feat: enhance database management with new migration and database node functionalities, including CRUD operations and test cases

src/databaseManager/databaseNode/database.node.service.ts

@@ -61,6 +61,16 @@ export class DatabaseNodeService extends DatabaseEncryptionService {
     username: string,
     password: string
   ): Promise<DatabaseNode> {
+    const existingNode = await this.databaseNodeRepository.findOne({
+      where: { host, port },
+    });
+
+    if (existingNode) {
+      existingNode.password = this.encryptPassword(password);
+      existingNode.username = username;
+      return this.databaseNodeRepository.save(existingNode);
+    }
+
     const encryptedPassword = this.encryptPassword(password);
     const databaseNode = this.databaseNodeRepository.create({
       host,
@@ -68,6 +78,7 @@ export class DatabaseNodeService extends DatabaseEncryptionService {
       username,
       password: encryptedPassword,
     });
+
     return this.databaseNodeRepository.save(databaseNode);
   }
 
@@ -81,7 +92,7 @@ export class DatabaseNodeService extends DatabaseEncryptionService {
     return {
       host: node.host,
       port: node.port,
-      username: node.username,
+      user: node.username,
       password: this.decryptPassword(node.password),
     };
   }