diff --git a/src/application/migrations/006_add_calendar_view_setting.php b/src/application/migrations/006_add_calendar_view_setting.php
index 5dd85847..437b2c43 100644
--- a/src/application/migrations/006_add_calendar_view_setting.php
+++ b/src/application/migrations/006_add_calendar_view_setting.php
@@ -16,17 +16,21 @@ class Migration_Add_calendar_view_setting extends CI_Migration {
     {
         $this->load->dbforge();
 
-        $fields = [
-            'calendar_view' => [
-                'type' => 'VARCHAR',
-                'constraint' => '32',
-                'default' => 'default'
-            ]
-        ];
+        $fields = $this->db->list_fields('ea_user_settings'); 
 
-        $this->dbforge->add_column('ea_user_settings', $fields);
-
-        $this->db->update('ea_user_settings', ['calendar_view' => 'default']);
+        if (!in_array('calendar_view', $fields, true)) {
+            $fields = [
+                'calendar_view' => [
+                    'type' => 'VARCHAR',
+                    'constraint' => '32',
+                    'default' => 'default'
+                ]
+            ];
+    
+            $this->dbforge->add_column('ea_user_settings', $fields);
+    
+            $this->db->update('ea_user_settings', ['calendar_view' => 'default']);
+        }
     }
 
     public function down()
diff --git a/src/application/migrations/007_add_service_availabilities_type.php b/src/application/migrations/007_add_service_availabilities_type.php
index 58c8fcbf..c9cf2659 100644
--- a/src/application/migrations/007_add_service_availabilities_type.php
+++ b/src/application/migrations/007_add_service_availabilities_type.php
@@ -14,25 +14,26 @@
 class Migration_Add_service_availabilities_type extends CI_Migration {
     public function up()
     {
-        $this->load->dbforge();
-
-        $fields = [
-            'availabilities_type' => [
-                'type' => 'VARCHAR',
-                'constraint' => '32',
-                'default' => 'flexible',
-                'after' => 'description'
-            ]
-        ];
-
-        $this->dbforge->add_column('ea_services', $fields);
-
-        $this->db->update('ea_services', ['availabilities_type' => 'flexible']);
+        if (!$this->db->field_exists('availabilities_type', 'ea_services')) {
+            $fields = [
+                'availabilities_type' => [
+                    'type' => 'VARCHAR',
+                    'constraint' => '32',
+                    'default' => 'flexible',
+                    'after' => 'description'
+                ]
+            ];
+    
+            $this->dbforge->add_column('ea_services', $fields);
+    
+            $this->db->update('ea_services', ['availabilities_type' => 'flexible']);
+        }
     }
 
     public function down()
     {
-        $this->load->dbforge();
-        $this->dbforge->drop_column('ea_services', 'availabilities_type');
+        if ($this->db->field_exists('availabilities_type', 'ea_services')) {
+            $this->dbforge->drop_column('ea_services', 'availabilities_type');
+        }
     }
 }
diff --git a/src/application/migrations/008_add_service_attendants_number.php b/src/application/migrations/008_add_service_attendants_number.php
index 1699c724..555a74b9 100644
--- a/src/application/migrations/008_add_service_attendants_number.php
+++ b/src/application/migrations/008_add_service_attendants_number.php
@@ -14,25 +14,26 @@
 class Migration_Add_service_attendants_number extends CI_Migration {
     public function up()
     {
-        $this->load->dbforge();
-
-        $fields = [
-            'attendants_number' => [
-                'type' => 'INT',
-                'constraint' => '11',
-                'default' => '1',
-                'after' => 'availabilities_type'
-            ]
-        ];
-
-        $this->dbforge->add_column('ea_services', $fields);
-
-        $this->db->update('ea_services', ['attendants_number' => '1']);
+        if (!$this->db->field_exists('attendants_number', 'ea_services')) {
+            $fields = [
+                'attendants_number' => [
+                    'type' => 'INT',
+                    'constraint' => '11',
+                    'default' => '1',
+                    'after' => 'availabilities_type'
+                ]
+            ];
+    
+            $this->dbforge->add_column('ea_services', $fields);
+    
+            $this->db->update('ea_services', ['attendants_number' => '1']);
+        }
     }
 
     public function down()
     {
-        $this->load->dbforge();
-        $this->dbforge->drop_column('ea_services', 'attendants_number');
+        if (!$this->db->field_exists('attendants_number', 'ea_services')) {
+            $this->dbforge->drop_column('ea_services', 'attendants_number');
+        }
     }
 }
diff --git a/src/application/migrations/009_change_column_types.php b/src/application/migrations/009_change_column_types.php
index 7748247a..87c707ae 100644
--- a/src/application/migrations/009_change_column_types.php
+++ b/src/application/migrations/009_change_column_types.php
@@ -14,8 +14,6 @@
 class Migration_Change_column_types extends CI_Migration {
     public function up()
     {
-        $this->load->dbforge();
-
         // Appointments
         $fields = [
             'id' => [
@@ -189,8 +187,6 @@ class Migration_Change_column_types extends CI_Migration {
 
     public function down()
     {
-        $this->load->dbforge();
-
         // Appointments
         $fields = [
             'id' => [