text: -- ACL schema sql used in HSQLDB
  
  -- drop table acl_entry;
  -- drop table acl_object_identity;
  -- drop table acl_class;
  -- drop table acl_sid;
  
  
  create table acl_sid(
      id bigint generated by default as identity(start with 100) not null primary key,
      principal boolean not null,
      sid varchar_ignorecase(100) not null,
      constraint unique_uk_1 unique(sid,principal));
  
  create table acl_class(
      id bigint generated by default as identity(start with 100) not null primary key,
      class varchar_ignorecase(100) not null,
      constraint unique_uk_2 unique(class)
  );
  
  create table acl_object_identity(
      id bigint generated by default as identity(start with 100) not null primary key,
      object_id_class bigint not null,
      object_id_identity bigint not null,
      parent_object bigint,
      owner_sid bigint,
      entries_inheriting boolean not null,
      constraint unique_uk_3 unique(object_id_class,object_id_identity),
      constraint foreign_fk_1 foreign key(parent_object)references acl_object_identity(id),
      constraint foreign_fk_2 foreign key(object_id_class)references acl_class(id),
      constraint foreign_fk_3 foreign key(owner_sid)references acl_sid(id)
  );
  
  create table acl_entry(
      id bigint generated by default as identity(start with 100) not null primary key,
      acl_object_identity bigint not null,
      ace_order int not null,
      sid bigint not null,
      mask integer not null,
      granting boolean not null,
      audit_success boolean not null,
      audit_failure boolean not null,
      constraint unique_uk_4 unique(acl_object_identity,ace_order),
      constraint foreign_fk_4 foreign key(acl_object_identity) references acl_object_identity(id),
      constraint foreign_fk_5 foreign key(sid) references acl_sid(id)
  );
  