Fix/6615 40 varchar limit on model name

[crazywoola]

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Fixes #6615

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[laipz8200]

LGTM

[mbbyn]

@crazywoola the column causing the problems is model_name as oppose to provider_name.

I have pulled main to test, and was facing the same issue.

[mbbyn]

Also noticed that the table name is embeddings, but in the reported issue the problematic table is dataset_collection_bindings. Perhaps the size changes are required in multiple places?