Rename quota key constants and Redis keys with api_ prefix

- QUOTA_DAILY_HASH  → API_QUOTA_DAILY_HASH
- QUOTA_WEEKLY_HASH → API_QUOTA_WEEKLY_HASH
- Redis key templates: quota:{ns}:... → api_quota:{ns}:...
- Local variables d_hash/w_hash → api_d_hash/api_w_hash in _check_api_quota
- Update test imports and assertions accordingly

Migration: flush old keys with
  redis-cli -n 1 --scan --pattern 'quota:*' | xargs -L 100 redis-cli -n 1 DEL

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

sapl/middleware/ratelimit.py

@@ -82,15 +82,15 @@ RL_INDEX_API_BLOCKED_IPS = 'rl:index:api_blocked_ips'
 
 # ---------------------------------------------------------------------------
 # API quota keys — per-tenant HASH, one key per period.
-# Structure: HASH key = quota:{ns}:daily:{date}  field = {ip}  value = counter
-#            HASH key = quota:{ns}:weekly:{week}  field = {ip}  value = counter
+# Structure: HASH key = api_quota:{ns}:daily:{date}  field = {ip}  value = counter
+#            HASH key = api_quota:{ns}:weekly:{week}  field = {ip}  value = counter
 # Weekly key uses ISO week notation (yyyy-Www) — unambiguous, Monday-anchored.
 # TTL set once on hash creation (Lua TTL guard); resets are implicit in the
 # date/week embedded in the key name.  Fields are IPs; no per-field TTL.
 # Memory: ~63 bytes/field vs ~148 bytes for per-IP STRING keys (~57% saving).
 # ---------------------------------------------------------------------------
-QUOTA_DAILY_HASH = 'quota:{ns}:daily:{date}'
-QUOTA_WEEKLY_HASH = 'quota:{ns}:weekly:{week}'
+API_QUOTA_DAILY_HASH = 'api_quota:{ns}:daily:{date}'
+API_QUOTA_WEEKLY_HASH = 'api_quota:{ns}:weekly:{week}'
 
 # ---------------------------------------------------------------------------
 # Bot UA fragments
@@ -607,13 +607,13 @@ class RateLimitMiddleware:
         week_str = f'{iso[0]}-W{iso[1]:02d}'
 
         ip = get_client_ip(request)
-        d_hash = QUOTA_DAILY_HASH.format(ns=_NAMESPACE, date=date_str)
-        w_hash = QUOTA_WEEKLY_HASH.format(ns=_NAMESPACE, week=week_str)
+        api_d_hash = API_QUOTA_DAILY_HASH.format(ns=_NAMESPACE, date=date_str)
+        api_w_hash = API_QUOTA_WEEKLY_HASH.format(ns=_NAMESPACE, week=week_str)
 
         try:
-            if _hincrby_with_ttl(d_hash, ip, 86400) > self.api_quota_daily:
+            if _hincrby_with_ttl(api_d_hash, ip, 86400) > self.api_quota_daily:
                 return 'daily'
-            if _hincrby_with_ttl(w_hash, ip, 7 * 86400) > self.api_quota_weekly:
+            if _hincrby_with_ttl(api_w_hash, ip, 7 * 86400) > self.api_quota_weekly:
                 return 'weekly'
         except Exception:
             pass  # fail open — quota not enforced when Redis unavailable

sapl/middleware/test_ratelimiter.py

@@ -20,8 +20,8 @@ from sapl.middleware.ratelimit import (
     _parse_rate,
     get_client_ip,
     make_ratelimit_cache_key,
-    QUOTA_DAILY_HASH,
-    QUOTA_WEEKLY_HASH,
+    API_QUOTA_DAILY_HASH,
+    API_QUOTA_WEEKLY_HASH,
     RateLimitMiddleware,
     RL_API_IP_BLOCKED,
     RL_API_IP_REQUESTS,
@@ -652,8 +652,8 @@ def test_api_quota_uses_hash_keys():
 
     today = date.today()
     iso = today.isocalendar()
-    expected_daily_hash = QUOTA_DAILY_HASH.format(ns=_NAMESPACE, date=today.isoformat())
-    expected_weekly_hash = QUOTA_WEEKLY_HASH.format(
+    expected_daily_hash = API_QUOTA_DAILY_HASH.format(ns=_NAMESPACE, date=today.isoformat())
+    expected_weekly_hash = API_QUOTA_WEEKLY_HASH.format(
         ns=_NAMESPACE, week=f'{iso[0]}-W{iso[1]:02d}'
     )
     calls = mock_h.call_args_list