CREATE SEQUENCE file_id_seq
  INCREMENT 1
  MINVALUE 1
  MAXVALUE 9223372036854775807
  START 1000000
  CACHE 1;

ALTER TABLE ls_files
    ALTER COLUMN id 
        SET DEFAULT NEXTVAL('file_id_seq');

DROP TABLE ls_struct CASCADE;
DROP TABLE ls_tree CASCADE;
DROP TABLE ls_classes CASCADE;
DROP TABLE ls_cmemb CASCADE;

DROP SEQUENCE ls_struct_id_seq_seq;
DROP SEQUENCE ls_tree_id_seq_seq;

DROP TABLE as_tree CASCADE;
DROP TABLE as_struct CASCADE;
DROP TABLE as_classes CASCADE;
DROP TABLE as_cmemb CASCADE;

DROP SEQUENCE as_struct_id_seq_seq;
DROP SEQUENCE as_tree_id_seq_seq;