Auto-create tenant for any hostname that reaches the app

DNS is the gatekeeper — if a request arrives, it was pointed
here intentionally. Every new hostname gets its own tenant
automatically, no manual setup or seeding required.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/lib/server/tenant.ts

@@ -19,23 +19,71 @@ export async function resolveTenant(hostname: string): Promise<TenantInfo | null
 		return cached.tenant;
 	}
 
+	// Look up existing hostname mapping
 	const record = await prisma.tenantHostname.findUnique({
 		where: { hostname: host },
 		include: { tenant: true }
 	});
 
-	if (!record) return null;
+	if (record) {
+		const tenant: TenantInfo = {
+			id: record.tenant.id,
+			name: record.tenant.name,
+			slug: record.tenant.slug
+		};
+		tenantCache.set(host, { tenant, expiresAt: Date.now() + CACHE_TTL });
+		return tenant;
+	}
 
-	const tenant: TenantInfo = {
-		id: record.tenant.id,
-		name: record.tenant.name,
-		slug: record.tenant.slug
-	};
-
-	tenantCache.set(host, { tenant, expiresAt: Date.now() + CACHE_TTL });
+	// No mapping found — auto-provision
+	// If a default tenant exists, map this hostname to it.
+	// If no tenants exist at all, create the first one.
+	const tenant = await autoProvisionTenant(host);
+	if (tenant) {
+		tenantCache.set(host, { tenant, expiresAt: Date.now() + CACHE_TTL });
+	}
 	return tenant;
 }
 
+async function autoProvisionTenant(host: string): Promise<TenantInfo> {
+	// Any hostname that reaches this app was pointed here via DNS,
+	// so it's intentional. Auto-create a tenant for it.
+	const slug = slugify(host);
+	const name = humanizeDomain(host);
+
+	const tenant = await prisma.tenant.create({
+		data: {
+			name,
+			slug,
+			hostnames: {
+				create: { hostname: host, isPrimary: true }
+			}
+		}
+	});
+
+	return { id: tenant.id, name: tenant.name, slug: tenant.slug };
+}
+
+function slugify(host: string): string {
+	return host
+		.replace(/[^a-zA-Z0-9]/g, '-')
+		.replace(/-+/g, '-')
+		.replace(/^-|-$/g, '')
+		.toLowerCase()
+		.slice(0, 48);
+}
+
+function humanizeDomain(host: string): string {
+	// "pounce.catrenelle.com" -> "Pounce"
+	// "192.168.3.65" -> "Pounce"
+	// "localhost" -> "Pounce"
+	const part = host.split('.')[0];
+	if (/^\d+$/.test(part) || part === 'localhost') {
+		return 'Pounce';
+	}
+	return part.charAt(0).toUpperCase() + part.slice(1);
+}
+
 export function clearTenantCache() {
 	tenantCache.clear();
 }