Node: activity-admin

R6. POST /api/members/:id/activity body { "type": "..." } → 201. type is a free string (login, post, comment, share, …) — illustrative, NOT exhaustive; any type is recorded and counted with no special code. R7. GET /api/admin/activity/dashboard → 200 { "perMember": [ { "memberId": ..., "lastAccess": "<ISO>", "actionsByType": { "<type>": <count> } } ], "activeMembers7d": <int> }. Aggregated by type (NOT raw rows); activeMembers7d = members with ≥1 action in the last 7 days; any type (e.g. share) counts. R12. The dashboard only counts activity of existing members (activity of deleted members is excluded).