+OPTIMIZATIONS
+
+* Revisit result-type list creation, perhaps caching
+* Rework LIST-ATTRIBUTE-TYPES and LIST-INDEXES such that they exhibit their
+ current behaviours using single database queries.
+* Possible use of cached attribute type information for operations which
+ insert/update records as mentioned in the CommonSQL user guide.
+* Extend caching of generated SQL strings to more complex expressions which
+ are likely to be repeatedly executed many times.
+
+POSSIBLE EXTENSIONS
+
+* improve large object api and extend to databases beyond postgresql
+* add support for prepared statements
+
+RACE CONDITIONS
+* sql/databases.lisp: *connected-databases* is shared globally but not modified in a threadsafe manner.