Introduction
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Activate logging
$GLOBALS['PCT_CUSTOMCATALOG']['debug'] = true;

### Filter logs

Log: MY-TABLE.id=-1000
Type: SQL query
Status: List has no active filter and is supposed to display an empty result due to list module settings

Log: MY-TABLE.id=-1
Type: SQL query
Status: A filter returns a negative result to display an empty list

Log: MY-TABLE.id=-500
Type: SQL query
Status: A protection filter clears the list because no frontend user is logged in and list setting is show all entries is false

Log: MY-TABLE.id=-[FILTER-ID]
Type: SQL query
Status: A strict filter returns a negative result to display an empty list or impossible result

Log: MY-TABLE.id=-100
Type: SQL query
Status: The "filter active language" (list module option) filter returns a negative result to display an empty list or impossible result