Hi group, I have encountered a problem when I try to call a controller 
which should return a JSON array of values from database. However in abou 1 
of 5 cases this call stucks in "loading" phase (chrome animation in tab) 
and no response is received. Data is in database, every other controller is 
working fine, cpu utilization is pretty low so is the memory and there are 
only about 10000 rows in DB. Could you please give me some hints?

Thanks, Jan

PS. The controller looks like this:

def dberrorsselect():
    """Performs sql query to get the errors in the form of list of dicts 
such as {field_name:value}. This is then transformed to json dict for 
transfer."""
    if session.tb_id:
        
max_id=tb(tb.errors.test_id==session.tb_id).select(tb.errors.id.max()).first()[tb.errors.id.max()]
        if max_id != None:
            selector_id=int(max_id)-5
        else:
            selector_id=0
        rows=tb((tb.errors.test_id==session.tb_id)&(tb.errors.id > 
selector_id)).select(tb.errors.ts, tb.errors.msg_short, tb.errors.msg_long)
        output=rows
    else:
        output=[] 
    return dict(output=output)


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