How to bind the default button of quick info with the custom interface and update the database

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Hello,
The following article has an example of adding custom buttons and attaching the click event to them:
https://docs.dhtmlx.com/gantt/api__gantt_quickinfo_buttons_config.html
You can use the same approach for the default buttons:

gantt.$click.buttons.edit=function(id){
  gantt.message("Custom function");
  return true;
};

Here is the snippet:
http://snippet.dhtmlx.com/5/3502823f2