Make role depend on String not int

[1-alex98]

Caused by: org.postgresql.util.PSQLException: Bad value for type int : FOUNDER
        at org.postgresql.jdbc.PgResultSet.toInt(PgResultSet.java:2844) ~[postgresql-42.2.5.jar!/:42.2.5]
        at org.postgresql.jdbc.PgResultSet.getInt(PgResultSet.java:2073) ~[postgresql-42.2.5.jar!/:42.2.5]
        at org.postgresql.jdbc.PgResultSet.getInt(PgResultSet.java:2485) ~[postgresql-42.2.5.jar!/:42.2.5]
        at com.zaxxer.hikari.pool.HikariProxyResultSet.getInt(HikariProxyResultSet.java) ~[HikariCP-2.6.1.jar!/:na]
        at org.hibernate.metamodel.model.convert.internal.OrdinalEnumValueConverter.readValue(OrdinalEnumValueConverter.java:58) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        at org.hibernate.type.EnumType.nullSafeGet(EnumType.java:250) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        at org.hibernate.type.CustomType.nullSafeGet(CustomType.java:119) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        at org.hibernate.type.AbstractType.hydrate(AbstractType.java:91) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:3010) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        at org.hibernate.loader.plan.exec.process.internal.EntityReferenceInitializerImpl.loadFromResultSet(EntityReferenceInitializerImpl.java:305) ~[hibernate-core-5.3.9.Final.jar!/:5.3.9.Final]
        ... 132 common frames omitted