IndexedDB Cursors: Iterate Large Datasets Efficiently

Think of an IndexedDB cursor as a database pointer for your browser's storage. Instead of pulling an entire object store into memory with `getAll()`, a cursor lets you iterate through records one by one, dramatically reducing memory usage for large datasets. This is essential for performance when you need to read or update many records, like searching thousands of cached articles. The most common mistake is forgetting to call `cursor.continue()` within the `onsuccess` handler; without it, your loop only processes the first record.