turso

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Jussi Saurio 69d8a73028 Merge 'use virtual root page for sqlite_schema' from Mikaël Francoeur

This PR fixes a problem where `sqlite_schema` could be read before page
1 was allocated.
The fix is similar to that in SQLite. In SQLite, if `btreeCursor()` sees
that the root page is 1 and that the b-tree is empty, it sets the page
to 0 ([here](https://github.com/sqlite/sqlite/blob/master/src/btree.c#L4
691-L4696)). SQLite's `moveToRoot()` then uses this special value to
return `CURSOR_INVALID` with no rows ([here](https://github.com/sqlite/s
qlite/blob/master/src/btree.c#L5538-L5540)).
Fixes https://github.com/tursodatabase/turso/issues/2449

Reviewed-by: Jussi Saurio <jussi.saurio@gmail.com>

Closes #2551

2025-08-14 11:08:11 +03:00