loadRun method
Implementation
@override
Future<Map<String, dynamic>?> loadRun(String runId) async {
await _ensureTable();
final rows = await DB.query(
'SELECT run_json FROM $_tableName WHERE run_id = ? ORDER BY id DESC ${DB.buildLimitClause(1)}',
positionalParams: [runId],
);
if (rows.isEmpty) return null;
return _decodeMap(rows.first['run_json']);
}