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CREATE INDEX ON cities USING GIST (geom);

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host    your_database    felt_user    felt_ip_range    md5

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CREATE TABLE cities (
    id SERIAL PRIMARY KEY,
    name VARCHAR(100),
    geom GEOMETRY(Point, 4326)
);

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CREATE USER felt_user WITH PASSWORD 'your_secure_password';
GRANT CONNECT ON DATABASE your_database TO felt_user;
GRANT USAGE ON SCHEMA public TO felt_user;
GRANT SELECT ON ALL TABLES IN SCHEMA public TO felt_user;
-- Grant select permission on future tables
ALTER DEFAULT PRIVILEGES IN SCHEMA public GRANT SELECT ON TABLES TO felt_user;

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CREATE EXTENSION postgis;

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let mode: "idle" | "dragging" = "idle"
const dragHandler: InteractionHandler = {
  onDragStart(gesture, app) {
    if (intersection(gesture.elementsUnderCursor, app.selectedElements).size) {
      mode = "dragging";
    }
  },

  onPointerMove(gesture) {
		// ignore pointer-moves when we haven't started dragging

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if (isScreenshot) return;
if (!isEditor) return;
if (isOnMap(event)) return;
if (sidebarState.displayedItem !== "comments") return;
if (hasDragged.check(event)) return;
if (currentTool !== "NONE") return;
if (isPanning) return;
if (isZooming) return;
if (event.shiftKey) return;

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<MapPosition>
  <DragBox>
    <SVGPolygon
      path={pathFromCoordinates(
        element.coords,
        viewport
      )} />
  </DragBox>
  <SelectionFrame
    polygon={selectionFramePolygon(element.coords, viewport)} />

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const cache = new WeakMap<ElementCoords, Path2D>()
function getCachedPath(element) {
  const fromCache = cache.get(element.coords)
  if (fromCache) return fromCache;

  const path = calculatePath(element.coords);
  cache.set(element.coords, path);
  return path;
}

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function getFullRouteGeometry(coords, viewport) {
  const roundedZoom = Math.round(viewport.zoom)
  const fromCache = cache.get(roundedZoom).get(coords)
  if (fromCache) return clipToViewport(fromCache, viewport);

  const simplified = simplify(coords, 1 / roundedZoom)
  cache.get(roundedZoom).set(coords, simplified);

  return clipToViewport(simplified, viewport);
}