feat(dashboard): refine activity telemetry and maps

apps/web/src/lib/admin-metrics.ts

@@ -3,6 +3,19 @@ export interface DailyCount {
   count: number;
 }
 
+export function mergeRiskActivity<
+  T extends { userId: string; observedAt: Date },
+  S extends { userId: string | null },
+>(latestRows: T[], summaryRows: S[]) {
+  const summaries = new Map(summaryRows.flatMap((summary) => summary.userId ? [[summary.userId, summary] as const] : []));
+  return latestRows
+    .flatMap((activity) => {
+      const summary = summaries.get(activity.userId);
+      return summary ? [{ ...activity, ...summary }] : [];
+    })
+    .sort((left, right) => right.observedAt.getTime() - left.observedAt.getTime());
+}
+
 export function fillDailySeries(rows: DailyCount[], end: Date, days: number) {
   const counts = new Map(rows.map((row) => [row.day, Number(row.count)]));
   const endDay = new Date(Date.UTC(end.getUTCFullYear(), end.getUTCMonth(), end.getUTCDate()));