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Build a self-hosted social proof notification engine for an ecommerce store. 1. DATA MODEL: Create an Event entity with fields: id, platform, event_type (e.g. order_created), customer_first_name, customer_city, customer_country, product_name, product_image_url, product_url, timestamp, created_at. Anonymize names to 'First Name + Last Initial' (e.g. 'John D.'). Create an Impression record with: id, event_id, store_id, display_timestamp, clicked (boolean). 2. CORE FUNCTIONALITY: Build an API endpoint POST /api/webhooks/shopify protected by webhook signature verification. Upon parsing an order, construct an Event record and cache the last 50 events in a Redis list. Create a public CDN-cached GET /api/events endpoint returning JSON array of recent events. Build a lightweight asynchronous client-side JavaScript snippet (under 5KB) that loads on the storefront. The JS script calls GET /api/events, stores items in memory, and renders fixed bottom-left HTML toast popups on a configurable loop (e.g., show for 4 seconds, hide for 6 seconds). Implement local storage tracking to limit a single user from seeing more than 5 popups per session. 3. FAILURE MODES: Handle CORS headers correctly for target store domain. If Redis or DB is unreachable, return HTTP 200 with an empty array to ensure frontend script never blocks store page rendering. If webhook receives incomplete order data, drop record gracefully without throwing unhandled exceptions. 4. OUT OF SCOPE: Third-party integrations beyond Shopify webhooks, complex A/B testing engines, and multi-tenant billing logic. Output production-ready Node.js backend code and vanilla ES6 frontend embed code.

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