-- Remove enhanced settings columns and indexes
DROP INDEX IF EXISTS idx_settings_user_id;
DROP INDEX IF EXISTS idx_settings_category;

-- Note: SQLite doesn't support DROP COLUMN, so we recreate the table
CREATE TABLE settings_backup AS
SELECT key, val
FROM settings;
DROP TABLE settings;
CREATE TABLE settings
(
    key TEXT PRIMARY KEY,
    val TEXT NOT NULL
);
INSERT INTO settings
SELECT key, val
FROM settings_backup;
DROP TABLE settings_backup;