feat: let initiators withdraw running process instances

Co-authored-by: Cursor <cursoragent@cursor.com>

ordo-storage-jdbc/src/main/java/com/jetlumen/ordo/storage/jdbc/JdbcProcessInstanceRepository.java

@@ -19,6 +19,8 @@ public final class JdbcProcessInstanceRepository implements ProcessInstanceRepos
                     + " VALUES (?, ?, ?, ?, ?, ?, ?)";
     private static final String UPDATE_INSTANCE =
             "UPDATE ordo_process_instance SET status = ?, finished_at = ? WHERE id = ?";
+    private static final String COMPLETE_IF_RUNNING =
+            "UPDATE ordo_process_instance SET status = ?, finished_at = ? WHERE id = ? AND status = 'RUNNING'";
     private static final String SELECT_INSTANCE =
             "SELECT id, definition_id, initiator, status, context_json, started_at, finished_at"
                     + " FROM ordo_process_instance WHERE id = ?";
@@ -91,4 +93,18 @@ public final class JdbcProcessInstanceRepository implements ProcessInstanceRepos
             connectionProvider.close(connection);
         }
     }
+
+    @Override
+    public boolean completeIfRunning(ProcessInstance completed) {
+        Objects.requireNonNull(completed, "completed must not be null");
+        Connection connection = connectionProvider.getConnection();
+        try (PreparedStatement update = connection.prepareStatement(COMPLETE_IF_RUNNING)) {
+            ProcessInstanceMapper.bindUpdate(update, completed);
+            return update.executeUpdate() == 1;
+        } catch (SQLException e) {
+            throw new JdbcStorageException("failed to complete instance: " + completed.id(), e);
+        } finally {
+            connectionProvider.close(connection);
+        }
+    }
 }