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5 changes: 4 additions & 1 deletion README.md
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[![pypi](https://img.shields.io/pypi/v/lsst-daf-relation.svg)](https://pypi.org/project/lsst-daf-relation/)
[![codecov](https://codecov.io/gh/lsst/daf_relation/branch/main/graph/badge.svg?token=2BUBL8R9RH)](https://codecov.io/gh/lsst/daf_relation)

`daf_relation` is a package in the [LSST Science Pipelines](https://pipelines.lsst.io).
`daf_relation` was a package in the [LSST Science Pipelines](https://pipelines.lsst.io).
It was formerly used to implement the query system in [daf_butler](https://github.com/lsst/daf_butler/).

**As of November 2025, this package is no longer used or maintained.**

This package provides classes that represent relational algebra expression trees, along with algorithms to convert them to SQLAlchemy objects and Python generators.

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