fix: Change data type of history attribute in user table to long text

When using mysql the normal text attribute has a fixed size. When this size is reached then the json will be cut off and becomes invalid.

Signed-off-by: Tilman Vatteroth <git@tilmanvatteroth.de>

lib/migrations/20220901102800-convert-history-to-longtext.js

@@ -5,5 +5,11 @@ module.exports = {
     return queryInterface.changeColumn('Users', 'history', {
       type: Sequelize.TEXT('long')
     })
+  },
+
+  down: function (queryInterface, Sequelize) {
+    return queryInterface.changeColumn('Users', 'history', {
+      type: Sequelize.TEXT
+    })
   }
 }