Make sure linking entries are unique

[tfardet]

Currently, linking strategy for "znex7uqxsfqn" fails with

Applying strategy: link_iterable_by_fields
Couldn't apply strategy link_iterable_by_fields:
	Object in source database can't be uniquely linked to target database.
Problematic dataset is:
{'cycle_id': 'znex7uqxsfqn',
 'filename': '(missing)',
 'term_id': 'excretaBeefCattleExceptFeedlotFedKgN',
 'transformation_id': '3'}
Possible targets include (at least one not shown):
[{'cycle_id': 'znex7uqxsfqn',
  'filename': '(missing)',
  'term_id': 'excretaBeefCattleExceptFeedlotFedKgN',
  'transformation_id': '3'},
 {'cycle_id': 'znex7uqxsfqn',
  'filename': '(missing)',
  'term_id': 'excretaBeefCattleExceptFeedlotFedKgN',
  'transformation_id': '3'},
 {'cycle_id': 'znex7uqxsfqn',
  'filename': '(missing)',
  'term_id': 'excretaBeefCattleExceptFeedlotFedKgN',
  'transformation_id': '3'}]

[Kathleen1203]

Hi did you find a solution for that?

[tfardet]

I haven't had time to look at this since, maybe @cmutel did?