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* fix(analytics): show per-student last seen from login and session activity Return ISO last-seen timestamps from course analytics instead of pre-formatted strings so the dashboard can format them per student. Batch-fetch last seen for all students and include session activity alongside login events for more accurate, distinct values. Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com> * fix(analytics): destructure first row from getLastLogin query results Promise.all returns an array per Drizzle select; nested destructuring is required so loggedInAt and updatedAt are read from row objects. Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com> --------- Co-authored-by: Cursor Agent <cursoragent@cursor.com> Co-authored-by: Rotimi Best <rotimi-best@users.noreply.github.com>