Stored as a JSON file (imported.json) in the plugin folder.
If a note is deleted from the cache but not from the vault, the next import will overwrite the file.
Use the command palette to clear or rebuild the cache as needed.
The cache is stored in $vault/.obsidian/plugins/things3-workflow/imported.json and can be manually edited if necessary.
Use the "Rebuild Things3 Workflow Cache (without importing)" command to repopulate the cache if it is lost or deleted, without creating or modifying any notes.