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/rent/generate/route.ts

@@ -0,0 +1,63 @@
+import { NextResponse } from "next/server"
+import { and, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { leases, rent_payments } from "@/lib/db/schema"
+import { getSessionUser } from "@/lib/session"
+
+export async function POST(request: Request) {
+  const user = await getSessionUser()
+  if (!user) return NextResponse.json({ error: "Unauthorized" }, { status: 401 })
+
+  const { year, month } = await request.json() as { year: number; month: number }
+  if (!year || month === undefined) return NextResponse.json({ error: "year and month required" }, { status: 400 })
+
+  // Get all active leases with rent amount
+  const activeLeases = await db
+    .select({
+      id: leases.id,
+      tenant_id: leases.tenant_id,
+      property_id: leases.property_id,
+      unit_id: leases.unit_id,
+      rent_amount: leases.rent_amount,
+    })
+    .from(leases)
+    .where(and(eq(leases.user_id, user.id), eq(leases.status, "active")))
+
+  if (!activeLeases.length) return NextResponse.json({ created: 0, skipped: 0 })
+
+  // Build due date: first of selected month
+  const pad = (n: number) => String(n).padStart(2, "0")
+  const due_date = `${year}-${pad(month + 1)}-01`
+
+  // Check which already exist for this month
+  const existing = await db
+    .select({ tenant_id: rent_payments.tenant_id })
+    .from(rent_payments)
+    .where(and(eq(rent_payments.user_id, user.id), eq(rent_payments.due_date, due_date)))
+
+  const existingTenantIds = new Set(existing.map((p) => p.tenant_id))
+
+  const toInsert = activeLeases
+    .filter((l) => !existingTenantIds.has(l.tenant_id))
+    .map((l) => ({
+      user_id:     user.id,
+      tenant_id:   l.tenant_id,
+      property_id: l.property_id,
+      unit_id:     l.unit_id ?? null,
+      amount:      l.rent_amount,
+      due_date,
+      status:      "pending" as const,
+    }))
+
+  if (toInsert.length === 0) {
+    return NextResponse.json({ created: 0, skipped: activeLeases.length, message: "All payments already exist for this month." })
+  }
+
+  await db.insert(rent_payments).values(toInsert)
+
+  return NextResponse.json({
+    created: toInsert.length,
+    skipped: existingTenantIds.size,
+    message: `Created ${toInsert.length} payment${toInsert.length !== 1 ? "s" : ""} for ${due_date.slice(0, 7)}.`,
+  })
+}