fix: resolve Slack/WorkOS user ID duplicates in chapter memberships#669
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Root cause: Users who joined chapters via Slack had their Slack user ID stored. When they later linked their WorkOS account via web login, they got a different ID. The slack_user_mappings table linked these, but membership/leader records still had the old Slack IDs, causing duplicates and broken permissions. Solution: - Add resolveToCanonicalUserId() helper to resolve Slack IDs to WorkOS IDs - Apply resolution in all write paths: addMembership, addLeader, setLeaders, addMembershipWithInterest - Apply resolution in all read/check paths: isMember, isLeader, getMembership, removeMembership, removeLeader, deleteMembership, getCommitteesLedByUser - Add migration 149 to consolidate existing duplicate records - Add canonical_user_id to WorkingGroupLeader type for frontend compatibility - Update frontend and backend leader checks to use canonical_user_id 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
- Migration 149: Use joined_at instead of UUID id for deduplication (UUIDs are not sequential, so id comparison doesn't determine age) - Empty changeset since this doesn't impact the protocol 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
Migration 149 and 150 already exist on main branch. 🤖 Generated with [Claude Code](https://claude.com/claude-code) Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
This was referenced Apr 20, 2026
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Summary
Fixes duplicate members appearing in chapter member lists and broken leader permissions when users have both Slack and web (WorkOS) accounts.
Root cause: Users who joined chapters via Slack had their Slack user ID stored (e.g.,
U1234567). When they later linked their WorkOS account via web login, they got a different ID (e.g.,user_abc). Theslack_user_mappingstable linked these together, but the membership/leader records still had the old Slack IDs.Changes
Write-time ID resolution
resolveToCanonicalUserId()helper that checksslack_user_mappingsto resolve Slack IDs to WorkOS IDsaddMembership()addLeader()setLeaders()addMembershipWithInterest()Read/check path resolution
isMember()isLeader()getMembership()removeMembership()removeLeader()deleteMembership()getCommitteesLedByUser()Data migration
Frontend compatibility
canonical_user_idtoWorkingGroupLeadertypecanonical_user_idTest plan
🤖 Generated with Claude Code