test: lift stalwart ratelimits

Claude has been trying to disable rate-limiting in Stalwart.  I still
got up some RateLimit errors while doing testing on the scheduling,
but while asking Claude to continue debugging it, the problems
disappeared and never came back.  Hm.

prompt: The stalwart docker image stops working every now and then when
  running test code due to ratelimiting errors.  Any possibilities for
  deactivating this in the docker image?
(followup-promps complaining that it isn't working)

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

Author: tobixen

tests/docker-test-servers/stalwart/setup_stalwart.sh

@@ -124,6 +124,24 @@ for i in $(seq 1 $max_caldav_attempts); do
     sleep 2
 done
 
+echo ""
+echo "Disabling rate limiting for test environment..."
+# Stalwart applies HTTP and authentication rate limits by default, which causes
+# 429 responses during rapid test runs. Append generous limits to config inside
+# the container, then reload.
+docker exec "$CONTAINER_NAME" sh -c 'cat >> /opt/stalwart/etc/config.toml << '"'"'EOF'"'"'
+
+[http]
+rate-limit-anonymous = { count = 999999999, period = "1m" }
+rate-limit-authenticated = { count = 999999999, period = "1m" }
+EOF'
+RELOAD_RESULT=$(curl -s -u "${ADMIN_USER}:${ADMIN_PASSWORD}" "${API_BASE}/reload")
+if echo "$RELOAD_RESULT" | grep -q '"errors":{}'; then
+    echo "Rate limiting disabled (config reloaded)"
+else
+    echo "Warning: config reload result: $RELOAD_RESULT"
+fi
+
 echo ""
 echo "Stalwart setup complete!"
 echo ""

tests/test_async_integration.py

@@ -503,8 +503,6 @@ def _skip_unless_support(self, feature: str) -> None:
     @pytest_asyncio.fixture
     async def scheduling_setup(self) -> Any:
         """Create async clients/principals/calendars for each scheduling user."""
-        import uuid
-
         from caldav.aio import get_async_davclient
 
         from .fixture_helpers import aget_or_create_test_calendar, cleanup_calendar_objects
@@ -523,11 +521,14 @@ async def scheduling_setup(self) -> Any:
                 await client.close()
                 continue
             principal = await client.principal()
+            ## Use a fixed cal_id (not a random UUID) so the same calendar is
+            ## reused across test runs and does not accumulate on the server.
+            ## This mirrors the sync scheduling tests which use fixed calendar names.
             cal, _ = await aget_or_create_test_calendar(
                 client,
                 principal,
                 calendar_name=f"async scheduling test {i}",
-                cal_id=f"asyncschedtest{uuid.uuid4().hex[:8]}",
+                cal_id=f"asyncschedtest{i}",
             )
             if cal is None:
                 await client.close()