diff --git a/.env.example b/.env.example
index 2d4e67e..f559c39 100644
--- a/.env.example
+++ b/.env.example
@@ -2,8 +2,10 @@
 PORT=3023
 
 #database
-DB_HOST="localhost"
-DB_PORT=3306
-DB_USERNAME="root"
-DB_PASSWORD=""
-DB_NAME="notification_db"
\ No newline at end of file
+POSTGRES_HOST="localhost"
+POSTGRES_PORT=5432
+POSTGRES_USER="postgres"
+POSTGRES_PASSWORD=""
+POSTGRES_DATABASE="notification_db"
+POSTGRES_SSL=false
+POSTGRES_SYNC=true
\ No newline at end of file
diff --git a/ecosystem.config.js.example b/ecosystem.config.js.example
index 4b698ca..87c9711 100644
--- a/ecosystem.config.js.example
+++ b/ecosystem.config.js.example
@@ -3,8 +3,7 @@ module.exports = {
     name: "notification_server",
     script: "./dist/main.js", // cluster mode run with node only, not npm
     args: "",
-    exec_mode: "cluster", // default fork
-    instances: "max",
+    exec_mode: "fork", // default fork
     kill_timeout: 4000,
     wait_ready: true,
     autorestart: true,
diff --git a/src/notifications/notification.dto.ts b/src/notifications/notification.dto.ts
index 5545ad1..4b9d6d8 100644
--- a/src/notifications/notification.dto.ts
+++ b/src/notifications/notification.dto.ts
@@ -1,4 +1,4 @@
-import { IsInt, IsNotEmpty, IsString } from "class-validator";
+import { IsInt, IsNotEmpty, IsString } from 'class-validator';
 
 export class NotificationDto {
   @IsNotEmpty()
@@ -12,4 +12,4 @@ export class NotificationDto {
   @IsNotEmpty()
   @IsString()
   phone_number: string;
-}
\ No newline at end of file
+}
diff --git a/src/notifications/notification.module.ts b/src/notifications/notification.module.ts
index bf548e3..e17e45c 100644
--- a/src/notifications/notification.module.ts
+++ b/src/notifications/notification.module.ts
@@ -1,12 +1,11 @@
-import { Module } from "@nestjs/common";
-import { NotificationController } from "./notification.controller";
-import { NotificationService } from "./notification.service";
-import { SocketModule } from "../socket/socket.module";
+import { Module } from '@nestjs/common';
+import { NotificationController } from './notification.controller';
+import { NotificationService } from './notification.service';
+import { SocketModule } from '../socket/socket.module';
 
 @Module({
   imports: [SocketModule],
   controllers: [NotificationController],
   providers: [NotificationService],
 })
-export class NotificationModule {
-}
\ No newline at end of file
+export class NotificationModule {}