Store the SRID when creating a database and reject geographic SRIDs

[ryan-kipawa]

Fixes #141.

What was wrong

• db.srid == -1 after create(). CreateModelTables uses its srid argument only to look up a projection string. The SRID it stores, in m_Configuration and geometry_columns, stays at -1. So Database.srid reads -1, and geometry written later is tagged -1. The same happens when only projection_string is given.
• srid=4326 gives Google Maps - Mercator. When no projection string is passed, MIKE+ replaces a geographic projection with Google Maps - Mercator, without saying so.

MIKE+ GUI comparison

I created a new model through the MIKE+ 2026 U1 GUI (File → New, Coordinate system → Browse). With ETRS89 / UTM zone 32N chosen after Sirius (25832) had been open, the database stored 25832. I then chose ETRS89 / UTM zone 33N, also after Sirius. It stored the 33N projection string but SRID 25832. So the GUI doesn't derive the SRID from the chosen projection either: it carries over the SRID of the project open before. That one is a MIKE+ bug, which I'll report separately. The GUI only offers projected systems (plus Google Maps - Mercator), never geographic ones.

Fix

• When srid is given, create() looks up its WKT with GetProjectionOGCWKT in a throwaway database before any target file is touched, so overwrite=True still keeps the old file on bad input. Unknown and geographic SRIDs raise ValueError. The WKT is passed to CreateModelTables.
• When only projection_string is given, the SRID is derived with GetSRIDFromProjStr.
• After CreateModelTables, the SRID is written to m_Configuration and geometry_columns. A node inserted afterwards is stored with SRID 25832, checked in the geometry blob.
• The user guide prints srid again, and there's a changelog entry.

Tests

pytest tests/database/test_database.py -k "Create or srid or projection" passes (16 tests) against MIKE+ 2026 U1. New tests:

• srid=25832 round trip, including a geometry insert;
• srid derived from projection_string;
• 4326 and 999999 raise ValueError and keep the existing file under overwrite=True.

just lint and just typecheck pass. just lint-changed reports nothing in database.py; its remaining errors are in files this PR doesn't touch.

🤖 Generated with Claude Code

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