Delete all database values

this might work

function clear() {
	//let user = wixUsers.currentUser; 
	//let userId = user.id; 
	// const itemId = event.context.itemId; // this is the item in the repeater assuming that the button is in the repeater.
	wixData.query("yourdatabase") // get the item from the database collection.
	.eq("userId")// if any specific field ("userId", userId)
	.find()
    .then((results) => {
	  removeItems(results.items);
	    console.log(removeItems);
});
}
async function removeItems(items) {
    items.forEach(async (item, i) => {
        await wixData.remove("yourdatabase", items[i]._id);
        console.log(removeItems);
    });
}