chore: update CHANGELOG.md to include multiple performance enhancements, such as faster billing page loading, improved funnel analysis, and more reliable database connections under heavy load

CHANGELOG.md

@@ -8,6 +8,14 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/),
 
 ### Added
 
+- **Faster billing page loading.** Your subscription details now load much quicker when you visit the billing page. Previously, several requests to our payment provider were made one after another, which could add 1-2 seconds to the page load. Now these happen simultaneously, cutting the wait time significantly. If any request takes too long, we gracefully continue so you always see your billing information without frustrating delays.
+- **Faster funnel analysis for multi-step conversions.** We've significantly improved how conversion funnels are calculated. Instead of scanning your data multiple times for each step in a funnel, we now do it in a single efficient pass. This means complex funnels with multiple steps load almost instantly instead of taking seconds—or even timing out. We've also added a reasonable limit of 5 steps per funnel to ensure optimal performance.
+- **More reliable database connections under heavy load.** We've optimized how Pulse manages its database connections to handle much higher traffic without issues. By increasing the connection pool size and improving how connections are reused, your dashboard stays responsive even when thousands of users are viewing analytics simultaneously. We also added better monitoring so we can detect and address connection issues before they affect you.
+- **Better support for growing teams and traffic.** We've added infrastructure improvements that allow Pulse to run smoothly across multiple servers. When you scale up to handle more traffic, our background processes—like daily analytics calculations and data cleanup—will coordinate automatically so they don't conflict with each other. This ensures reliable performance as your team and data grow.
+- **Smarter protection for heavy dashboard operations.** We've implemented a new tiered rate limiting system that treats complex dashboard queries differently from simple requests. Expensive operations—like loading your full dashboard with all its charts and data—now have their own dedicated limits to prevent anyone from accidentally overwhelming the system with too many rapid refreshes. This keeps everything running smoothly for everyone, especially during busy periods.
+- **Smarter caching for faster dashboard loading.** We've added intelligent caching headers to our API responses, so your browser can remember recently loaded data and show it instantly when you navigate between pages. This works alongside our existing server-side caching to make your dashboard feel even more responsive—especially when switching between different date ranges or sections.
+- **More flexible uptime monitoring.** We've made our uptime checker more adaptable to different needs. Instead of a fixed limit on how many websites we can check simultaneously, you can now configure this based on your requirements. This means faster uptime checks for busy sites with many monitors, while keeping things efficient for smaller setups.
+- **Smarter data cleanup for better performance.** We've improved how old analytics data is cleaned up to keep everything running smoothly. Instead of deleting large amounts of data all at once—which could slow things down—we now remove old data in small, efficient batches. This ensures your dashboard stays fast and responsive even as we clean up months of historical data behind the scenes.
 - **Faster analytics processing for all sites.** We've upgraded how your daily analytics are calculated behind the scenes. Instead of processing sites one by one, we now analyze multiple sites simultaneously using a smart parallel system. This means your daily stats—like visitor counts and page views—are updated more quickly and consistently, even as we handle data from thousands of websites.
 - **Lighter dashboard data transfers.** Your dashboard now loads data in smaller, focused pieces instead of one massive bundle. This means faster loading times—especially on slower connections—and your analytics appear section by section as they become ready, rather than making you wait for everything at once.
 - **Smarter data fetching.** Your dashboard now automatically prevents duplicate requests when multiple components ask for the same data at the same time. It also briefly caches recent responses, so switching between pages feels instant while still keeping everything up to date. This reduces server load and makes the app feel snappier.