Fix table updates #49
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SQLAlchemy maps specific instances to the objects in the database. If the object is mutated in-place, adding it to the table again will issue an UPDATE, but if the object is replaced with a new instance, you need to delete it first, then re-add it, otherwise it will fail the UNIQUE constraint, since it's trying to add the same thing twice.
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This fixes an issue where updating existing entries in the database would fail because they were not being properly deleted first.