Wfdb

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**Handle more than 8 compressed signals in wrsamp**
Previously, the package did not support writing of compressed records with more than 8 channels.

**Use int64 instead of int for ann2rr**
Fixes 'np has no attribute np.int' error raised when running ann2rr.

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**Remove upper bound on dependencies**
Previously, the package provided restrictive caps on version number of dependencies. These caps have been removed.

**Miscellaneous style and typing fixes**
Various fixes were made to code style and handling of data types.

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**Converting a record into a DataFrame**
The new method :meth:`wfdb.Record.to_dataframe` can be used to convert signal data from a Record object into a Pandas DataFrame, which can then be manipulated using Pandas methods.

**Locating signals in a multi-segment record**
The new method :meth:`wfdb.MultiRecord.contained_ranges` can be used to search for time intervals within a record that contain a specific channel. The method :meth:`wfdb.MultiRecord.contained_combined_ranges` searches for time intervals that contain several specific channels at once.

**Writing custom annotation symbols**
The :func:`wfdb.wrann` function can now be used to write annotations with custom annotation types (``symbol`` strings.) Custom annotation types must be defined using the ``custom_labels`` argument.

**Correct rounding when converting floating-point signal data**
When calling :func:`wfdb.wrsamp` with a ``p_signal`` argument, input values will be *rounded* to the nearest sample value rather than being *truncated* towards zero. The same applies to the :meth:`wfdb.Record.adc` method.

**Writing signals in compressed format**
The :func:`wfdb.wrsamp` function, and the :meth:`wfdb.Record.wrsamp` method, now support writing compressed signal files. To write a compressed file, set the ``fmt`` value to ``"508"`` (for an 8-bit channel), ``"516"`` (for a 16-bit channel), or ``"524"`` (for a 24-bit channel).

**Decoding non-ASCII text in EDF files**
The :func:`wfdb.io.convert.edf.read_edf` and :func:`wfdb.io.convert.edf.rdedfann` functions now take an optional argument ``encoding``, which specifies the character encoding for text fields. ISO-8859-1 encoding is used by default, in contrast to older versions of the package which used UTF-8.

**Bug fixes when writing signal metadata**
When calling :meth:`wfdb.Record.wrsamp`, the checksum and samples-per-frame fields in the header file will correctly match the signal data, rather than relying on attributes of the Record object.

Fixes were added to address [changes to type promotion](https://numpy.org/devdocs/numpy_2_0_migration_guide.html#changes-to-numpy-data-type-promotion) that led to overflow errors (e.g. https://github.com/MIT-LCP/wfdb-python/issues/493).

**Fix UnboundLocalError in GQRS algorithm**
Fixes the GQRS algorithm to address an `UnboundLocalError`.

**Support write directory in `csv_to_wfdb`**
`write_dir` can now be specified when calling `csv_to_wfdb`.

**Use uv for for package management**
Moves package management from poetry to uv.

**Fix misordered arguments in `util.lines_to_file`**
Fixes misordered arguments in `util.lines_to_file`.

**Allow signals to be written with unique samples per frame**
Adds capability to write signal with unique samps_per_frame to `wfdb.io.wrsamp`.

**Allow expanded physical signal in `calc_adc_params`**
Updates `calc_adc_params` to allow an expanded physical signal to be passed. Previously only a non-expanded signal was allowed.

**Allow selection of channels when converting to EDF**
Fixes the `wfdb-to_edf()` function to support an optional channels argument.

**Migrates Ricker wavelet from SciPy to WFDB after deprecation**
The Ricker wavelet (`scipy.signal.ricker`) was removed in SciPy v1.15, so the original implementation was migrated to the WFDB package.

**Miscellaneous style and typing fixes**
Various fixes were made to code style and handling of data types.