A row said nothing about when its content last changed, and the install list
could not tell who still runs an old version. `artifacts.version_at` (new
column, existing rows from `updated_at`) is stamped only when a snapshot is
replaced — a rename or share toggle leaves it — and served as `versionAt`:
skill and file rows read "Updated 3h ago", the detail sheet "Last updated".
`GET /api/artifacts/:id/installs` gives each skill install a `state` —
latest / outdated / removed / unknown — from its Claude skill copies' hash
against the newest snapshot, shown as a badge.
nntrivi2001
d09c9d6633