Phase1: Schema + skill event tracking

src/app/api/admin/tenants/[name]/delete/route.ts

@@ -4,6 +4,7 @@ import { getTenant, deleteTenant } from "@/lib/k8s";
 import {
   markTenantRequestDeletedByTenantName,
   removeAllAssignmentsForTenant,
+  recordTenantDeleted,
 } from "@/lib/db";
 import { safeError } from "@/lib/errors";
 
@@ -49,6 +50,15 @@ export async function POST(
       console.error("Failed to clean up tenant assignments:", e)
     );
 
+    // Billing — Phase 1: stamp deletion timestamp on the lifecycle
+    // row so the final invoice covering the deletion month can
+    // prorate correctly. Idempotent at the DB layer; a missing
+    // lifecycle row (e.g. pre-Phase-1 tenants that haven't been
+    // backfilled yet) makes this a no-op.
+    await recordTenantDeleted(name).catch((e) =>
+      console.error("billing: failed to stamp tenant deletion:", e)
+    );
+
     return NextResponse.json({
       message: "Tenant deletion initiated. The operator will clean up all resources.",
     });