DELETE FROM doki8902.message_content;
DELETE FROM doki8902.comment;
DELETE FROM doki8902.post;
DELETE FROM doki8902.message_initial;
DELETE FROM doki8902.message_vote;
DELETE FROM doki8902.message;
DELETE FROM doki8902.post_category;
DELETE FROM doki8902.user_session;
DELETE FROM doki8902.user;
DELETE FROM doki8902.user_action_log;

ALTER SEQUENCE doki8902.user_id_seq RESTART;
ALTER SEQUENCE doki8902.user_action_log_id_seq RESTART;
ALTER SEQUENCE doki8902.message_id_seq RESTART;
ALTER SEQUENCE doki8902.message_content_id_seq RESTART;
ALTER SEQUENCE doki8902.post_category_id_seq RESTART;