fix bug and varname metdata files

core.py

@@ -131,7 +131,7 @@ def fetch_epics():
             val = ca.get_complete_with_metadata(chid, ftype=14)
             timestamp = calendar.timegm(
                 datetime.datetime.utcfromtimestamp(val['timestamp']).timetuple())
-            pvdata[ca.name(chid)] = {
+            pvdata[pvs[idx]] = {
                 'timestamp': timestamp,
                 'value': val['value']
             }