Change /share to create geoposition, /geo?id to update by id

bin/routes/geo_routes.dart

@@ -29,19 +29,30 @@ class GeoRoutes {
   }
 
   Future<Response> _updatePosition(Request request) async {
+    final id = int.parse(request.url.queryParameters['id']!);
     final body = await request.readAsString();
     final data = jsonDecode(body);
 
     final x = data['x'];
     final y = data['y'];
 
-    final position = await database.updatePosition(x, y);
+    final position = await database.updatePosition(id, x, y);
     return Response(200, body: position.toJson());
   }
 
   Future<Response> _createShare(Request request) async {
+    final body = await request.readAsString();
+    final data = jsonDecode(body);
+
+    final x = data['x'];
+    final y = data['y'];
+
+    final position = await database.createPosition(x, y);
     final shareId = database.createShareId();
 
-    return Response(200, body: jsonEncode({'share_id': shareId}));
+    return Response(201, body: jsonEncode({
+      'geo_id': position.id,
+      'share_id': shareId
+    }));
   }
 }