diff --git a/src/Cron/cron.service.ts b/src/Cron/cron.service.ts
index 5068085..f833c57 100644
--- a/src/Cron/cron.service.ts
+++ b/src/Cron/cron.service.ts
@@ -165,7 +165,7 @@ export class CronService {
     Logger.log(`Found ${schedules.length} schedules to check`, 'taskCheckScheduleDateStart')
     for (const schedule of schedules) {
       await this.prisma.scheduleDate.updateMany({
-        where: { scheduleId: schedule.id, start: { lt: DateTimeUtils.now().plus({ minutes: 30 }).toJSDate() } },
+        where: { scheduleId: schedule.id },
         data: { status: ScheduleDateStatus.EXPIRED },
       })
       // update schedule status to expired
@@ -183,7 +183,7 @@ export class CronService {
           'Lịch hướng dẫn của bạn đã hết hạn',
           `Lịch hướng dẫn với ngày bắt đầu: ${DateTimeUtils.format(
             DateTimeUtils.fromDate(schedule.scheduleStart),
-            'DD/MM/YYYY',
+            'D',
           )}, slot: ${schedule.slots.map((s) => s).join(', ')} của bạn đã hết hạn do không có học viên đăng ký, vui lòng tạo lịch hướng dẫn mới`,
         )
       }
diff --git a/src/Document/document.schema.ts b/src/Document/document.schema.ts
index baf30d4..0117cd0 100644
--- a/src/Document/document.schema.ts
+++ b/src/Document/document.schema.ts
@@ -162,8 +162,12 @@ export class DocumentSchema extends PothosSchema {
           if (!ctx.http?.me?.id) throw new Error('User not found')
           if (!args.documentId) throw new Error('Document id not found')
           if (args.pageIndex === undefined || args.pageIndex === null) throw new Error('Page index not found')
-          const delta = await this.minio.getDocumentPage(args.documentId, args.pageIndex)
-          if (!delta) throw new Error('Delta not found')
+          let delta
+          try {
+            delta = await this.minio.getDocumentPage(args.documentId, args.pageIndex)
+          } catch (_error) {
+            delta = null
+          }
           const totalPage = await this.minio.countDocumentPages(args.documentId)
           return {
             documentId: args.documentId,
@@ -172,6 +176,7 @@ export class DocumentSchema extends PothosSchema {
             totalPage,
             senderId: ctx.http?.me?.id,
             eventType: DocumentEvent.CLIENT_REQUEST_SYNC,
+            requestSync: false,
           }
         },
       }),
diff --git a/src/Schedule/schedule.schema.ts b/src/Schedule/schedule.schema.ts
index 12df40d..bb3c243 100644
--- a/src/Schedule/schedule.schema.ts
+++ b/src/Schedule/schedule.schema.ts
@@ -220,10 +220,32 @@ export class ScheduleSchema extends PothosSchema {
         type: this.schedule(),
         description: 'Retrieve a single schedule by its unique identifier.',
         args: this.builder.generator.findUniqueArgs('Schedule'),
-        resolve: async (query, _root, args, _ctx, _info) => {
+        resolve: async (query, _root, args, ctx, _info) => {
+          if (ctx.isSubscription) {
+            throw new Error('Cannot retrieve schedule in subscription')
+          }
+          if (!ctx.http?.me?.id) {
+            throw new Error('User not found')
+          }
+          // only return schedule belong to center
+          const center = await this.prisma.center.findFirst({
+            where: {
+              centerMentors: {
+                some: {
+                  mentorId: ctx.http.me.id,
+                },
+              },
+            },
+          })
+          if (!center) {
+            throw new Error('Center not found')
+          }
           return await this.prisma.schedule.findUnique({
             ...query,
-            where: args.where,
+            where: {
+              id: args.where?.id,
+              managedService: { service: { centerId: center.id } },
+            },
           })
         },
       }),
@@ -300,6 +322,10 @@ d72a864e-2f41-45ab-9c9b-bf0512a31883,e9be51fd-2382-4e43-9988-74e76fde4b56,2024-1
             throw new Error('Cannot create schedule in subscription')
           }
           Logger.log('args.schedule', args.schedule)
+          // reject schedule if start date is today or in the past
+          if (DateTimeUtils.fromDate(args.schedule.scheduleStart as Date).day <= DateTimeUtils.now().day) {
+            throw new Error('Start date is in the past or today')
+          }
           // generate preview and check if there is any overlapping with other schedules date in same service
           const previewSchedule = await this.scheduleService.createSchedulePreviewForCenter({
             startDate: args.schedule.scheduleStart as string,