For the last row of a snapshot, we emit snapshot="last" in the source record. For the first row of a snapshot, we emit snapshot="first". However, these conflict when there is exactly one row. From looking at the code, it seems we just emit "last" there, which might confuse code that relies on knowing when a snapshot starts.

A similar issue applies to the per-table values.

Implementation ideas (optional)

Something like snapshot="only" should be emitted.