User-defined SRIDs are not working after Postgis 3.3.2 to 3.5.3 update

[Alexander Trufanov]

Hello,

I have a Debian Bookworm-based system with Postgresql 15 and PostGis 3.3.2
on it.
It works well, but recently I was faced with a requirement to use ST_Clip()
function with touching argument support. Thus I need PostGis 3.5.x+.

There was no PostGis newer than 3.3.2 in the official repos, but I managed
to installed it with

```

sudo apt install -y postgresql-common
sudo /usr/share/postgresql-common/pgdg/apt.postgresql.org.sh bookworm

sudo apt install postgis=3.5* postgresql-15-postgis-3=3.5*
postgresql-15-postgis-3-scripts=3.5*
```

Then I updated my Postgis extension.

And now I'm facing an unexpectable problem. All my stored procedures are
working fine unless they are trying to use user-defined SRIDs from the
public.spatial_ref_sys. If so, they fail with following error message:

"ERROR: Unable to determine 'postgis' install schema
SQL state: XX000"

For example, this works:
SELECT ST_Transform('SRID=4326;POINT(0 0)'::geometry, 4326)
and this is not:
SELECT ST_Transform('SRID=4326;POINT(0 0)'::geometry, 100100)

My 100100 srid record is:
select * from public.spatial_ref_sys where srid = 100100
100100, '', 1, 'GEOGCS["WGS 84",    DATUM["WGS_1984",        SPHEROID["WGS
84",6378137,298.257223563,            AUTHORITY["EPSG","7030"]],
 AUTHORITY["EPSG","6326"]],    PRIMEM["Greenwich",0],
 UNIT["degree",0.0174532925199433],    AUTHORITY["EPSG","4326"]]',
'+proj=longlat +datum=WGS84 +no_defs'

I was trying to update this record in the table in case there is some
trigger that should register it  in some new cache or config - but it does
not help.

Is there any cache or something else  to clean in public.spatial_ref_sys
for postgis 4.5.3?
Maybe user-defined srids should now be registered in another way?

Also the error message "Unable to determine 'postgis' install schema  " is
quite confusing.

-- 
With best regards,
Alexander Trufanov
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