Delete na pg_class e pg_type.txt

delete from pg_class where relname='tabela';
delete from pg_type where typname='tabela';

delete from pg_class where relname='sequenciador';
delete from pg_type where typname='sequenciador';

delete from pg_class where relname='index';
delete from pg_type where typname='index';

delete from pg_class where relname='Chave_primária';
delete from pg_type where typname='Chave_primária';