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1. drop the index for Fragment.dataspace_id
2. change the uniqueness constraint for Fragment, to exclude dataspace_id
3. drop the foreign key constraint for Fragment.dataspace_id
4. drop the Fragment.dataspace_id column
5. make Fragment.anchor_id not null

It is proposed that each of the above be implemented as a separate change in the Liquibase changelog (with a corresponding rollback for each). Notably, for dropping the column (step 4), the rollback will need to repopulate the column's data. SQL will need to be written for this.

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