Posts generated in database

Every time I change the footer widget title color in the customizer, a new post is generated in the database with the following code. The post status = trash. Is it safe to delete these from the database? When are these posts removed automatically from the database?

{
"generate_settings[footer_widget_title_color]": {
"value": "#c74a4a",
"type": "option",
"user_id": 1,
"date_modified_gmt": "2018-04-25 16:47:30"
}
}