entity query and record progress

backends/sqlite/include/sqlite_connection.hpp

@@ -33,14 +33,14 @@ public:
 
   size_t execute(const std::string &stmt) override;
 
-  sql::record describe(const std::string& table) override;
+  std::vector<sql::column_definition> describe(const std::string& table) override;
 
   bool exists(const std::string &schema_name, const std::string &table_name) override;
 
 private:
   struct fetch_context
   {
-    sql::record prototype;
+    std::vector<sql::column_definition> prototype;
     sqlite_result_reader::rows rows;
   };