routertools/config: Add minimum time difference for router stats

This prevents errors due to the same router being sent twice in
the same second.

Signed-off-by: Adrian Schmutzler <freifunk@adrianschmutzler.de>

ffmap/config.py

@@ -8,6 +8,7 @@ CONFIG = {
 	"orphan_threshold_days": 7,
 	"delete_threshold_days": 180,
 	"router_stat_days": 14,
+	"router_stat_mindiff_secs": 10,
 	"event_num_entries": 20,
 	"global_stat_days": 30,
 	"csv_dir": "/var/lib/ffmap/csv",

ffmap/routertools.py

@@ -322,7 +322,7 @@ def set_status(mysql,router_id,status):
 		router_id,))
 
 def new_router_stats(mysql, router_id, uptime, router_update):
-	if uptime < router_update["sys_uptime"]:
+	if (uptime + CONFIG["router_stat_mindiff_secs"]) < router_update["sys_uptime"]:
 		time = mysql.utctimestamp()
 		
 		mysql.execute("""