VER: Release 0.48.0

Author: threecgreen

CHANGELOG.md

@@ -1,5 +1,22 @@
 # Changelog
 
+## 0.48.0 - 2026-01-27
+
+### Enhancements
+- Added initial support for splitting DBN files:
+  - Added new `SplitEncoder` that supports synchronous and asynchronous encoding
+  - Added new `Splitter` trait that allows for extensible splitting of files while
+    reusing the `SplitEncoder` boilerplate.
+  - Added `SchemaSplitter`, `SymbolSplitter`, and `TimeSplitter` which allow for
+    different methods of splitting DBN files
+  - Added split support to the CLI. For example:
+    `dbn mbo.dbn --split-by week --output-pattern '{date}.json'` --json
+- Added new publisher for Blue Ocean ATS (`OCEA_MEMOIR_OCEA`)
+
+### Bug fixes
+- Fixed issue where `AsyncDynReader` instances created from `with_buffer()` would only
+  decode the first frame of multi-frame Zstandard files
+
 ## 0.47.0 - 2026-01-20
 
 ### Enhancements

Cargo.lock

@@ -11,7 +11,7 @@ resolver = "2"
 [workspace.package]
 authors = ["Databento <support@databento.com>"]
 edition = "2021"
-version = "0.47.0"
+version = "0.48.0"
 documentation = "https://databento.com/docs"
 repository = "https://github.com/databento/dbn"
 license = "Apache-2.0"

Cargo.toml

@@ -1,6 +1,6 @@
 [project]
 name = "databento-dbn"
-version = "0.47.0"
+version = "0.48.0"
 description = "Python bindings for encoding and decoding Databento Binary Encoding (DBN)"
 readme = "README.md"
 requires-python = ">=3.10"

python/pyproject.toml

@@ -16,15 +16,16 @@ name = "dbn"
 path = "src/main.rs"
 
 [dependencies]
-dbn = { path = "../dbn", version = "=0.47.0", default-features = false }
+dbn = { path = "../dbn", version = "=0.48.0", default-features = false }
 
-anyhow = { workspace = true }
+anyhow.workspace = true
 clap = { version = "4.5", features = ["derive", "wrap_help"] }
 serde = { workspace = true, features = ["derive"] }
-zstd = { workspace = true }
+time.workspace = true
+zstd.workspace = true
 
 [dev-dependencies]
 assert_cmd = "2.1"
 predicates = "3.1"
-rstest = { workspace = true }
 tempfile = "3.24"
+rstest.workspace = true

rust/dbn-cli/Cargo.toml

@@ -62,6 +62,18 @@ dbn equs-mini-20250331.dbn equs-mini-20250401.dbn equs-mini-20250402.dbn -o equs
 ```
 The only limitation is they must be from the same dataset.
 
+### Splitting DBN files
+You can also split one DBN file into several by passing `--split-by`/`-S` with a split method and
+`--output-pattern`/`-O` with a pattern for the output file names.
+```sh
+# By schema, such as from a live data capture
+dbn opra-pillar-20260114.dbn.zst --split-by schema --output-pattern 'opra-pillar-2026114.{schema}.dbn.zst'
+# By time
+dbn opra-pillar-202512.ohlcv-1s.dbn.zst --split-by day --output-pattern 'opra-pillar-{date}.ohlcv-1s.dbn.zst'
+# By symbol, with the short argument forms
+dbn equs-mini-20260114.dbn.zst -S symbol -O 'equs-mini-2026014-{symbol}.dbn.zst'
+```
+
 ### Compressing the output
 In addition to reading Zstandard-compressed files, `dbn` can also write compressed JSON and CSV.