_expiry" BOOLEAN NOT NULL DEFAULT false;
+ALTER TABLE "plugin_subscriptions"
+  ADD COLUMN IF NOT EXISTS "alert_marks" JSONB;
+
+CREATE INDEX IF NOT EXISTS "plugin_subscriptions_setting_key_idx"
+  ON "plugin_subscriptions"("setting_key");
diff --git a/src/plugins/plugin-store.service.ts b/src/plugins/plugin-store.service.ts
index d0e5f5b..332ba3a 100644
--- a/src/plugins/plugin-store.service.ts
+++ b/src/plugins/plugin-store.service.ts
@@ -3,6 +3,7 @@ import {
   ConflictException,
   ForbiddenException,
   Injectable,
+  InternalServerErrorException,
   Logger,
   NotFoundException,
   OnModuleDestroy,
@@ -722,10 +723,16 @@ export class PluginStoreService implements OnModuleInit, OnModuleDestroy {
       throw new ConflictException('درخواست در انتظار برای این افزونه وجود دارد');
     }
 
-    const sub = await this.prisma.pluginSubscription.findFirst({
-      where: { tenantId, settingKey: item.settingKey, isActive: true },
-      orderBy: { expiresAt: 'desc' },
-    });
+    let sub: { isActive: boolean; expiresAt: Date | null } | null = null;
+    try {
+      sub = await this.prisma.pluginSubscription.findFirst({
+        where: { tenantId, settingKey: item.settingKey, isActive: true },
+        orderBy: { expiresAt: 'desc' },
+        select: { isActive: true, expiresAt: true },
+      });
+    } catch (error: any) {
+      this.logger.warn(`remoteCreateRequest sub skipped: ${error?.message || error}`);
+    }
     if (sub?.isActive && !sub.expiresAt) {
       throw new ConflictException('این افزونه یکبار پرداخت شده و فعال است');
     }
@@ -736,35 +743,50 @@ export class PluginStoreService implements OnModuleInit, OnModuleDestroy {
       }
     }
 
-    const created = await this.prisma.pluginPurchaseRequest.create({
-      data: {
-        tenantId,
-        catalogItemId: item.id,
-        durationDays: dto.durationDays,
-        originalPriceRials: price.originalPriceRials,
-        finalPriceRials: price.finalPriceRials,
-        status: 'pending',
-      },
-      include: {
-        catalogItem: { select: { titleFa: true, settingKey: true } },
-        tenant: { select: { nameFa: true, domain: true } },
-      },
-    });
+    try {
+      const created = await this.prisma.pluginPurchaseRequest.create({
+        data: {
+          tenantId,
+          catalogItemId: item.id,
+          durationDays: dto.durationDays,
+          originalPriceRials: price.originalPriceRials,
+          finalPriceRials: price.finalPriceRials,
+          status: 'pending',
+        },
+        include: {
+          catalogItem: { select: { titleFa: true, settingKey: true } },
+          tenant: { select: { nameFa: true, domain: true } },
+        },
+      });
 
-    this.notify.notifyAdmins(
-      `درخواست افزونه: «${created.catalogItem.titleFa}» ${pluginStoreDurationLabel(dto.durationDays)} برای «${created.tenant.nameFa}» (${created.tenant.domain}) — ${price.finalPriceRials.toLocaleString('fa-IR')} ریال`,
-    );
+      this.notify.notifyAdmins(
+        `درخواست افزونه: «${created.catalogItem.titleFa}» ${pluginStoreDurationLabel(dto.durationDays)} برای «${created.tenant.nameFa}» (${created.tenant.domain}) — ${price.finalPriceRials.toLocaleString('fa-IR')} ریال`,
+      );
 
-    return this.toRequestRow({
-      ...created,
-      tenant: {
-        id: tenantId,
-        nameFa: created.tenant.nameFa,
-        domain: created.tenant.domain,
-        slug: '',
-        product: ProductType.khanegi,
-      },
-    } as any);
+      return this.toRequestRow({
+        ...created,
+        tenant: {
+          id: tenantId,
+          nameFa: created.tenant.nameFa,
+          domain: created.tenant.domain,
+          slug: '',
+          product: ProductType.khanegi,
+        },
+      } as any);
+    } catch (error: any) {
+      if (
+        error instanceof BadRequestException ||
+        error instanceof ConflictException ||
+        error instanceof ForbiddenException ||
+        error instanceof NotFoundException
+      ) {
+        throw error;
+      }
+      this.logger.error(`remoteCreateRequest failed: ${error?.message || error}`);
+      throw new InternalServerErrorException(
+        error?.message || 'ثبت درخواست افزونه ناموفق بود',
+      );
+    }
   }
 
   async remoteCancelRequest(tenantId: string, product: string, requestId: string) {