Username validation before submit

[RihanArfan]

https://vee-validate.logaretm.com/v4/guide/composition-api/handling-forms/#setting-errors-manually

[RihanArfan]

Mutation duplicate

{
  "errors": [
    {
      "message": "Uniqueness violation. duplicate key value violates unique constraint \"profiles_pkey\"",
      "extensions": {
        "path": "$.selectionSet.insert_profiles_one.args.object",
        "code": "constraint-violation"
      }
    }
  ]
}