message: Remove FK constraint on Feedback
  (to allow anonymous feedback posts)
diff: @@ -13,7 +13,7 @@ module.exports = function (sequelize, DataTypes) {
  {
  classMethods: {
  associate: function (models) {
  - Feedback.belongsTo(models.User, { constraints: true, foreignKeyConstraint: true })
  + Feedback.belongsTo(models.User) // no FK constraint to allow anonymous feedback posts
  }
  },
  