CREATE TABLE EXISTS usuario (
  usuario_id varchar(20) NOT NULL,
  nombre varchar(50) NOT NULL,
  apellido varchar(50) NOT NULL,
  e_mail varchar(60) NOT NULL,
  clave varchar(255) NOT NULL,
  nivel tinyint(4) NOT NULL,
  insert_user varchar(20) NOT NULL,
  insert_datetime datetime NOT NULL,
  update_user varchar(20) NOT NULL,
  update_datetime datetime NOT NULL,
  PRIMARY KEY (usuario_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

CREATE TABLE EXISTS parametros (
  parametros_id smallint unsigned NOT NULL AUTO_INCREMENT,
  max_lines_screen smallint unsigned NOT NULL,
  max_lines_export mediumint unsigned NOT NULL,
  update_user varchar(20) NOT NULL,
  update_datetime datetime NOT NULL,
  PRIMARY KEY (parametros_id)
) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;