Stop user-cred from counting reverse linked-account edges - #165
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Stop user-cred from counting reverse linked-account edges#165Pitchfork-and-Torch wants to merge 1 commit into
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Account-expansion pairs are undirected. Matching only (userId, linkedUserId) left alt→main follows and engagements in the PageRank graph, so linked alts could still pump mass into the primary account. Co-authored-by: Jon Bailey <Pitchfork-and-Torch@users.noreply.github.com>
This was referenced Sep 7, 2026
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Bug
filterLinkedUserEdgesexists to keep linked-account pairs out of UserCred PageRank. It joined follow and engagement edges on the exact ordered pair(userId, linkedUserId)fromAccountExpansionInvestigations.That dataset is an undirected investigation pair, not a graph edge. Flock follows and 7-day fav/RT edges are oriented the other way: follower→followee, engager→author. Mass flows that same direction.
Proof
(mainId, altId).(altId, mainId).(altId, mainId)≠(mainId, altId)→ edge kept.isHighPageRankV2/cred.score. Abuse enforcement skips oncred.is_high || cred.score >= 50. Safety-label user-agg excludes high page-rank users from NSFW account labels.Main→alt was the only direction dropped — the one that does not inflate the primary.
Fix
Emit both orders of each linked pair (skip self-pairs).
filterLinkedUserEdgesis unchanged. If the snapshot already stores both directions, the extra keys are a no-op.One file:
user-cred-v2/UserCredV2App.scala.Not a home-mixer / VF / Thunder change. Not a fork PR.