Initial certificate system

backend/app/services/rate_limit.py

@@ -0,0 +1,12 @@
+import time
+
+_hits: dict[str, list[float]] = {}
+
+
+def hit_too_often(key: str, limit: int, window_seconds: int) -> bool:
+    now = time.time()
+    start = now - window_seconds
+    recent = [value for value in _hits.get(key, []) if value >= start]
+    recent.append(now)
+    _hits[key] = recent
+    return len(recent) > limit