feat(migration): enhance contact_message migration to check for existing columns before adding/removing

- Updated the migration script for the contact_message table to conditionally add or remove columns based on their existence, improving migration safety and preventing errors during deployment.
- This change ensures that the migration can be run multiple times without causing issues if the columns already exist or are missing.
[force-deploy]

backend/migrations/20240913071145-add-answer-fields-to-contact_message.cjs

@@ -2,42 +2,44 @@
 
 module.exports = {
   up: async (queryInterface, Sequelize) => {
-    await queryInterface.addColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'answer', {
-      type: Sequelize.TEXT,
-      allowNull: true
-    });
-    await queryInterface.addColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'answered_at', {
-      type: Sequelize.DATE,
-      allowNull: true
-    });
-    await queryInterface.addColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'is_answered', {
-      type: Sequelize.BOOLEAN,
-      allowNull: false,
-      defaultValue: false
-    });
+    const table = { tableName: 'contact_message', schema: 'service' };
+    const columns = await queryInterface.describeTable(table);
+
+    if (!columns.answer) {
+      await queryInterface.addColumn(table, 'answer', {
+        type: Sequelize.TEXT,
+        allowNull: true
+      });
+    }
+
+    if (!columns.answered_at) {
+      await queryInterface.addColumn(table, 'answered_at', {
+        type: Sequelize.DATE,
+        allowNull: true
+      });
+    }
+
+    if (!columns.is_answered) {
+      await queryInterface.addColumn(table, 'is_answered', {
+        type: Sequelize.BOOLEAN,
+        allowNull: false,
+        defaultValue: false
+      });
+    }
   },
 
   down: async (queryInterface, Sequelize) => {
-    await queryInterface.removeColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'answer');
-    await queryInterface.removeColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'answered_at');
-    await queryInterface.removeColumn({
-      tableName: 'contact_message',
-      schema: 'service'
-    }, 'is_answered');
+    const table = { tableName: 'contact_message', schema: 'service' };
+    const columns = await queryInterface.describeTable(table);
+
+    if (columns.answer) {
+      await queryInterface.removeColumn(table, 'answer');
+    }
+    if (columns.answered_at) {
+      await queryInterface.removeColumn(table, 'answered_at');
+    }
+    if (columns.is_answered) {
+      await queryInterface.removeColumn(table, 'is_answered');
+    }
   }
 };