Use an UPSERT SQL query to insert or update the projection version #52
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Remove obsolete `changeset/2` function from projection version schema.
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To guarantee that an event cannot be projected more than once an "UPSERT" query is now used to INSERT or UPDATE the last seen event in the projection versions table. Using a single SQL statement will guard against concurrent handling of the same event since only one process will be able to successfully update (or insert) the projection version.