Query MongoDB timestamps using normalized ISO string bounds

tests/test_mongodb_queries.py

@@ -0,0 +1,32 @@
+from datetime import datetime, timedelta, timezone
+from typing import Any, Iterator, Tuple
+from unittest.mock import MagicMock, patch
+
+import pytest
+
+from great_ai import MongoDbDriver
+
+
+@pytest.fixture
+def mongo() -> Iterator[Tuple[MongoDbDriver, Any]]:
+    driver = MongoDbDriver.__new__(MongoDbDriver)
+    driver.mongo_connection_string = "mongodb://test"
+    driver.mongo_database = "test"
+    with patch("great_ai.persistence.mongodb_driver.MongoClient") as factory:
+        client = factory.__getitem__.return_value.return_value.__enter__.return_value
+        collection = client.__getitem__.return_value.traces
+        collection.count_documents.return_value = 3
+        collection.find.return_value.__enter__.return_value = []
+        yield driver, collection
+
+
+def test_mongo_date_bounds_match_stored_iso_strings(
+    mongo: Tuple[MongoDbDriver, Any],
+) -> None:
+    driver, collection = mongo
+    since = datetime(2026, 1, 1, 1, tzinfo=timezone(timedelta(hours=1)))
+    until = datetime(2026, 1, 2)
+    driver.query(since=since, until=until)
+    predicates = collection.find.call_args.kwargs["filter"]["$and"]
+    assert {"created": {"$gte": "2026-01-01T00:00:00"}} in predicates
+    assert {"created": {"$lte": "2026-01-02T00:00:00"}} in predicates