WPB-20429 Replace the members of a channels (for TM)

[battermann]

https://wearezeta.atlassian.net/browse/WPB-20429

Checklist

• Add a new entry in an appropriate subdirectory of changelog.d
• Read and follow the PR guidelines

[Copilot]

Pull Request Overview

This PR extends the PUT /conversations/:domain/:conv_id/members endpoint to support user groups. When replacing members in a conversation (specifically channels), the implementation now ensures that members added via user groups are preserved and not removed during the replace operation.

Key Changes

• Added UserGroupStore effect to Galley's effect stack to enable querying user groups associated with conversations
• Modified replaceMembers function to fetch user groups for a conversation and merge their members with invited users
• Updated the member removal logic to handle channels with non-member admins appropriately
• Added integration test demonstrating the feature with user groups

Reviewed Changes

Copilot reviewed 10 out of 10 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
services/galley/src/Galley/Effects.hs	Added UserGroupStore to Galley's effect stack
services/galley/src/Galley/App.hs	Integrated Postgres interpreter for UserGroupStore
services/galley/src/Galley/API/Update.hs	Modified replaceMembers to preserve user group members and handle channel removal logic
services/galley/galley.cabal	Added vector dependency
services/galley/default.nix	Added vector dependency
libs/wire-subsystems/src/Wire/UserGroupStore.hs	Added GetUserGroupsForConv operation
libs/wire-subsystems/src/Wire/UserGroupStore/Postgres.hs	Implemented getUserGroupsForConv with SQL query
libs/wire-subsystems/test/unit/Wire/MockInterpreters/UserGroupStore.hs	Added mock implementation for getUserGroupsForConv
integration/test/Test/Channels.hs	Added integration test for member replacement with user groups
changelog.d/2-features/WPB-20429	Updated changelog with PR reference

Comments suppressed due to low confidence (1)

services/galley/src/Galley/API/Update.hs:1124

• The comment says 'Add members first', but the actual order is: additions first (line 1124-1129), then removals (line 1131-1142). This is confusing as the function documentation at line 1057 says 'executing removals followed by additions'. The comment should be corrected to match the actual implementation order.

    -- Add members first

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.