Add option to delete local database if fails to load

js/main.js

@@ -63,6 +63,12 @@ function retrievePacketList() {
 async function loadPacketList(data) {
   let sessions = await window.db.session.toArray().catch(function(error) {
     console.log("Error loading session", error);
+    $("#database-error").text("Error loading the database, schema has probably changed and needs updating. You will probably need to delete the local database.")
+    delete_button = $("<button>").click(()=>{
+      window.indexedDB.deleteDatabase("answers_database");
+      location.reload();
+    })
+    $("#database-error").append("")
   });
   // db.session
   //   .where("packet")