CollectionAttributeValue table - which name is correct?

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Hi, I am getting a 1062 duplicate key error on the CollectionAttributeValue table. What table name should be used? I have both CollectionAttributeValue and _CollectionAttributeValue.

Both of these tables have content. The former has thousands of rows.

Additionally, I have around 8 tables that all have a _ prefix. Is my page trying to force update content in the wrong table?