add known issues. Add truth catalog FITS

- Visit         -- Information about LSST visits

- ForcedSource  -- Forced photometry on coadded image detections

- Object        -- Coadded image detections

- Truth         -- The AGILE truth catalog

- Truth         -- The AGILE truth catalog (see below)

The schema of each table follows closely that of DP0.2: (see here

https://dp0-2.lsst.io/data-products-dp0-2/index.html and here

https://dp0-2.lsst.io/data-products-dp0-2/index.html#id3).

The truth catalog follows the schema as presented in the appendix of Viitanen

et al., 2026 as illustrated in the table below.

Catalogs: truth catalog FITS file (14G)

+++++++++++++++++++++++++++++++++++++++

We provide the truth catalog as part of the master.db, as well as a standalone

FITS file in the DR1 repository. The truth catalog follows the schema as

presented in the appendix of Viitanen et al., 2026 as illustrated in the table

below.

.. image:: img/truth-columns.png

`deepCoadded` images in the LSST bands. The `calexp` images are provided for

each CCD, band, and visit separately. The  `deepCoadded` images follow the DC2

skymap tesselation scheme of `tracts` and `patches`.

Known issues

------------

AGN structure function at infinity

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

DR1 contains an error in the input structure function at infinity, i.e.

:math:`\mathrm{SF}_\infty`. This means that  In the DR1 released truth catalog,

:math:`\mathrm{SF}_\infty` is incorrectly divided by :math:`\sqrt{1+z}`, where

:math:`z` is the redshift associated with each source. The error is propagated

to the simulated images and the photometric catalogs.

To recover the correct values both in the truth catalog and in the photometric

catalogs, multiply by :math:`\sqrt{1+z}`:

.. math::

   \mathrm{SF}_{\infty,corrected} = \mathrm{SF}_\infty \times \sqrt{1+z}