Tweak runs cleanup

For each repository, keep last run of each type+status instead of
just status. Otherwise, in the case infrequent fetches (for pessimized
repositories), but frequent successful parses, latest successful fetch
run may be removed, leaving either no fetch runs, or a (much older)
failed fetch run.

Author: AMDmi3

sql.d/update/update_post.sql

@@ -29,15 +29,15 @@ WITH preserved_runs AS (
 				ORDER BY start_ts DESC
 			) AS depth,
 			row_number() OVER (
-				PARTITION BY repository_id, status
+				PARTITION BY repository_id, type, status
 				ORDER BY start_ts DESC
 			) AS status_depth
 		FROM runs
 	) AS tmp
 	WHERE
 		-- keep failed runs for some time (assuming someone may keep a link to them)
 		(status = 'failed'::run_status AND start_ts > now() - INTERVAL '31' DAY) OR
-		-- keep last run of any kind (limiting age here allows last failed runs to expire)
+		-- keep last run of each kind (limiting age here allows last failed runs to expire)
 		(start_ts > now() - INTERVAL '31' DAY AND status_depth = 1) OR
 		-- keep normal runs for some time
 		(start_ts > now() - INTERVAL '3' DAY) OR