fix(backup): edge-case where backup/restore would fail

Author: jagandeepbrar

lib/database/tables/bios.dart

@@ -13,4 +13,32 @@ enum BIOSDatabase<T> with LunaTableMixin<T> {
   final T fallback;
 
   const BIOSDatabase(this.fallback);
+
+  @override
+  dynamic export() {
+    BIOSDatabase db = this;
+    switch (db) {
+      case BIOSDatabase.BOOT_MODULE:
+        return BIOSDatabase.BOOT_MODULE.read().key;
+      default:
+        return super.export();
+    }
+  }
+
+  @override
+  void import(dynamic value) {
+    BIOSDatabase db = this;
+    dynamic result;
+
+    switch (db) {
+      case BIOSDatabase.BOOT_MODULE:
+        result = LunaModule.fromKey(value.toString());
+        break;
+      default:
+        result = value;
+        break;
+    }
+
+    return super.import(result);
+  }
 }