updated db pool limits, added logs VACUUM, updated api docs

daos/table.go

@@ -35,3 +35,11 @@ func (dao *Dao) DeleteTable(tableName string) error {
 
 	return err
 }
+
+// Vacuum executes VACUUM on the current dao.DB() instance in order to
+// reclaim unused db disk space.
+func (dao *Dao) Vacuum() error {
+	_, err := dao.DB().NewQuery("VACUUM").Execute()
+
+	return err
+}