Add option to delete local database if fails to load

index.html

@@ -157,6 +157,9 @@
     <div id="packet-history" class="fullscreen-overlay">
     </div>
 
+    <div id="database-error" class="fullscreen-overlay">
+    </div>
+
     <script src="https://unpkg.com/uuid@latest/dist/umd/uuidv4.min.js" type="module"></script>
     <script src="lib/jquery-3.4.1.min.js" type="text/javascript"></script>
     <script src="lib/notify.min.js" type="text/javascript"></script>

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")