Convert to using integral nanoseconds instead of datetime

nominal/core/dataset.py

@@ -4,7 +4,7 @@
 import time
 import urllib.parse
 from dataclasses import dataclass, field
-from datetime import datetime, timedelta
+from datetime import timedelta
 from io import TextIOBase
 from pathlib import Path
 from types import MappingProxyType
@@ -31,21 +31,28 @@
 from nominal.core._utils import HasRid, update_dataclass
 from nominal.core.channel import Channel, _get_series_values_csv
 from nominal.exceptions import NominalIngestError, NominalIngestFailed, NominalIngestMultiError
-from nominal.ts import _MAX_TIMESTAMP, _MIN_TIMESTAMP, _AnyTimestampType, _SecondsNanos, _to_typed_timestamp_type
+from nominal.ts import (
+    _MAX_TIMESTAMP,
+    _MIN_TIMESTAMP,
+    IntegralNanosecondsUTC,
+    _AnyTimestampType,
+    _SecondsNanos,
+    _to_typed_timestamp_type,
+)
 
 logger = logging.getLogger(__name__)
 
 
 @dataclass(frozen=True)
 class DatasetBounds:
-    start: datetime
-    end: datetime
+    start: IntegralNanosecondsUTC
+    end: IntegralNanosecondsUTC
 
     @classmethod
     def _from_conjure(cls, bounds: scout_catalog.Bounds) -> Self:
         return cls(
-            start=_SecondsNanos.from_api(bounds.start).to_datetime(),
-            end=_SecondsNanos.from_api(bounds.end).to_datetime(),
+            start=_SecondsNanos.from_api(bounds.start).to_nanoseconds(),
+            end=_SecondsNanos.from_api(bounds.end).to_nanoseconds(),
         )
 
 

tests/core/test_dataset.py

@@ -1,5 +1,5 @@
 import functools
-from datetime import datetime, timedelta, timezone
+from datetime import timedelta
 from unittest.mock import MagicMock, patch
 
 import pytest
@@ -30,10 +30,7 @@ def mock_dataset(mock_clients):
         rid="test-rid",
         name="Test Dataset",
         description="A dataset for testing",
-        bounds=DatasetBounds(
-            start=datetime(year=2021, month=10, day=9, hour=10, minute=9, second=10, tzinfo=timezone.utc),
-            end=datetime(year=2021, month=10, day=9, hour=11, minute=9, second=10, tzinfo=timezone.utc),
-        ),
+        bounds=DatasetBounds(start=123455, end=123456),
         properties={},
         labels=[],
         _clients=mock_clients,