-only store key if necessary

packages/taler-wallet-core/src/db.ts

@@ -2772,8 +2772,10 @@ export const walletMetadataStore = {
 export interface DbDumpRecord {
   /**
    * Key, serialized with structuredEncapsulated.
+   *
+   * Only present for out-of-line keys (i.e. no key path).
    */
-  key: any;
+  key?: any;
   /**
    * Value, serialized with structuredEncapsulated.
    */
@@ -2844,10 +2846,15 @@ export function exportDb(db: IDBDatabase): Promise<DbDump> {
       store.openCursor().addEventListener("success", (e: Event) => {
         const cursor = (e.target as any).result;
         if (cursor) {
-          storeDump.records.push({
-            key: structuredEncapsulate(cursor.key),
+          const rec: DbDumpRecord = {
             value: structuredEncapsulate(cursor.value),
-          });
+          };
+          // Only store key if necessary, i.e. when
+          // the key is not stored as part of the object via
+          // a key path.
+          if (store.keyPath == null) {
+            rec.key = structuredEncapsulate(cursor.key);
+          }
           cursor.continue();
         }
       });