How can I store multiple TinyDB entries under a single tag?

I'm making a lucid dreaming app and I want my database to store multiple entries under the tag "dream". But every time I save another entry, the last one gets overwritten, and I don't really think releasing an app that can save one dream at a time would have been a good idea.

4 posts were merged into an existing topic: Can I assign 2 tags to a TinyDB entry?