fix(asap-tools): point the sketchdb arm at ASAPQuery's SQL endpoint

The engine's ClickHouse adapter serves SQL at /clickhouse/query; the
query client posted to the server URL's root, so every sketchdb query
got a 404.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

Author: milindsrivastava1997

asap-tools/experiments/datasets/fake_metric/sketch_bench_workloads.py

@@ -98,7 +98,8 @@
 
 OUT_CONFIG_DIR = "config/experiment_type/sketch_bench_clickhouse"
 CLICKHOUSE_URL = "http://localhost:8123"
-ASAP_URL = "http://localhost:8088"
+# ASAPQuery's ClickHouse adapter serves SQL here, not at ClickHouse's `/`.
+ASAP_URL = "http://localhost:8088/clickhouse/query"
 # Seconds after an eval time the client sends it, so data up to the eval
 # time has arrived.
 QUERY_TIME_OFFSET_SECS = 10

asap-tools/experiments/tests/test_sketch_bench_workloads.py

@@ -501,6 +501,11 @@ def test_sketchdb_arm_runs_the_structured_queries_on_the_saved_plan(self):
                         {"mode": "sketchdb", "server": "asap"},
                     ],
                 )
+                # The engine serves SQL at /clickhouse/query and 404s at `/`.
+                self.assertIn(
+                    {"name": "asap", "url": "http://localhost:8088/clickhouse/query"},
+                    ep["servers"],
+                )
                 validate_experiment_config(OmegaConf.create(ep))
 
                 out = os.path.join(tmp, "out")