MOD: Upgrade databento_dbn to 0.58.0

Author: nmacholl

CHANGELOG.md

@@ -6,8 +6,13 @@
 - Added time-based backpressure to the live client: pauses reading records from the live
   gateway when the internal queue spans more than 1 second of data by `ts_index`
   (`ts_recv` when present, otherwise `ts_event`)
-- Added `INDEX` `InstrumentClass` variant
-- Added `StatType` variants `INDICATIVE_CLOSE_PRICE` and `VENUE_SPECIFIC_PRICE_1`
+- Upgraded `databento-dbn` to 0.58.0:
+  - Added flat per-level properties (`bid_px_00`, `pretty_ask_px_03`, etc.) to the
+    Python `MBP1Msg`, `MBP10Msg`, `BBOMsg`, `CMBP1Msg`, and `CBBOMsg` record classes
+    for parity with the DataFrame layout
+  - Added `INDEX` `InstrumentClass` variant
+  - Added `StatType` variants `INDICATIVE_CLOSE_PRICE` and `VENUE_SPECIFIC_PRICE_1`
+
 
 ## 0.77.0 - 2026-04-28
 

README.md

@@ -32,7 +32,7 @@ The library is fully compatible with distributions of Anaconda 2023.x and above.
 The minimum dependencies as found in the `pyproject.toml` are also listed below:
 - python = "^3.10"
 - aiohttp = "^3.8.3"
-- databento-dbn = "~0.56.0"
+- databento-dbn = "~0.58.0"
 - numpy = ">=1.23.5"
 - pandas = ">=1.5.3"
 - pip-system-certs = ">=4.0" (Windows only)

pyproject.toml

@@ -10,7 +10,7 @@ dynamic = [ "classifiers" ]
 dependencies = [
     "aiohttp>=3.8.3,<4.0.0; python_version < '3.12'",
     "aiohttp>=3.9.0,<4.0.0; python_version >= '3.12'",
-    "databento-dbn~=0.56.0",
+    "databento-dbn~=0.58.0",
     "numpy>=1.23.5; python_version < '3.12'",
     "numpy>=1.26.0; python_version >= '3.12'",
     "pandas>=1.5.3,<4.0.0",

tests/test_historical_data.py

@@ -52,10 +52,7 @@ def test_mbp_fields(
     difference = fields.symmetric_difference(struct._ordered_fields)
 
     # Assert
-    assert "levels" in difference
-
-    # bid/ask size, price, ct for each level, plus the levels field
-    assert len(difference) == 6 * level_count + 1
+    assert difference == {"levels"}
 
 
 @pytest.mark.parametrize(