- Add GaussDB/openGauss support via ODBC (resolves#106)
- Use pg_catalog queries instead of information_schema for compatibility
- Share ODBC environment across drivers with auto ODBCSYSINI detection
- Fix ODBC error message false positive on "Driver" keyword match
- Merge connection dialog categories into a single flat list
- Remove duplicate DDL button from data grid footer
Connect to DM8 databases using the odbc-api crate with unixODBC.
Includes schema browsing, query execution, DDL generation,
and full frontend integration with download link to DM ODBC driver.
Add schema selector to the editor toolbar for schema-aware databases
(PostgreSQL, SQL Server, Oracle). When a schema is selected, the backend
sets the appropriate search_path before executing queries so users no
longer need to write schema-qualified table names.