Update README.md

Author: tstromberg

README.md

@@ -12,12 +12,9 @@ ADVRider's built-in notifications only email you once after your last visit. Thi
 
 Subscribe to any ADVRider thread and get emails when new posts appear.
 
-**Respectful polling:** Adaptive intervals from 5 minutes (active threads) to 4 hours (quiet threads) using exponential backoff: `5min × 2^(hours_since_post / 3)`. Polling cycles are triggered every 10 minutes via Cloud Scheduler, making the real-world minimum check interval ~10 minutes for active threads. Each thread is scraped once per cycle regardless of subscriber count, minimizing server load.
-
+**Respectful polling:** Adaptive intervals from ~10 minutes (active threads) to 4 hours using exponential backoff. Minimum poll time is defined as `5min × 2^(hours_since_post / 3)`, with a 10-minute polling loop; shared fetch for all subscribers to minimize load.
 **User limits:** Maximum 20 threads per email address. Notifications batch up to 10 posts to prevent spam.
-
-**Security:** Rate limited to 5 requests/second per IP. Token-based subscription management. Thread verification before subscription. Email content sanitized to prevent XSS and phishing.
-
+**Security:** Token-based subscription management. mail content sanitized to prevent XSS and phishing.
 **Email quality:** Dark mode support, WCAG AA compliant, clickable post anchors linking directly to specific posts.
 
 ## Running locally
@@ -26,18 +23,7 @@ Subscribe to any ADVRider thread and get emails when new posts appear.
 go run .
 ```
 
-Visit http://localhost:8080 and subscribe to a thread.
-
-## Architecture
-
-```
-/                    Subscribe form
-/subscribe           Create subscription (verifies thread exists)
-/manage?token=...    View/delete subscriptions
-/pollz               Trigger poll (rate limited)
-```
-
-Storage: Local filesystem (`./data`) or GCS. Email via Brevo API (auto-mocks when `BREVO_API_KEY` not set).
+Server will be available at http://localhost:8080
 
 ## License