feat(dashboard): surface exclusive managed leases in Sessions view (#11389)

Merged into release/v3.8.51 via batch validation: exclusive-session-observability unit+UI suites green on the combined tree, static gates green. Nice additive observability layer over the #10362 lease backend — thanks @KaspaPulse!

src/app/api/sessions/route.ts

@@ -5,13 +5,44 @@ import {
   getAllActiveSessionCountsByKey,
 } from "@omniroute/open-sse/services/sessionManager.ts";
 import { sanitizeErrorMessage } from "@omniroute/open-sse/utils/error";
+import { getExclusiveLeaseConnectionIds } from "@/lib/db/apiKeys";
+import { getExclusiveLeaseOccupancy } from "@/lib/db/exclusiveConnectionLeases";
+import { getProviderConnectionDisplayMetadata } from "@/lib/db/providers";
+import { getAccountDisplayName } from "@/lib/display/names";
+import { getPendingRequests } from "@/lib/usage/usageHistory";
+import { buildExclusiveDashboardSessions } from "@/lib/sessionObservability";
 
 export async function GET() {
   try {
     const sessions = getActiveSessions();
     const count = getActiveSessionCount();
     const byApiKey = getAllActiveSessionCountsByKey();
-    return NextResponse.json({ count, sessions, byApiKey });
+
+    // Reuse the hard-lease authority added by #10362. The API-key policy derives
+    // the managed candidate set; SQLite occupancy is the source of truth for
+    // which of those connections are actually leased right now.
+    const managedConnectionIds = Array.from(await getExclusiveLeaseConnectionIds());
+    const occupancy = getExclusiveLeaseOccupancy(managedConnectionIds);
+    const leasedConnectionIds = new Set(occupancy.keys());
+    const connectionNames = new Map(
+      getProviderConnectionDisplayMetadata([...leasedConnectionIds]).map((connection) => [
+        connection.id,
+        getAccountDisplayName(connection),
+      ])
+    );
+    const exclusiveSessions = buildExclusiveDashboardSessions(
+      leasedConnectionIds,
+      getPendingRequests().byAccount,
+      sessions,
+      connectionNames
+    );
+
+    return NextResponse.json({
+      count,
+      sessions,
+      byApiKey,
+      exclusiveSessions,
+    });
   } catch (error) {
     return NextResponse.json({ error: sanitizeErrorMessage(error) }, { status: 500 });
   }