Can I vibe code SiteSpect?

1. System Overview: Build a lightweight server-side A/B testing platform leveraging Cloudflare Workers for low-latency experiment assignment and variant response modification.

2. Data Model: Define entities in PostgreSQL using Prisma:
- Experiment: id, name, key, status (draft, active, paused), trafficAllocation (0-100), metrics (JSON array of goal events).
- Variant: id, experimentId, key, weight (percentage), isControl (boolean), domMutations (JSON array containing CSS selector, action type, payload).
- UserAssignment: id, userId, anonymousId, experimentId, variantId, assignedAt.
- ExperimentEvent: id, experimentId, variantId, eventName, value, timestamp, metadata.

3. Core Functionality:
- Edge Worker Evaluation: Inspect inbound request for an 'exp_id' cookie. If missing, generate a deterministic hash of anonymousId + experimentKey to assign variant based on traffic weight. Set persistent response cookie.
- Response Modification: If assigned to a non-control variant, use HTMLRewriter inside the Cloudflare Worker to execute DOM mutations (replace text, prepend/append HTML, alter CSS attributes) streaming through without full buffer latency.
- Analytics Ingestion: Async non-blocking dispatch of exposure and conversion events to a ClickHouse or Postgres queue via HTTP endpoint.
- Statistical Engine: Compute frequentist z-score, p-value, and 95% confidence intervals for conversion rates between control and variants on demand in the admin dashboard.

4. Failure Modes & Edge Cases:
- Edge Timeout: If worker execution exceeds 10ms, fail open and return original unmodified HTML response.
- Bot Traffic: Ignore requests matching common crawler user-agents from assignment logging to prevent skewed stats.
- Concurrent Experiments: Handle overlapping tests by maintaining a state array in cookie to avoid conflicting DOM rewriting.

5. Out of Scope:
- Visual drag-and-drop WYSIWYG editor.
- Native mobile app SDKs (focus strictly on web/HTTP stream processing).
- Multi-armed bandit dynamic real-time traffic balancing.

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