Ure093 Jun 2026

// ----- internal helpers ----- _sign(payload) // Simple client‑side HMAC (for demo only – production uses server‑side signing) // In real world, we send payload to a signing service or use AWS SigV4. return ''; // placeholder

# freshness decay (days since publish) age_days = (now - item.published_at).days decay = 0.95 ** age_days return base * decay ure093