mysql/trigger: Add trigger for LOADED -> INQ transition

Add group maintenace for new job LOADED -> INQ tansition. This is the
reverse of the maintenace for the ASSIGNED -> LOADED transition.

mysql/create_trigger.sql

@@ -142,6 +142,16 @@ CREATE TRIGGER mxq_update_job BEFORE UPDATE ON mxq_job
                     stats_total_real_sec_finished  = stats_total_real_sec_finished  + NEW.stats_real_sec
                 WHERE group_id = NEW.group_id;
 
+            -- LOADED (150) -> INQ(0)
+            ELSEIF NEW.job_status = 0 AND OLD.job_status IN (150) THEN
+
+                UPDATE mxq_group SET
+                    group_sum_starttime = group_sum_starttime - UNIX_TIMESTAMP(OLD.date_start) * NEW.host_slots,
+                    group_jobs_inq      = group_jobs_inq      + 1,
+                    group_jobs_running  = group_jobs_running  - 1,
+                    group_slots_running = group_slots_running - OLD.host_slots
+                WHERE group_id = NEW.group_id;
+
             -- * -> NOT IN [ CANCELLING(989) | CANCELLED(990) ]
             ELSEIF NEW.job_status NOT IN (989, 990) THEN