One more fix for the SQL, job_groups table have time_completed as wel…

…l causing Error: Column 'time_completed' in where clause is ambiguous. (#340)

batch/batch/front_end/front_end.py

@@ -406,7 +406,7 @@ async def get_completed_batches_ordered_by_completed_time(request, userdata):
     last_completed_timestamp = request.query.get('last_completed_timestamp')
     if last_completed_timestamp:
         where_args.append(int(last_completed_timestamp))
-        wheres.append('time_completed < %s')
+        wheres.append('batches.time_completed < %s')
 
     sql = f"""
 SELECT batches.*,
@@ -441,7 +441,7 @@ async def get_completed_batches_ordered_by_completed_time(request, userdata):
 ) AS cost_t ON TRUE
 WHERE
     {' AND '.join(wheres)}
-ORDER BY time_completed DESC
+ORDER BY batches.time_completed DESC
 LIMIT %s;
     """