findById method
Busca por id.
Implementation
@override
Future<Map<String, Object?>?> findById(String table, Object id) async {
final r = await _client.get(
Uri.parse('$_base/$table?id=eq.$id&limit=1'),
headers: _headers,
);
final rows = jsonDecode(r.body) as List;
return rows.isEmpty ? null : (rows.first as Map).cast<String, Object?>();
}