I agree. Is there an industry accepted definition of what a system must do before it can be called a database? I also wrote a KV system to keep track of metada

I agree. Is there an industry accepted definition of what a system must do before it can be called a database? I also wrote a KV system to keep track of metadata (tags) for an object store I invented. I discovered that it could also be used to create relational tables and perform fast queries against them without needing separate indexes. I started calling it a database and many people complained that I was misusing the term because it can't yet do everything that Postgres, MySQL, or SQLite can do.