CREATE INDEX &mw_prefix.archive_i01 ON &mw_prefix.archive (ar_namespace,ar_title,ar_timestamp);
CREATE INDEX &mw_prefix.archive_i02 ON &mw_prefix.archive (ar_user_text,ar_timestamp);
CREATE INDEX &mw_prefix.ar_actor_timestamp ON &mw_prefix.archive (ar_actor,ar_timestamp);
-CREATE INDEX &mw_prefix.archive_i03 ON &mw_prefix.archive (ar_rev_id);
+CREATE UNIQUE INDEX &mw_prefix.archive_i04 ON &mw_prefix.archive (ar_rev_id);
/*$mw$*/
CREATE TRIGGER &mw_prefix.archive_seq_trg BEFORE INSERT ON &mw_prefix.archive
FOR EACH ROW WHEN (new.ar_id IS NULL)