Is there a way to retroactively update trust level and title for existing group members?

Support
2

The only way is to use the rails console. You will need the id of the group.

cd /var/discourse
./launcher enter app
rails c
user_ids = GroupUser.where(group_id: <group_id>).pluck(:user_id)
User.where(id: user_ids).where("LENGTH(COALESCE(title, '')) = 0").update_all(title: "awesome title")
User.where(id: user_ids).where(trust_level: TrustLevel[0]).update_all(trust_level: TrustLevel[1])
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