Initial import: property management SaaS + security hardening + admin dashboard

Property Management Network — Next.js 16 (App Router), Better Auth,
Drizzle ORM over PostgreSQL, Stripe, OpenAI, Resend.

Includes:
- Security hardening: access-control/IDOR fixes, TLS-by-default DB layer,
  constant-time cron auth, strict security headers, atomic AI quota gating,
  HTML/email output encoding, demo-backdoor disabled in production.
- Superadmin dashboard at /admin (overview/MRR, server-paginated users with
  ban/impersonate/plan/delete, billing, platform activity + admin audit log,
  AI usage, system health) via the Better Auth admin plugin.
- Seed/migration utility scripts under scripts/.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

app/api/stripe/webhook/route.ts

@@ -0,0 +1,113 @@
+import { NextResponse } from "next/server"
+import { eq } from "drizzle-orm"
+import { stripe } from "@/lib/stripe/client"
+import { db } from "@/lib/db"
+import { profiles, rent_payments } from "@/lib/db/schema"
+import type Stripe from "stripe"
+
+export async function POST(request: Request) {
+  const body = await request.text()
+  const sig = request.headers.get("stripe-signature")!
+
+  let event: Stripe.Event
+
+  try {
+    event = stripe.webhooks.constructEvent(body, sig, process.env.STRIPE_WEBHOOK_SECRET!)
+  } catch (err: unknown) {
+    const message = err instanceof Error ? err.message : "Unknown error"
+    return NextResponse.json({ error: `Webhook error: ${message}` }, { status: 400 })
+  }
+
+  // Webhooks are not user-scoped: they identify the target row by the id /
+  // customer id stored in Stripe metadata. There is no RLS to bypass anymore.
+  switch (event.type) {
+    case "checkout.session.completed": {
+      const session = event.data.object as Stripe.Checkout.Session
+      const userId = session.metadata?.supabase_user_id
+      const plan = session.metadata?.plan
+
+      if (!userId || !plan) break
+
+      if (session.mode === "payment") {
+        // Lifetime plan
+        await db
+          .update(profiles)
+          .set({ plan: "lifetime", subscription_status: "active" })
+          .where(eq(profiles.id, userId))
+      }
+      break
+    }
+
+    case "customer.subscription.created":
+    case "customer.subscription.updated": {
+      const subscription = event.data.object as Stripe.Subscription
+      const userId = subscription.metadata?.supabase_user_id
+      const plan = subscription.metadata?.plan
+
+      if (!userId) break
+
+      await db
+        .update(profiles)
+        .set({
+          plan: (plan ?? "starter") as typeof profiles.$inferSelect.plan,
+          stripe_subscription_id: subscription.id,
+          subscription_status: subscription.status,
+          plan_expires_at: (subscription as any).current_period_end
+            ? new Date((subscription as any).current_period_end * 1000).toISOString()
+            : null,
+        })
+        .where(eq(profiles.id, userId))
+      break
+    }
+
+    case "customer.subscription.deleted": {
+      const subscription = event.data.object as Stripe.Subscription
+      const userId = subscription.metadata?.supabase_user_id
+
+      if (!userId) break
+
+      await db
+        .update(profiles)
+        .set({
+          plan: "starter",
+          stripe_subscription_id: null,
+          subscription_status: "canceled",
+          plan_expires_at: null,
+        })
+        .where(eq(profiles.id, userId))
+      break
+    }
+
+    case "invoice.payment_failed": {
+      const invoice = event.data.object as Stripe.Invoice
+      const customerId = invoice.customer as string
+
+      await db
+        .update(profiles)
+        .set({ subscription_status: "past_due" })
+        .where(eq(profiles.stripe_customer_id, customerId))
+      break
+    }
+
+    // Rent payment completed via payment link
+    case "payment_intent.succeeded": {
+      const intent = event.data.object as Stripe.PaymentIntent
+      if (intent.metadata?.type !== "rent_payment") break
+
+      const paymentId = intent.metadata?.payment_id
+      if (paymentId) {
+        await db
+          .update(rent_payments)
+          .set({
+            status: "paid",
+            paid_date: new Date().toISOString().slice(0, 10),
+            stripe_payment_intent_id: intent.id,
+          })
+          .where(eq(rent_payments.id, paymentId))
+      }
+      break
+    }
+  }
+
+  return NextResponse.json({ received: true })
+}