Consolidate audit-fixes branch: webhooks, integrations, and deploy hardening

Batch commit of the pending working tree on security/audit-fixes-2026-07.
Major areas:
- Outbound webhooks / Zapier: schema + signed delivery with retries, public
  v1 API (REST-hook subscribe/unsubscribe), settings UI, cron drain.
- Deploy hardening: email via SMTP2GO (Resend fully removed), verified DB TLS
  (DATABASE_SSL=require + DATABASE_CA), storage fails loud in production when
  Spaces is unconfigured instead of silently using ephemeral disk.
- Integrations & features (concurrent work): accounting (QuickBooks/Xero),
  e-signature (DocuSign/Dropbox Sign), PayPal, geocoding/maps, onboarding,
  expanded legal pages.
- DB migrations 0006–0009.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

app/api/v1/webhooks/[id]/route.ts

@@ -0,0 +1,106 @@
+import { NextResponse } from "next/server"
+import { and, eq } from "drizzle-orm"
+import { db } from "@/lib/db"
+import { webhook_endpoints } from "@/lib/db/schema"
+import { resolveApiRequest } from "@/lib/api-auth"
+import { webhookEndpointSchema } from "@/lib/validations"
+import { isWebhookEvent } from "@/lib/webhooks/events"
+import { assertSafeWebhookUrl, WebhookUrlError } from "@/lib/webhooks/ssrf"
+
+// Public REST API (v1) — read/update/delete a single webhook subscription.
+// DELETE is what Zapier's REST-hook unsubscribe calls. Owner-scoped by id.
+
+const unauthorized = () =>
+  NextResponse.json({ error: { code: 401, message: "Unauthorized" } }, { status: 401 })
+const forbidden = () =>
+  NextResponse.json({ error: { code: 403, message: "Forbidden" } }, { status: 403 })
+const notFound = () =>
+  NextResponse.json({ error: { code: 404, message: "Not found" } }, { status: 404 })
+
+// Fields returned to API consumers (never the signing secret).
+const RETURN_COLUMNS = {
+  id: webhook_endpoints.id,
+  url: webhook_endpoints.url,
+  description: webhook_endpoints.description,
+  events: webhook_endpoints.events,
+  status: webhook_endpoints.status,
+  source: webhook_endpoints.source,
+  created_at: webhook_endpoints.created_at,
+}
+
+export async function GET(request: Request, { params }: { params: Promise<{ id: string }> }) {
+  const ctx = await resolveApiRequest(request)
+  if (!ctx) return unauthorized()
+
+  const { id } = await params
+  const data = await db.query.webhook_endpoints.findFirst({
+    where: and(eq(webhook_endpoints.id, id), eq(webhook_endpoints.user_id, ctx.ownerId)),
+    columns: { secret: false },
+  })
+  if (!data) return notFound()
+  return NextResponse.json({ data })
+}
+
+export async function PATCH(request: Request, { params }: { params: Promise<{ id: string }> }) {
+  const ctx = await resolveApiRequest(request)
+  if (!ctx) return unauthorized()
+  if (!ctx.canWrite) return forbidden()
+
+  const { id } = await params
+  const body = (await request.json().catch(() => null)) as Record<string, unknown> | null
+
+  const parsed = webhookEndpointSchema.partial().safeParse(body ?? {})
+  if (!parsed.success) {
+    return NextResponse.json(
+      { error: { code: 400, message: parsed.error.flatten() } },
+      { status: 400 }
+    )
+  }
+
+  const patch: Partial<typeof webhook_endpoints.$inferInsert> = {}
+  if (parsed.data.url !== undefined) {
+    try {
+      await assertSafeWebhookUrl(parsed.data.url)
+    } catch (e) {
+      return NextResponse.json(
+        {
+          error: {
+            code: 400,
+            message: e instanceof WebhookUrlError ? e.message : "Invalid webhook URL",
+          },
+        },
+        { status: 400 }
+      )
+    }
+    patch.url = parsed.data.url
+  }
+  if (parsed.data.events !== undefined) {
+    patch.events = Array.from(new Set(parsed.data.events.filter(isWebhookEvent)))
+  }
+  if (parsed.data.description !== undefined) patch.description = parsed.data.description || null
+  if (body?.status === "active" || body?.status === "disabled") patch.status = body.status
+
+  const [data] = await db
+    .update(webhook_endpoints)
+    .set(patch)
+    .where(and(eq(webhook_endpoints.id, id), eq(webhook_endpoints.user_id, ctx.ownerId)))
+    .returning(RETURN_COLUMNS)
+
+  if (!data) return notFound()
+  return NextResponse.json({ data })
+}
+
+export async function DELETE(request: Request, { params }: { params: Promise<{ id: string }> }) {
+  const ctx = await resolveApiRequest(request)
+  if (!ctx) return unauthorized()
+  if (!ctx.canWrite) return forbidden()
+
+  const { id } = await params
+  const [deleted] = await db
+    .delete(webhook_endpoints)
+    .where(and(eq(webhook_endpoints.id, id), eq(webhook_endpoints.user_id, ctx.ownerId)))
+    .returning({ id: webhook_endpoints.id })
+
+  if (!deleted) return notFound()
+  return NextResponse.json({ data: { id: deleted.id, deleted: true } })
+}