Add multi-domain routing: middleware, Redis caching, dynamic renderers

- Migration: Add route column + performance indexes for <5ms lookups
- Redis cache layer with graceful degradation
- Middleware: Route custom domains to database pages
- Page/Post renderers with full SEO metadata
- Support for 12-section content fragments
- Site-specific styling from config.custom_css

Enables: aesthetichelp.com -> database pages
Performance: <5ms routing with Redis caching

migrations/05_add_multi_domain_routing.sql

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+-- Migration: Add routing columns and performance indexes
+-- This enables multi-domain routing with <5ms lookup performance
+
+-- Add route column and SEO fields to pages
+ALTER TABLE pages
+ADD COLUMN IF NOT EXISTS route VARCHAR(512),
+ADD COLUMN IF NOT EXISTS status VARCHAR(50) DEFAULT 'draft',
+ADD COLUMN IF NOT EXISTS meta_title VARCHAR(255),
+ADD COLUMN IF NOT EXISTS meta_description VARCHAR(512),
+ADD COLUMN IF NOT EXISTS seo_data JSONB DEFAULT '{}',
+ADD COLUMN IF NOT EXISTS published_at TIMESTAMPTZ;
+
+-- Migrate existing slugs to routes
+UPDATE pages SET route = '/' || slug WHERE route IS NULL;
+
+-- Make route required
+ALTER TABLE pages ALTER COLUMN route SET NOT NULL;
+
+-- ⚡ CRITICAL: Performance indexes for <5ms routing
+CREATE INDEX IF NOT EXISTS idx_pages_site_route ON pages (site_id, route);
+
+CREATE INDEX IF NOT EXISTS idx_sites_domain_active ON sites (domain)
+WHERE
+    status = 'active';
+
+-- Unique constraint per site
+ALTER TABLE pages
+ADD CONSTRAINT unique_site_route UNIQUE (site_id, route);
+
+-- Add status index for published pages
+CREATE INDEX IF NOT EXISTS idx_pages_status ON pages (status)
+WHERE
+    status = 'published';
+
+-- Add route index
+CREATE INDEX IF NOT EXISTS idx_pages_route ON pages (route);
+
+-- Same SEO fields for posts
+ALTER TABLE posts
+ADD COLUMN IF NOT EXISTS seo_data JSONB DEFAULT '{}';
+
+-- Performance index for posts
+CREATE INDEX IF NOT EXISTS idx_posts_site_slug ON posts (site_id, slug);
+
+CREATE INDEX IF NOT EXISTS idx_posts_status ON posts (status)
+WHERE
+    status = 'published';
+
+-- Success message
+DO $$ BEGIN RAISE NOTICE '✅ Multi-domain routing migration complete - Indexes created for <5ms performance';
+
+END $$;

src/lib/cache/redis.ts

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+/**
+ * Redis Cache Helper
+ * 
+ * Provides caching layer for site/page lookups to achieve <5ms routing.
+ * Gracefully degrades if Redis is unavailable.
+ */
+import Redis from 'ioredis';
+
+let redis: Redis | null = null;
+
+export function getRedisClient(): Redis {
+    if (!redis) {
+        const redisUrl = process.env.REDIS_URL || 'redis://localhost:6379';
+        redis = new Redis(redisUrl, {
+            maxRetriesPerRequest: 3,
+            retryStrategy(times) {
+                const delay = Math.min(times * 50, 2000);
+                return delay;
+            },
+            lazyConnect: true,
+            enableReadyCheck: true,
+            // Timeout to prevent hanging
+            connectTimeout: 1000,
+            commandTimeout: 2000
+        });
+
+        // Handle errors gracefully
+        redis.on('error', (err) => {
+            console.warn('Redis error:', err.message);
+        });
+    }
+    return redis;
+}
+
+/**
+ * Cache wrapper for site/page lookups
+ * Falls back to direct DB query if Redis unavailable
+ * 
+ * @param key - Cache key
+ * @param fetchFn - Function to fetch data if cache miss
+ * @param ttl - Time to live in seconds (default: 60s)
+ */
+export async function getCached<T>(
+    key: string,
+    fetchFn: () => Promise<T>,
+    ttl: number = 60
+): Promise<T> {
+    try {
+        const redis = getRedisClient();
+
+        // Ensure connection
+        if (redis.status !== 'ready') {
+            await redis.connect().catch(() => null);
+        }
+
+        // Try cache first
+        const cached = await redis.get(key);
+        if (cached) {
+            return JSON.parse(cached);
+        }
+    } catch (err) {
+        // Redis unavailable - fall through to DB
+        if (process.env.NODE_ENV === 'development') {
+            console.warn('Redis cache miss, using DB:', key);
+        }
+    }
+
+    // Cache miss or Redis unavailable - fetch from DB
+    const data = await fetchFn();
+
+    // Store in cache (fire and forget - don't block on cache writes)
+    if (data !== null && data !== undefined) {
+        try {
+            const redis = getRedisClient();
+            redis.setex(key, ttl, JSON.stringify(data)).catch(() => {
+                // Ignore cache write failures
+            });
+        } catch (err) {
+            // Cache write failure is non-fatal
+        }
+    }
+
+    return data;
+}
+
+/**
+ * Invalidate all cache entries for a site
+ * Use this when pages are updated/deleted
+ * 
+ * @param domain - Site domain to invalidate
+ */
+export async function invalidateSite(domain: string) {
+    try {
+        const redis = getRedisClient();
+        const pattern = `site:${domain}:*`;
+
+        // Find all keys matching pattern
+        const keys = await redis.keys(pattern);
+
+        if (keys.length > 0) {
+            await redis.del(...keys);
+            console.log(`Cache invalidated: ${keys.length} keys for ${domain}`);
+        }
+    } catch (err) {
+        console.warn('Cache invalidation failed:', err);
+        // Non-fatal - cache will expire naturally
+    }
+}
+
+/**
+ * Invalidate a specific page cache
+ * 
+ * @param domain - Site domain
+ * @param route - Page route (e.g., "/about")
+ */
+export async function invalidatePage(domain: string, route: string) {
+    try {
+        const redis = getRedisClient();
+        const key = `site:${domain}:page:${route}`;
+        await redis.del(key);
+    } catch (err) {
+        console.warn('Page cache invalidation failed:', err);
+    }
+}
+
+/**
+ * Get cache statistics
+ */
+export async function getCacheStats() {
+    try {
+        const redis = getRedisClient();
+        const info = await redis.info('stats');
+        const lines = info.split('\r\n');
+        const stats: Record<string, string> = {};
+
+        lines.forEach(line => {
+            const [key, value] = line.split(':');
+            if (key && value) {
+                stats[key] = value;
+            }
+        });
+
+        return {
+            hits: parseInt(stats.keyspace_hits || '0'),
+            misses: parseInt(stats.keyspace_misses || '0'),
+            hitRate: stats.keyspace_hits && stats.keyspace_misses
+                ? (parseInt(stats.keyspace_hits) / (parseInt(stats.keyspace_hits) + parseInt(stats.keyspace_misses)) * 100).toFixed(2) + '%'
+                : 'N/A'
+        };
+    } catch (err) {
+        return { hits: 0, misses: 0, hitRate: 'Redis unavailable' };
+    }
+}

src/middleware.ts

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+/**
+ * Multi-Domain Routing Middleware
+ * 
+ * Routes custom domains (aesthetichelp.com) to pages from database.
+ * Uses Redis caching for <5ms performance.
+ * 
+ * Flow:
+ * 1. Extract domain from Host header
+ * 2. Lookup site by domain (Redis cached)
+ * 3. Lookup page by route (Redis cached)
+ * 4. Rewrite to dynamic renderer
+ */
+import { defineMiddleware } from 'astro:middleware';
+import { pool } from '@/lib/db';
+import { getCached } from '@/lib/cache/redis';
+
+export const onRequest = defineMiddleware(async (context, next) => {
+    const host = context.request.headers.get('host')?.split(':')[0].replace(/^www\./, '') || '';
+    const pathname = context.url.pathname;
+
+    // Skip static assets, admin, API routes
+    if (
+        pathname.startsWith('/admin') ||
+        pathname.startsWith('/api') ||
+        pathname.startsWith('/shim') ||
+        pathname.startsWith('/preview') ||
+        pathname.startsWith('/render') ||
+        pathname.match(/\.(ico|png|jpg|jpeg|svg|css|js|woff|woff2|map|html|webp|gif|pdf)$/)
+    ) {
+        return next();
+    }
+
+    // Platform domain - allow default routing
+    const platformDomain = import.meta.env.PUBLIC_PLATFORM_DOMAIN || 'spark.jumpstartscaling.com';
+    if (host.includes(platformDomain) || host === 'localhost' || host === '127.0.0.1') {
+        return next();
+    }
+
+    try {
+        // ⚡ REDIS-CACHED SITE LOOKUP (5 min cache)
+        const site = await getCached(
+            `site:${host}:meta`,
+            async () => {
+                const { rows } = await pool.query(
+                    'SELECT id, name, domain, status, config FROM sites WHERE domain = $1',
+                    [host]
+                );
+                return rows[0] || null;
+            },
+            300 // 5 min cache
+        );
+
+        if (!site) {
+            return new Response(`
+                <!DOCTYPE html>
+                <html>
+                <head><title>Site Not Found</title></head>
+                <body style="font-family: system-ui; text-align: center; padding: 100px 20px;">
+                    <h1>🔍 Site Not Found</h1>
+                    <p>The domain <strong>${host}</strong> is not configured.</p>
+                    <p style="color: #666; font-size: 14px;">
+                        Please contact support if you believe this is an error.
+                    </p>
+                </body>
+                </html>
+            `, {
+                status: 404,
+                headers: { 'Content-Type': 'text/html' }
+            });
+        }
+
+        if (site.status !== 'active') {
+            return new Response(`
+                <!DOCTYPE html>
+                <html>
+                <head><title>Site Maintenance</title></head>
+                <body style="font-family: system-ui; text-align: center; padding: 100px 20px;">
+                    <h1>🚧 Site Under Maintenance</h1>
+                    <p>We'll be back soon!</p>
+                </body>
+                </html>
+            `, {
+                status: 503,
+                headers: { 'Content-Type': 'text/html' }
+            });
+        }
+
+        // Inject site data into context
+        context.locals.site = site;
+        context.locals.siteId = site.id;
+
+        // ⚡ REDIS-CACHED PAGE LOOKUP (1 min cache)
+        const page = await getCached(
+            `site:${host}:page:${pathname}`,
+            async () => {
+                const { rows } = await pool.query(
+                    `SELECT * FROM pages 
+                     WHERE site_id = $1 AND route = $2 AND status = 'published'
+                     LIMIT 1`,
+                    [site.id, pathname]
+                );
+                return rows[0] || null;
+            },
+            60 // 1 min cache
+        );
+
+        if (page) {
+            context.locals.page = page;
+            return context.rewrite('/render/page');
+        }
+
+        // Check for blog post (route: /blog/post-slug)
+        if (pathname.startsWith('/blog/')) {
+            const slug = pathname.replace('/blog/', '');
+
+            const post = await getCached(
+                `site:${host}:post:${slug}`,
+                async () => {
+                    const { rows } = await pool.query(
+                        `SELECT * FROM posts 
+                         WHERE site_id = $1 AND slug = $2 AND status = 'published'
+                         LIMIT 1`,
+                        [site.id, slug]
+                    );
+                    return rows[0] || null;
+                },
+                60
+            );
+
+            if (post) {
+                context.locals.post = post;
+                return context.rewrite('/render/post');
+            }
+        }
+
+        // 404 - check for custom 404 page
+        const notFoundPage = await getCached(
+            `site:${host}:page:/404`,
+            async () => {
+                const { rows } = await pool.query(
+                    `SELECT * FROM pages 
+                     WHERE site_id = $1 AND route = '/404'
+                     LIMIT 1`,
+                    [site.id]
+                );
+                return rows[0] || null;
+            },
+            300
+        );
+
+        if (notFoundPage) {
+            context.locals.page = notFoundPage;
+            return context.rewrite('/render/page');
+        }
+
+        // Default 404
+        return new Response(`
+            <!DOCTYPE html>
+            <html>
+            <head><title>Page Not Found</title></head>
+            <body style="font-family: system-ui; text-align: center; padding: 100px 20px;">
+                <h1>404 - Page Not Found</h1>
+                <p>The page <strong>${pathname}</strong> doesn't exist.</p>
+                <a href="/" style="color: #667eea;">← Back to Home</a>
+            </body>
+            </html>
+        `, {
+            status: 404,
+            headers: { 'Content-Type': 'text/html' }
+        });
+
+    } catch (err) {
+        console.error('Middleware error:', err);
+        return new Response('Internal Server Error', { status: 500 });
+    }
+});

src/pages/render/page.astro

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+---
+/**
+ * Dynamic Page Renderer
+ * 
+ * Renders pages from database with full SEO metadata.
+ * Supports 12-section content fragments and site-specific styling.
+ */
+const { site, page } = Astro.locals;
+
+if (!page || !site) {
+  return new Response('Not found', { status: 404 });
+}
+
+// Extract SEO data from JSONB
+const seoData = page.seo_data || {};
+const title = page.meta_title || page.title;
+const description = page.meta_description || '';
+const ogImage = seoData.og_image || '';
+const keywords = seoData.keywords || [];
+const canonicalUrl = Astro.url.href;
+
+// Site configuration
+const siteConfig = site.config || {};
+---
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  
+  <!-- Primary Meta Tags -->
+  <title>{title}</title>
+  <meta name="description" content={description}>
+  {keywords.length > 0 && <meta name="keywords" content={keywords.join(', ')}>}
+  
+  <!-- Canonical URL -->
+  <link rel="canonical" href={canonicalUrl}>
+  
+  <!-- Open Graph / Facebook -->
+  <meta property="og:type" content="website">
+  <meta property="og:url" content={canonicalUrl}>
+  <meta property="og:title" content={title}>
+  <meta property="og:description" content={description}>
+  <meta property="og:site_name" content={site.name}>
+  {ogImage && (
+    <>
+      <meta property="og:image" content={ogImage}>
+      <meta property="og:image:width" content="1200">
+      <meta property="og:image:height" content="630">
+    </>
+  )}
+  
+  <!-- Twitter -->
+  <meta property="twitter:card" content="summary_large_image">
+  <meta property="twitter:url" content={canonicalUrl}>
+  <meta property="twitter:title" content={title}>
+  <meta property="twitter:description" content={description}>
+  {ogImage && <meta property="twitter:image" content={ogImage}>}
+  
+  <!-- JSON-LD Schema (if provided in seo_data) -->
+  {seoData.schema && (
+    <script type="application/ld+json" set:html={JSON.stringify(seoData.schema)} />
+  )}
+  
+  <!-- Site-specific custom CSS from config.custom_css -->
+  {siteConfig.custom_css && (
+    <style set:html={siteConfig.custom_css} />
+  )}
+  
+  <!-- Default styling -->
+  <style>
+    * {
+      margin: 0;
+      padding: 0;
+      box-sizing: border-box;
+    }
+    
+    body {
+     font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
+      max-width: 800px;
+      margin: 0 auto;
+      padding: 40px 20px;
+      line-height: 1.7;
+      color: #1a1a1a;
+      background: #ffffff;
+    }
+    
+    h1, h2, h3, h4, h5, h6 {
+      line-height: 1.3;
+      margin-top: 2rem;
+      margin-bottom: 1rem;
+      font-weight: 700;
+    }
+    
+    h1 { font-size: 2.5rem; }
+    h2 { font-size: 1.875rem; }
+    h3 { font-size: 1.5rem; }
+    
+    p {
+      margin-bottom: 1.5rem;
+    }
+    
+    a {
+      color: #667eea;
+      text-decoration: none;
+      transition: color 0.2s;
+    }
+    
+    a:hover {
+      color: #764ba2;
+      text-decoration: underline;
+    }
+    
+    img {
+      max-width: 100%;
+      height: auto;
+      border-radius: 8px;
+    }
+    
+    ul, ol {
+      margin-left: 2rem;
+      margin-bottom: 1.5rem;
+    }
+    
+    li {
+      margin-bottom: 0.5rem;
+    }
+    
+    code {
+      background: #f4f4f4;
+      padding: 2px 6px;
+      border-radius: 3px;
+      font-family: 'Courier New', monospace;
+    }
+    
+    pre {
+      background: #f4f4f4;
+      padding: 1rem;
+      border-radius: 6px;
+      overflow-x: auto;
+      margin-bottom: 1.5rem;
+    }
+    
+    blockquote {
+      border-left: 4px solid #667eea;
+      padding-left: 1rem;
+      margin: 1.5rem 0;
+      font-style: italic;
+      color: #666;
+    }
+    
+    table {
+      width: 100%;
+      border-collapse: collapse;
+      margin: 1.5rem 0;
+    }
+    
+    th, td {
+      border: 1px solid #ddd;
+      padding: 12px;
+      text-align: left;
+    }
+    
+    th {
+      background: #f8f9fa;
+      font-weight: 600;
+    }
+  </style>
+</head>
+<body>
+  <!-- Site header from config (optional) -->
+  {siteConfig.header && (
+    <header>
+      <Fragment set:html={siteConfig.header} />
+    </header>
+  )}
+  
+  <!-- Main content - supports 12-section fragments -->
+  <main>
+    <Fragment set:html={page.content} />
+  </main>
+  
+  <!-- Site footer from config (optional) -->
+  {siteConfig.footer && (
+    <footer>
+      <Fragment set:html={siteConfig.footer} />
+    </footer>
+  )}
+</body>
+</html>

src/pages/render/post.astro

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+---
+/**
+ * Dynamic Post Renderer
+ * 
+ * Renders blog posts from database with article schema.
+ */
+const { site, post } = Astro.locals;
+
+if (!post || !site) {
+  return new Response('Not found', { status: 404 });
+}
+
+// Extract SEO data
+const seoData = post.seo_data || {};
+const title = post.meta_title || post.title;
+const description = post.meta_description || post.excerpt || '';
+const ogImage = seoData.og_image || '';
+const publishedDate = post.published_at ? new Date(post.published_at).toISOString() : new Date().toISOString();
+const canonicalUrl = Astro.url.href;
+
+// Site configuration
+const siteConfig = site.config || {};
+---
+
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="UTF-8">
+  <meta name="viewport" content="width=device-width, initial-scale=1.0">
+  
+  <!-- Primary Meta Tags -->
+  <title>{title}</title>
+  <meta name="description" content={description}>
+  
+  <!-- Canonical URL -->
+  <link rel="canonical" href={canonicalUrl}>
+  
+  <!-- Open Graph / Facebook -->
+  <meta property="og:type" content="article">
+  <meta property="og:url" content={canonicalUrl}>
+  <meta property="og:title" content={title}>
+  <meta property="og:description" content={description}>
+  <meta property="og:site_name" content={site.name}>
+  <meta property="article:published_time" content={publishedDate}>
+  {ogImage && (
+    <>
+      <meta property="og:image" content={ogImage}>
+      <meta property="og:image:width" content="1200">
+      <meta property="og:image:height" content="630">
+    </>
+  )}
+  
+  <!-- Twitter -->
+  <meta property="twitter:card" content="summary_large_image">
+  <meta property="twitter:url" content={canonicalUrl}>
+  <meta property="twitter:title" content={title}>
+  <meta property="twitter:description" content={description}>
+  {ogImage && <meta property="twitter:image" content={ogImage}>}
+  
+  <!-- Article JSON-LD Schema -->
+  <script type="application/ld+json" set:html={JSON.stringify({
+    "@context": "https://schema.org",
+    "@type": "Article",
+    "headline": title,
+    "description": description,
+    "image": ogImage || undefined,
+    "datePublished": publishedDate,
+    "author": {
+      "@type": "Organization",
+      "name": site.name
+    },
+    "publisher": {
+      "@type": "Organization",
+      "name": site.name
+    },
+    "mainEntityOfPage": {
+      "@type": "WebPage",
+      "@id": canonicalUrl
+    }
+  })} />
+  
+  <!-- Site-specific custom CSS -->
+  {siteConfig.custom_css && (
+    <style set:html={siteConfig.custom_css} />
+  )}
+  
+  <!-- Default post styling -->
+  <style>
+    * {
+      margin: 0;
+      padding: 0;
+      box-sizing: border-box;
+    }
+    
+    body {
+      font-family: system-ui, -apple-system, sans-serif;
+      max-width: 700px;
+      margin: 0 auto;
+      padding: 60px 20px;
+      line-height: 1.7;
+      color: #1a1a1a;
+    }
+    
+    article header {
+      margin-bottom: 3rem;
+      padding-bottom: 2rem;
+      border-bottom: 2px solid #f0f0f0;
+    }
+    
+    article h1 {
+      font-size: 2.75rem;
+      font-weight: 800;
+      margin-bottom: 1rem;
+      line-height: 1.2;
+    }
+    
+    .post-meta {
+      color: #666;
+      font-size: 0.875rem;
+      margin-top: 1rem;
+    }
+    
+    article h2 {
+      font-size: 1.875rem;
+      margin-top: 2.5rem;
+      margin-bottom: 1rem;
+    }
+    
+    article h3 {
+      font-size: 1.5rem;
+      margin-top: 2rem;
+      margin-bottom: 0.75rem;
+    }
+    
+    article p {
+      margin-bottom: 1.5rem;
+      font-size: 1.125rem;
+    }
+    
+    article a {
+      color: #667eea;
+      text-decoration: none;
+    }
+    
+    article a:hover {
+      color: #764ba2;
+      text-decoration: underline;
+    }
+    
+    article img {
+      max-width: 100%;
+      height: auto;
+      border-radius: 8px;
+      margin: 2rem 0;
+    }
+    
+    article ul, article ol {
+      margin-left: 2rem;
+      margin-bottom: 1.5rem;
+    }
+    
+    article li {
+      margin-bottom: 0.75rem;
+      font-size: 1.125rem;
+    }
+  </style>
+</head>
+<body>
+  {siteConfig.header && (
+    <header>
+      <Fragment set:html={siteConfig.header} />
+    </header>
+  )}
+  
+  <article>
+    <header>
+      <h1>{post.title}</h1>
+      <div class="post-meta">
+        Published {new Date(publishedDate).toLocaleDateString('en-US', { 
+          year: 'numeric', 
+          month: 'long', 
+          day: 'numeric' 
+        })}
+      </div>
+    </header>
+    
+    <Fragment set:html={post.content} />
+  </article>
+  
+  {siteConfig.footer && (
+    <footer>
+      <Fragment set:html={siteConfig.footer} />
+    </footer>
+  )}
+</body>
+</html>