Which databases are supported by CodeIgniter Wizard?

The CI Wiz application itself currently supports only MySQL and MariaDB as the source schema. That is the database it connects to and reads from during code generation. The generated applications are a different matter. Since they are standard CI4 Composer projects, you can switch the database driver after generation to anything CI4 supports — PostgreSQL, SQLite, MSSQL — as long as you migrate your data and verify compatibility. The generated code uses CI4's query builder, so driver-specific SQL is minimal. There are no hard MySQL-isms baked into the generated code.