text: DROP TABLE if exists b_learn_exceptions_log;
  DROP TABLE if exists b_learn_publish_prohibition;
  DROP TABLE if exists b_learn_rights;
  DROP TABLE if exists b_learn_rights_all;
  DROP TABLE if exists b_learn_lesson_edges;
  DROP TABLE if exists b_learn_course;
  DROP TABLE if exists b_learn_course_site;
  DROP TABLE if exists b_learn_chapter;
  DROP TABLE if exists b_learn_lesson;
  DROP TABLE if exists b_learn_question;
  DROP TABLE if exists b_learn_answer;
  DROP TABLE if exists b_learn_test;
  DROP TABLE if exists b_learn_attempt;
  DROP TABLE if exists b_learn_test_result;
  DROP TABLE if exists b_learn_gradebook;
  DROP TABLE if exists b_learn_student;
  DROP TABLE if exists b_learn_certification;
  DROP TABLE if exists b_learn_site_path;
  DROP TABLE if exists b_learn_test_mark;
  