Fix: link share_id to geo_id so /watch returns correct position

bin/routes/auth_routes.dart

@@ -61,13 +61,14 @@ class AuthRoutes {
 
   Future<Response> _watch(Request request, String login) async {
     final uniqueId = request.url.queryParameters['unique_id'];
+    final geoId = database.getGeoIdByShareId(uniqueId!);
 
-    if (!database.isValidShareId(uniqueId!)) {
+    if (geoId == null) {
       await database.createLog(login, 'Accessed invalid share link');
       return Response(404, body: jsonEncode({'error': 'Share link not found'}), headers: {'Content-Type': 'application/json'});
     }
 
-    final position = await database.getLatestPosition();
+    final position = await database.getPositionById(geoId);
 
     if (position == null) {
       await database.createLog(login, 'Accessed share link - no position');

bin/routes/geo_routes.dart

@@ -37,7 +37,7 @@ class GeoRoutes {
     final y = data['y'];
 
     final position = await database.createPosition(x, y);
-    final shareId = database.createShareId();
+    final shareId = database.createShareId(position.id);
 
     await database.createLog(login, 'Created share link geo_id=${position.id}');
     return Response(201, body: jsonEncode({