diff --git a/stateful/src/main/java/jakarta/data/repository/stateful/StatefulRepository.java b/stateful/src/main/java/jakarta/data/repository/stateful/StatefulRepository.java
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+++ b/stateful/src/main/java/jakarta/data/repository/stateful/StatefulRepository.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2026 Contributors to the Eclipse Foundation
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ *  SPDX-License-Identifier: Apache-2.0
+ */
+package jakarta.data.repository.stateful;
+
+import jakarta.data.repository.DataRepository;
+
+/**
+ * TODO documentation
+ *
+ * @param <T> the type of the primary entity class of the repository.
+ * @param <K> the type of the unique identifier attribute of the primary
+ *            entity.
+ * @since 1.1
+ */
+@SuppressWarnings("PMD.ImplicitFunctionalInterface")
+public interface StatefulRepository<T, K> extends DataRepository<T, K> {
+
+    /**
+     * <p>Flush all changes represented in the persistence context to the
+     * database.</p>
+     */
+    void flush();
+}
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