diff --git a/cloud_pipelines_backend/api_server_sql.py b/cloud_pipelines_backend/api_server_sql.py
index 9341db4..adc7dcb 100644
--- a/cloud_pipelines_backend/api_server_sql.py
+++ b/cloud_pipelines_backend/api_server_sql.py
@@ -241,13 +241,10 @@ def create_pipeline_run_response(
                             pipeline_name = component_spec.name
                 response.pipeline_name = pipeline_name
             if include_execution_stats:
-                execution_status_stats = self._calculate_execution_status_stats(
-                    session=session, root_execution_id=pipeline_run.root_execution_id
+                response.execution_status_stats = self._get_execution_status_stats(
+                    session=session,
+                    root_execution_id=pipeline_run.root_execution_id,
                 )
-                response.execution_status_stats = {
-                    status.value: count
-                    for status, count in execution_status_stats.items()
-                }
             return response
 
         return ListPipelineJobsResponse(
@@ -258,6 +255,16 @@ def create_pipeline_run_response(
             next_page_token=next_page_token,
         )
 
+    def _get_execution_status_stats(
+        self,
+        session: orm.Session,
+        root_execution_id: bts.IdType,
+    ) -> dict[str, int]:
+        stats = self._calculate_execution_status_stats(
+            session=session, root_execution_id=root_execution_id
+        )
+        return {status.value: count for status, count in stats.items()}
+
     def _calculate_execution_status_stats(
         self, session: orm.Session, root_execution_id: bts.IdType
     ) -> dict[bts.ContainerExecutionStatus, int]:
diff --git a/tests/test_api_server_sql.py b/tests/test_api_server_sql.py
index c0f26a7..8120575 100644
--- a/tests/test_api_server_sql.py
+++ b/tests/test_api_server_sql.py
@@ -1,5 +1,50 @@
+from sqlalchemy import orm
+
 from cloud_pipelines_backend import backend_types_sql as bts
-from cloud_pipelines_backend.api_server_sql import ExecutionStatusSummary
+from cloud_pipelines_backend import database_ops
+from cloud_pipelines_backend.api_server_sql import (
+    ExecutionStatusSummary,
+    PipelineRunsApiService_Sql,
+)
+
+
+def _initialize_db_and_get_session_factory():
+    db_engine = database_ops.create_db_engine_and_migrate_db(database_uri="sqlite://")
+    return lambda: orm.Session(bind=db_engine)
+
+
+def _create_execution_node(session, task_spec=None, status=None, parent=None):
+    """Helper to create an ExecutionNode with optional status and parent."""
+    node = bts.ExecutionNode(task_spec=task_spec or {})
+    if parent is not None:
+        node.parent_execution = parent
+    if status is not None:
+        node.container_execution_status = status
+    session.add(node)
+    session.flush()
+    return node
+
+
+def _link_ancestor(session, execution_node, ancestor_node):
+    """Create an ExecutionToAncestorExecutionLink."""
+    link = bts.ExecutionToAncestorExecutionLink(
+        ancestor_execution=ancestor_node,
+        execution=execution_node,
+    )
+    session.add(link)
+    session.flush()
+
+
+def _create_pipeline_run(session, root_execution, created_by=None, annotations=None):
+    """Helper to create a PipelineRun linked to a root execution node."""
+    run = bts.PipelineRun(root_execution=root_execution)
+    if created_by:
+        run.created_by = created_by
+    if annotations:
+        run.annotations = annotations
+    session.add(run)
+    session.flush()
+    return run
 
 
 class TestExecutionStatusSummary:
@@ -55,3 +100,59 @@ def test_accumulate_all_statuses(self):
             assert summary.total_executions == expected_total
             assert summary.ended_executions == expected_ended
             assert summary.has_ended == (expected_ended == expected_total)
+
+
+class TestPipelineRunServiceList:
+    def test_list_empty(self):
+        session_factory = _initialize_db_and_get_session_factory()
+        service = PipelineRunsApiService_Sql()
+        with session_factory() as session:
+            result = service.list(session=session)
+            assert result.pipeline_runs == []
+            assert result.next_page_token is None
+
+    def test_list_returns_pipeline_runs(self):
+        session_factory = _initialize_db_and_get_session_factory()
+        service = PipelineRunsApiService_Sql()
+        with session_factory() as session:
+            root = _create_execution_node(session)
+            root_id = root.id
+            _create_pipeline_run(session, root, created_by="user1")
+            session.commit()
+
+        with session_factory() as session:
+            result = service.list(session=session)
+            assert len(result.pipeline_runs) == 1
+            assert result.pipeline_runs[0].root_execution_id == root_id
+            assert result.pipeline_runs[0].created_by == "user1"
+            assert result.pipeline_runs[0].execution_status_stats is None
+
+    def test_list_with_execution_stats(self):
+        session_factory = _initialize_db_and_get_session_factory()
+        service = PipelineRunsApiService_Sql()
+        with session_factory() as session:
+            root = _create_execution_node(session)
+            root_id = root.id
+            child1 = _create_execution_node(
+                session,
+                parent=root,
+                status=bts.ContainerExecutionStatus.SUCCEEDED,
+            )
+            child2 = _create_execution_node(
+                session,
+                parent=root,
+                status=bts.ContainerExecutionStatus.RUNNING,
+            )
+            _link_ancestor(session, child1, root)
+            _link_ancestor(session, child2, root)
+            _create_pipeline_run(session, root)
+            session.commit()
+
+        with session_factory() as session:
+            result = service.list(session=session, include_execution_stats=True)
+            assert len(result.pipeline_runs) == 1
+            assert result.pipeline_runs[0].root_execution_id == root_id
+            stats = result.pipeline_runs[0].execution_status_stats
+            assert stats is not None
+            assert stats["SUCCEEDED"] == 1
+            assert stats["RUNNING"] == 1