text:  
     CREATE TABLE "user" 
    (
       usr_id         SERIAL,
       usr_username   VARCHAR(255),
       usr_name       VARCHAR(255),
       usr_password   VARCHAR(255),
       PRIMARY KEY (usr_id)
    );
    
      CREATE TABLE folder 
    (
       fol_id         SERIAL,
       fol_name       VARCHAR(255),
       fol_usr_id     BIGINT,
       PRIMARY KEY (fol_id),
       CONSTRAINT fk_fol_usr_id 
         FOREIGN KEY(fol_usr_id) 
  	   REFERENCES "user"(usr_id)
    );
    
    CREATE TABLE task 
    (
       tak_id         SERIAL,
       tak_order      SMALLINT DEFAULT 0,
       tak_text       VARCHAR(255),
       tak_done       BOOLEAN DEFAULT FALSE,
       tak_fol_id     BIGINT,
       PRIMARY KEY (tak_id),
       CONSTRAINT fk_tak_fol_id 
         FOREIGN KEY(tak_fol_id) 
  	   REFERENCES folder(fol_id)
    );
    
  