How do we handle lineages that have been reclassified?

[ArtPoon]

This was not an issue when we were re-processing all data de novo, but now that we are storing sequences and metadata in a local database, there is a risk that a sample of lineage X becomes re-labelled lineage Y. As a result, we would have duplicate records in the database. This would cause the pipeline to crash when it attempts to insert a new record with accession number as unique key, which collides with the existing record with the same key. This would be easy to fix by modifying the database insert statement.