This example demonstrates a Leaflet-based web map that lets users create, edit, and delete point markers, with changes persisted to a CARTO points-geometry table. It uses Leaflet.draw for the interactive drawing controls and CARTO’s SQL API to read and write GeoJSON features. The map is initialized with a CARTO basemap, and existing points from a CARTO table are loaded via a `cartodb.SQL` query and added to a `L.FeatureGroup`. A custom `persistOnCartoDB` function handles UPDATE, INSERT, and DELETE actions by constructing parameterized SQL statements, which are executed through a security-definer PostgreSQL function to modify the underlying table. The example demonstrates a full read–edit–write workflow for point data, with hooks for the Leaflet.draw events.