email sent when personal information changed

backend/services/email/core/EmailClient.js

@@ -11,8 +11,16 @@ const { htmlToPlainText } = require("./emailUtils");
  */
 class EmailClient {
   constructor() {
+    // Singleton pattern - return existing instance if already created
+    if (EmailClient.instance) {
+      return EmailClient.instance;
+    }
+
     this.sesClient = null;
     this.initialized = false;
+    this.initializationPromise = null;
+
+    EmailClient.instance = this;
   }
 
   /**
@@ -20,19 +28,30 @@ class EmailClient {
    * @returns {Promise<void>}
    */
   async initialize() {
+    // If already initialized, return immediately
     if (this.initialized) return;
 
-    try {
-      // Use centralized AWS configuration with credential profiles
-      const awsConfig = getAWSConfig();
-      this.sesClient = new SESClient(awsConfig);
-
-      this.initialized = true;
-      console.log("AWS SES Email Client initialized successfully");
-    } catch (error) {
-      console.error("Failed to initialize AWS SES Email Client:", error);
-      throw error;
+    // If initialization is in progress, wait for it
+    if (this.initializationPromise) {
+      return this.initializationPromise;
     }
+
+    // Start initialization and store the promise
+    this.initializationPromise = (async () => {
+      try {
+        // Use centralized AWS configuration with credential profiles
+        const awsConfig = getAWSConfig();
+        this.sesClient = new SESClient(awsConfig);
+
+        this.initialized = true;
+        console.log("AWS SES Email Client initialized successfully");
+      } catch (error) {
+        console.error("Failed to initialize AWS SES Email Client:", error);
+        throw error;
+      }
+    })();
+
+    return this.initializationPromise;
   }
 
   /**