schema: Fix sla report inconsistencies

schema/mysql/schema.sql

@@ -136,7 +136,7 @@ BEGIN
       LEAVE read_loop;
     END IF;
 
-    IF row_previous_hard_state = 99 THEN
+    IF last_hard_state = 99 OR row_previous_hard_state = 99 THEN
       SET total_time = total_time - (row_event_time - last_event_time);
     ELSEIF ((in_service_id IS NULL AND last_hard_state > 0) OR (in_service_id IS NOT NULL AND last_hard_state > 1))
       AND last_hard_state != 99
@@ -156,7 +156,11 @@ BEGIN
   END LOOP;
   CLOSE cur;
 
-  SET result = 100 * (total_time - problem_time) / total_time;
+  -- prevents division by zero crashes
+  IF total_time > 0 THEN
+      SET result = 100 * (total_time - problem_time) / total_time;
+  END IF; -- else no data available to be reported
+
   RETURN result;
 END//
 DELIMITER ;

schema/pgsql/schema.sql

@@ -39,6 +39,7 @@ DECLARE
   problem_time biguint := 0;
   total_time biguint;
   row record;
+  result decimal(7, 4);
 BEGIN
   IF in_end_time <= in_start_time THEN
     RAISE 'end time must be greater than start time';
@@ -138,7 +139,7 @@ BEGIN
     )
     ORDER BY event_time, event_prio
   LOOP
-    IF row.previous_hard_state = 99 THEN
+    IF last_hard_state = 99 OR row.previous_hard_state = 99 THEN
       total_time := total_time - (row.event_time - last_event_time);
     ELSEIF ((in_service_id IS NULL AND last_hard_state > 0) OR (in_service_id IS NOT NULL AND last_hard_state > 1))
       AND last_hard_state != 99
@@ -157,7 +158,12 @@ BEGIN
     END IF;
   END LOOP;
 
-  RETURN 100 * (total_time - problem_time) / total_time;
+  -- prevents division by zero crashes
+  IF total_time > 0 THEN
+    result := 100 * (total_time - problem_time) / total_time;
+  END IF; -- else no data available to be reported
+
+  RETURN result;
 END;
 $$;