CREATE TABLE calendar (
      id	integer not null GENERATED ALWAYS AS IDENTITY (START WITH 1 INCREMENT BY 1),
      title	varchar(255) NOT NULL,
      description	varchar(255),
      start_date	date NOT NULL,
      start_time	time,
      end_date	date,
      end_time	time,
      recurrence	varchar(1),
      period	varchar(1),
      category		integer,
      id_api            varchar(255),
      id_event_google            varchar(255),
      recur_info        varchar(255),
      event_color		varchar(255),
      creator varchar(255),
      reminder varchar(255),
      PRIMARY KEY (id)
    )