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/notifications/read/route.ts

@@ -0,0 +1,18 @@
+import { NextResponse } from "next/server"
+import { and, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { notifications } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+
+// PATCH /api/notifications/read — mark all of the user's notifications as read.
+export async function PATCH() {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  await db
+    .update(notifications)
+    .set({ read: true })
+    .where(and(eq(notifications.user_id, user.id), eq(notifications.read, false)))
+
+  return NextResponse.json({ ok: true })
+}

app/api/notifications/route.ts

@@ -0,0 +1,102 @@
+import { NextResponse } from "next/server"
+import { and, desc, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { notifications, rent_payments, maintenance_requests } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+import { sendEmail, rentDueReminderHtml, rentOverdueHtml, maintenanceUpdateHtml } from "@/lib/email/send"
+import { formatCurrency, formatDate } from "@/lib/utils"
+
+export async function GET() {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  try {
+    const data = await db
+      .select()
+      .from(notifications)
+      .where(eq(notifications.user_id, user.id))
+      .orderBy(desc(notifications.sent_at))
+      .limit(50)
+
+    return NextResponse.json(data)
+  } catch (e) {
+    return NextResponse.json({ error: (e as Error).message }, { status: 500 })
+  }
+}
+
+export async function POST(request: Request) {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  const body = await request.json() as {
+    type: string
+    payment_id?: string
+    maintenance_id?: string
+  }
+
+  let result
+
+  if (body.type === "rent_reminder" && body.payment_id) {
+    const payment = await db.query.rent_payments.findFirst({
+      where: and(eq(rent_payments.id, body.payment_id), eq(rent_payments.user_id, user.id)),
+      with: {
+        tenant: { columns: { first_name: true, last_name: true, email: true } },
+        property: { columns: { name: true } },
+        unit: { columns: { unit_number: true } },
+      },
+    })
+
+    if (!payment?.tenant?.email) {
+      return NextResponse.json({ error: "Tenant has no email" }, { status: 400 })
+    }
+
+    result = await sendEmail({
+      to: payment.tenant.email,
+      subject: `Rent Due Reminder — ${payment.property.name}`,
+      html: rentDueReminderHtml({
+        tenantName: `${payment.tenant.first_name} ${payment.tenant.last_name}`,
+        propertyName: payment.property.name,
+        unitNumber: payment.unit?.unit_number ?? "—",
+        amount: formatCurrency(payment.amount),
+        dueDate: formatDate(payment.due_date),
+      }),
+    })
+
+    if (result.success) {
+      await db.insert(notifications).values({
+        user_id: user.id,
+        type: "rent_reminder",
+        recipient_email: payment.tenant.email,
+        subject: `Rent Due Reminder — ${payment.property.name}`,
+        status: "sent",
+        metadata: { payment_id: body.payment_id },
+      })
+    }
+  }
+
+  if (body.type === "maintenance_update" && body.maintenance_id) {
+    const req = await db.query.maintenance_requests.findFirst({
+      where: and(eq(maintenance_requests.id, body.maintenance_id), eq(maintenance_requests.user_id, user.id)),
+      with: {
+        tenant: { columns: { first_name: true, last_name: true, email: true } },
+      },
+    })
+
+    if (!req?.tenant?.email) {
+      return NextResponse.json({ error: "Tenant has no email" }, { status: 400 })
+    }
+
+    result = await sendEmail({
+      to: req.tenant.email,
+      subject: `Maintenance Update — ${req.title}`,
+      html: maintenanceUpdateHtml({
+        tenantName: `${req.tenant.first_name} ${req.tenant.last_name}`,
+        title: req.title,
+        status: req.status,
+        resolutionNotes: req.resolution_notes ?? undefined,
+      }),
+    })
+  }
+
+  return NextResponse.json({ success: true })
+}