SOLVED ... Sqlite insert 2 readings on the same row?

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Are you sure? Has the Timestamp table got two columns? Though I would have expected an error if it were that.
Put a debug node on the output of the sqlite node and set it to show Full Message. Then inject your query. Expand the debug to show everything returned and post an image here.
Run the command line sqlite client and execute
select * from Timestamp;
and post the result here. Alternatively run that query in node-red and post the result.