update for permission and destination ordering

lib/utils/database_helper.dart

@@ -98,6 +98,35 @@ class DatabaseHelper{
     return roglist;
   }
 
+  Future clearSelection() async {
+    Database db = await instance.database;
+    Map<String, dynamic> row_clear = {
+          "selected": false
+    };
+    return await db.update(
+        "destination", 
+        row_clear
+      );
+  }
+
+  Future<int> toggleSelecttion(Destination dest) async {
+    Database db = await instance.database;
+    
+    bool val = !dest.selected!;
+    Map<String, dynamic> row_target = {
+          "selected": val
+      };
+
+    await clearSelection();
+
+    return await db.update(
+        "destination", 
+        row_target,
+        where: 'location_id = ?',
+        whereArgs: [dest.location_id!]
+        );
+  }
+
   Future<int> deleteRogaining(int id) async {
     Database db = await instance.database;
     var rog = await db.delete('rog', where: "id = ${id}");