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  1. MusicBrainz Server
  2. MBS-8155

Add constraints to prevent relationships between an entity and itself

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      It is possible, or was possible in the past, to add relationships between an entity and itself (MBS-8154; edit #24119669 and edit #26418520). A database constraint on each l_X_Y table with X == Y should make sure that entity0 and entity1 are different.

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            chirlu Ulrich Klauer
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