(t:Track:Orchard) WITH *, [node IN [ta, lp, t] WHERE node IS NOT NULL] AS nodesToLock CALL apoc.lock.nodes(nodesToLock) OPTIONAL MATCH (lp)-[:CREATED_FROM]-(sameTa:TrackArtist {type: ta.type, trackId: t.id}) WHERE sameTa.id <> ta.id FOREACH (noDup IN CASE WHEN sameTa IS NULL THEN [1] ELSE [] END | DETACH DELETE pit, ta ) FOREACH (dup IN CASE WHEN sameTa IS NOT NULL THEN [1] ELSE [] END | DETACH DELETE ta ) ", {batchSize:100, iterateList:true, parallel:false} ); ]]>