OpenLayers modify geometry interaction and XYZ update via XHR.

OL.modifyInteraction.js

const modifyInteraction = new ol.interaction.Modify({
  source: sourceVector
});

modifyInteraction.on('modifyend', e => {

  const feature = JSON.parse(geoJSON.writeFeature(e.features.getArray()[0]));

  const xhr = new XMLHttpRequest();

  xhr.open('POST', 'https://geolytix.xyz/dev/api/location/edit/geom/update?locale=GB&layer=Scratch&table=dev.scratch&srid=3857&id=' + feature.properties.id);

  xhr.setRequestHeader('Content-Type', 'application/json');

  xhr.onload = e => {

    if (e.target.status !== 200) return;

    clearTileCache();
  };

  xhr.send(JSON.stringify(feature.geometry));

});