Improved migrations.

db/migrate/20160810000003_update_activity_stream.rb

@@ -7,6 +7,9 @@ class UpdateActivityStream < ActiveRecord::Migration
     add_column :activity_streams, :permission_id, :integer, null: true
     remove_column :activity_streams, :role_id
 
+    ActivityStream.connection.schema_cache.clear!
+    ActivityStream.reset_column_information
+
     Setting.create_or_update(
       title: 'sipgate.io integration',
       name: 'sipgate_integration',

db/migrate/20160811000001_update_role.rb

@@ -7,6 +7,9 @@ class UpdateRole < ActiveRecord::Migration
     add_column :roles, :preferences, :text, limit: 500.kilobytes + 1, null: true
     add_column :roles, :default_at_signup, :boolean, null: true, default: false
 
+    Role.connection.schema_cache.clear!
+    Role.reset_column_information
+
     Role.create_or_update(
       id: 1,
       name: 'Admin',

db/migrate/20160815000001_update_setting_auth.rb

@@ -7,6 +7,9 @@ class UpdateSettingAuth < ActiveRecord::Migration
     change_column :settings, :preferences, :text, limit: 200.kilobytes + 1, null: true
     change_column :settings, :state_current, :text, limit: 200.kilobytes + 1, null: true
 
+    Setting.connection.schema_cache.clear!
+    Setting.reset_column_information
+
     Setting.create_if_not_exists(
       title: 'Authentication via %s',
       name: 'auth_ldap',