The whole forum schema lands at once — threads, posts, the moderation ledger and
upload attribution — including the columns only phase 5's discussion threads use.
That is TEAMS.md 5.1's split BY LAYER rather than by feature: phase 5 opens paths
instead of migrating data.
Three settings keys, and only one of them is ordinary. `teams_forums_enabled` and
`teams_forum_images` are enum keys on the existing admin settings endpoint;
`teams_forum_images` also carries a server-side PRECONDITION, which is why the
three live in their own model rather than in the generic setMany() loop where a
reader would never find it.
The gate is the server's. `PUT teams_forum_images = 'uploads'` is rejected 400
unless the same request carries the acknowledgement version — the admin checkbox
is how the gate is presented, never the gate. What is stored is the TEXT VERSION,
so "which wording did they agree to" is answerable later; settings already record
updated_by/updated_at, and an activity_log row puts it in the staff audit trail.
A reworded notice makes a stored acknowledgement stale, and neither obvious answer
is right: uploads KEEP WORKING, and no other forum setting may be saved until it is
re-given. Non-destructive, and impossible to ignore.
Both reads fail closed. A DB fault reports the forum off and images disabled — a
forum that 404s for a minute is the cheap failure; a policy that is not a policy
is not.
Co-Authored-By: Claude <noreply@anthropic.com>