Timeseriesflattener

Performance

* Aggregate with one groupby ([`d933d46`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/d933d46c8ecd87f80fd8a80b9f998a7a1ec83986))

Feature

* Further tweak benchmarks ([`f29654d`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/f29654d78271048b5d8746c5d37a7512d407ad83))

Feature

* **384:** Add benchmark ([`4d746de`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/4d746debe6cb8ac9a15c44e6f21bd2c77fbc0d45))

Fix

* Ensure all prediction times are kept when slicing ([397](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/issues/397)) ([`6a5aa16`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/6a5aa161fa9a0c4c1cdd1d0fcd5ed9befa30a221))
* Ensure all prediction times are kep when slicing ([`9e5cef4`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/9e5cef4f124072c28a57b17ed29574ae26bc912f))

Feature

* **356:** Validate shared columns exist in all specs on ingest ([`c0aa8cd`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/c0aa8cd98d2a0cd639c6b0cb58acb67677ed54a2))

Feature

* **379:** Check that no value columns have the same name ([`28518e0`](https://github.com/Aarhus-Psychiatry-Research/timeseriesflattener/commit/28518e0cf6a4b248652014ac5994dc227ffef275))