diff --git a/src/AppConfig/appconfig.schema.ts b/src/AppConfig/appconfig.schema.ts
index 982e673..6d36ea4 100644
--- a/src/AppConfig/appconfig.schema.ts
+++ b/src/AppConfig/appconfig.schema.ts
@@ -64,7 +64,7 @@ export class AppConfigSchema extends PothosSchema {
         type: this.appConfig(),
         description: 'Get an app config by key',
         args: this.builder.generator.findUniqueArgs('Config'),
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           return await this.prisma.config.findUnique({
             ...query,
             where: args.where ?? undefined,
@@ -84,7 +84,7 @@ export class AppConfigSchema extends PothosSchema {
             required: true,
           }),
         },
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           return await this.prisma.config.create({
             ...query,
             data: args.input,
@@ -100,7 +100,7 @@ export class AppConfigSchema extends PothosSchema {
             required: true,
           }),
         },
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           return await this.prisma.config.createManyAndReturn({
             ...query,
             data: args.input,
diff --git a/src/AppConfig/appconfig.service.ts b/src/AppConfig/appconfig.service.ts
index 2d36c9d..be95237 100644
--- a/src/AppConfig/appconfig.service.ts
+++ b/src/AppConfig/appconfig.service.ts
@@ -13,14 +13,16 @@ export class AppConfigService implements OnModuleInit {
     const configs = await this.prisma.config.findMany()
     if (configs.length === 0) {
       Object.entries(ConfigConstants).forEach(async ([_key, value]) => {
-        await this.prisma.config.create({
-          data: {
-            name: value.name,
-            key: value.key,
-            value: value.value,
-            visible: value.visible,
-          },
-        })
+        try {
+          await this.prisma.config.create({
+            data: {
+              name: value.name,
+              key: value.key,
+              value: value.value,
+              visible: value.visible,
+            },
+          })
+        } catch (_error) {}
       })
     }
   }
@@ -50,9 +52,20 @@ export class AppConfigService implements OnModuleInit {
     })
   }
 
-  async deleteConfig(key: string) {
-    return await this.prisma.config.delete({
+  async resetConfig(key: string) {
+    // reset config to default value
+    await this.prisma.config.update({
       where: { key },
+      data: ConfigConstants[key],
+    })
+  }
+
+  async resetAllConfigs() {
+    // reset all configs to default values
+    Object.entries(ConfigConstants).forEach(async ([_key, value]) => {
+      await this.prisma.config.create({
+        data: value,
+      })
     })
   }
 }
diff --git a/src/Center/center.schema.ts b/src/Center/center.schema.ts
index a54cfef..1dd0844 100644
--- a/src/Center/center.schema.ts
+++ b/src/Center/center.schema.ts
@@ -282,7 +282,7 @@ export class CenterSchema extends PothosSchema {
                   'CenterRejected',
                   {
                     CENTER_NAME: center.name,
-                    ADMIN_NOTE: args.adminNote,
+                    ADMIN_NOTE: args.adminNote ?? '',
                   },
                 )
               } catch (error) {
diff --git a/src/CenterMentor/centermentor.schema.ts b/src/CenterMentor/centermentor.schema.ts
index 748e300..83680c1 100644
--- a/src/CenterMentor/centermentor.schema.ts
+++ b/src/CenterMentor/centermentor.schema.ts
@@ -163,7 +163,7 @@ export class CenterMentorSchema extends PothosSchema {
             // mail to user with params centerId, email
             await this.mailService.sendTemplateEmail(
               [args.email],
-              'Invite to center',
+              `Thư mời làm việc tại trung tâm ${center.name}`,
               'MentorInvitation',
               {
                 center_name: center.name,
@@ -220,10 +220,6 @@ export class CenterMentorSchema extends PothosSchema {
             throw new Error('Not allowed')
           }
           return this.prisma.$transaction(async (prisma) => {
-            // validate input
-            if (args.approved && !args.adminNote) {
-              throw new Error('Admin note is required')
-            }
             // get mentor info
             const mentor = await prisma.user.findUnique({
               where: args.where,
diff --git a/src/User/user.schema.ts b/src/User/user.schema.ts
index a468b0a..5f4835f 100644
--- a/src/User/user.schema.ts
+++ b/src/User/user.schema.ts
@@ -135,7 +135,7 @@ export class UserSchema extends PothosSchema {
       me: t.prismaField({
         description: 'Retrieve the current user in context.',
         type: this.user(),
-        resolve: async (query, root, args, ctx) => {
+        resolve: async (_query, _root, _args, ctx) => {
           if (ctx.isSubscription) {
             throw new Error('Not allowed')
           }
@@ -148,7 +148,7 @@ export class UserSchema extends PothosSchema {
           'Retrieve a list of users with optional filtering, ordering, and pagination.',
         type: [this.user()],
         args: this.builder.generator.findManyArgs('User'),
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           return await this.prisma.user.findMany({
             ...query,
             take: args.take ?? undefined,
@@ -163,7 +163,7 @@ export class UserSchema extends PothosSchema {
         description: 'Retrieve a single user by their unique identifier.',
         type: this.user(),
         args: this.builder.generator.findUniqueArgs('User'),
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           return await this.prisma.user.findUniqueOrThrow({
             ...query,
             where: args.where,
@@ -176,7 +176,7 @@ export class UserSchema extends PothosSchema {
         args: {
           sessionId: t.arg({ type: 'String', required: true }),
         },
-        resolve: async (query, root, args) => {
+        resolve: async (query, _root, args) => {
           // check if the token is valid
           const session = await clerkClient.sessions.getSession(args.sessionId)
           Logger.log(session, 'Session')