Parsed test spec with 3 sessions

starting permutation: ddrop cconvert dend cstate
step ddrop: BEGIN; DROP INDEX iso_cv_a;
step cconvert: SELECT sift.col_track_convert() AS converted; <waiting ...>
step dend: COMMIT;
step cconvert: <... completed>
converted
---------
        2
(1 row)

step cstate: SELECT * FROM iso_cv_state();
triggers|depend_on_trigger|dangling
--------+-----------------+--------
       2|                2|       0
(1 row)