Piccolo-admin

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Improved the handling of nullable ``JSON`` / ``JSONB`` columns in the UI.

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When deleting a row, if a problem is encountered then an error message is now
shown in the UI.

This is useful if we have constraints on the table (for example
``ON DELETE RESTRICT``).

Support for Python 3.7 was dropped as it's now end of life.

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Improved the behaviour of the `referencing tables` links on the detail page.

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Improved the UI for JSON fields (the cursor would sometimes jump to the
bottom).

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Version pinning Pydantic to v1, as v2 has breaking changes.

We will add support for Pydantic v2 in a future release.

Thanks to sinisaos for helping with this.

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Improved the UI for password inputs (e.g. on the change password page). Thanks
to sinisaos for this.

Fixed a bug with nullable date fields.

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