fix for date

Author: Vladimir Ershov

pgpro_scheduler--2.0.sql

@@ -405,8 +405,11 @@ DECLARE
 	clean_cron jsonb;
 	N integer;
 	name text;
+	updatePrev boolean;
 BEGIN
 
+	updatePrev := true;
+
 	IF NOT params?'cron' AND NOT params?'rule' AND NOT params?'date' AND NOT params?'dates' THEN
 		RAISE  EXCEPTION 'There is no information about job''s schedule'
 			USING HINT = 'Use ''cron'' - cron string, ''rule'' - json to set schedule rules or ''date'' and ''dates'' to set exact date(s)';
@@ -416,13 +419,11 @@ BEGIN
 		EXECUTE 'SELECT cron2jsontext($1::cstring)::jsonb' 
 			INTO cron
 			USING params->>'cron';
-		IF prev IS NOT NULL THEN
-			cron := prev || cron;
-		END IF;
 	END IF;
 
 	IF params?'rule' THEN
 		rule := params->'rule';
+		updatePrev := false;
 	END IF;
 
 	cron := coalesce(cron, '{}'::jsonb) || coalesce(rule, '{}'::jsonb);
@@ -448,6 +449,10 @@ BEGIN
 		cron := cron || jsonb_build_object('dates', array_to_json(dates));
 	END IF;
 
+	IF updatePrev AND prev IS NOT NULL THEN
+		cron := prev || cron;
+	END IF;
+
 	clean_cron := '{}'::jsonb;
 	FOR name IN SELECT * FROM unnest('{dates, crontab, onstart, days, hours, wdays, months, minutes}'::text[])
 	LOOP