-- Browser selection is gateway-owned; remove the obsolete control-plane schema.
ALTER TABLE browser_env
    DROP CONSTRAINT IF EXISTS browser_env_browser_version_fkey;
ALTER TABLE browser_env
    DROP COLUMN IF EXISTS browser_version;
ALTER TABLE audit_event
    DROP COLUMN IF EXISTS old_browser_version,
    DROP COLUMN IF EXISTS new_browser_version;
DROP TABLE IF EXISTS browser_version;