- cql:cql_dependency_hook(+EntitySet, +Module)can be 
defined to be notified when a given Module references a list of database 
entities. This can be used to manage metadata/code dependency
- cql:cql_generated_sql_hook(+Filename, +LineNumber, +Goals)can be defined to examine generated SQL. Usecql_sql_clause(+Goals, -SQL, -Parameters)to examine the goals
- cql:cql_index_suggestion_hook(+Index)can be defined if 
you are interested in proposed indices for your schema. Note that this 
is not very mature (yet)