Add unique index to series_id for evaluations #4359
Merged
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This pull request adds a unique index to evaluations. This avoids multiple evaluations belonging to the same series.
Although a new evaluation should never be created if one already exists, it has happened in practice, resulting in further errors down the line. The unique index should result in an error upon creation, which we can then look into avoiding.
Tested on naos. Duplicate evaluations are removed, series can be deleted again.
Closes #4356 .