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  1. or download this
    __PACKAGE__->ensure_class_loaded('DBIx::Class::Storage::DBI::MariaDB');
  2. or download this
    __PACKAGE__->add_unique_constraint(
  "PRIMARY", ["id"]
);
  3. or download this
    Error:  {UNKNOWN}: DBIx::Class::ResultSource::_pri_cols_or_die(): Oper
+ation requires a primary key to be declared on 'MyApp::Schema::XYZ' v
+ia set_primary_key ...
  4. or download this
    # when I am using DBI:mysql ...
__PACKAGE__->add_columns(
...
   }
);
__PACKAGE__->set_primary_key("id");