diff --git a/api/models/dataset.py b/api/models/dataset.py
index 50301dd2d7..eee5c39a0e 100644
--- a/api/models/dataset.py
+++ b/api/models/dataset.py
@@ -1715,7 +1715,7 @@ class SegmentAttachmentBinding(TypeBase):
     )
 
 
-class DocumentSegmentSummary(Base):
+class DocumentSegmentSummary(TypeBase):
     __tablename__ = "document_segment_summaries"
     __table_args__ = (
         sa.PrimaryKeyConstraint("id", name="document_segment_summaries_pkey"),
@@ -1725,25 +1725,40 @@ class DocumentSegmentSummary(Base):
         sa.Index("document_segment_summaries_status_idx", "status"),
     )
 
-    id: Mapped[str] = mapped_column(StringUUID, nullable=False, default=lambda: str(uuid4()))
+    id: Mapped[str] = mapped_column(
+        StringUUID,
+        nullable=False,
+        insert_default=lambda: str(uuid4()),
+        default_factory=lambda: str(uuid4()),
+        init=False,
+    )
     dataset_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
     document_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
     # corresponds to DocumentSegment.id or parent chunk id
     chunk_id: Mapped[str] = mapped_column(StringUUID, nullable=False)
-    summary_content: Mapped[str] = mapped_column(LongText, nullable=True)
-    summary_index_node_id: Mapped[str] = mapped_column(String(255), nullable=True)
-    summary_index_node_hash: Mapped[str] = mapped_column(String(255), nullable=True)
-    tokens: Mapped[int | None] = mapped_column(sa.Integer, nullable=True)
-    status: Mapped[str] = mapped_column(
-        EnumText(SummaryStatus, length=32), nullable=False, server_default=sa.text("'generating'")
+    summary_content: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    summary_index_node_id: Mapped[str | None] = mapped_column(String(255), nullable=True, default=None)
+    summary_index_node_hash: Mapped[str | None] = mapped_column(String(255), nullable=True, default=None)
+    tokens: Mapped[int | None] = mapped_column(sa.Integer, nullable=True, default=None)
+    status: Mapped[SummaryStatus] = mapped_column(
+        EnumText(SummaryStatus, length=32),
+        nullable=False,
+        server_default=sa.text("'generating'"),
+        default=SummaryStatus.GENERATING,
+    )
+    error: Mapped[str | None] = mapped_column(LongText, nullable=True, default=None)
+    enabled: Mapped[bool] = mapped_column(sa.Boolean, nullable=False, server_default=sa.text("true"), default=True)
+    disabled_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True, default=None)
+    disabled_by: Mapped[str | None] = mapped_column(StringUUID, nullable=True, default=None)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime, nullable=False, server_default=func.current_timestamp(), init=False
     )
-    error: Mapped[str] = mapped_column(LongText, nullable=True)
-    enabled: Mapped[bool] = mapped_column(sa.Boolean, nullable=False, server_default=sa.text("true"))
-    disabled_at: Mapped[datetime | None] = mapped_column(DateTime, nullable=True)
-    disabled_by = mapped_column(StringUUID, nullable=True)
-    created_at: Mapped[datetime] = mapped_column(DateTime, nullable=False, server_default=func.current_timestamp())
     updated_at: Mapped[datetime] = mapped_column(
-        DateTime, nullable=False, server_default=func.current_timestamp(), onupdate=func.current_timestamp()
+        DateTime,
+        nullable=False,
+        server_default=func.current_timestamp(),
+        onupdate=func.current_timestamp(),
+        init=False,
     )
 
     def __repr__(self):
diff --git a/api/services/summary_index_service.py b/api/services/summary_index_service.py
index a91f49e9e6..cf39469be8 100644
--- a/api/services/summary_index_service.py
+++ b/api/services/summary_index_service.py
@@ -349,7 +349,6 @@ class SummaryIndexService:
                                     summary_record_id,
                                 )
                                 summary_record_in_session = DocumentSegmentSummary(
-                                    id=summary_record_id,  # Use the same ID if available
                                     dataset_id=dataset.id,
                                     document_id=segment.document_id,
                                     chunk_id=segment.id,
@@ -360,6 +359,9 @@ class SummaryIndexService:
                                     status=SummaryStatus.COMPLETED,
                                     enabled=True,
                                 )
+                                if summary_record_in_session is None:
+                                    raise RuntimeError("summary_record_in_session should not be None at this point")
+                                summary_record_in_session.id = summary_record_id
                                 session.add(summary_record_in_session)
                                 logger.info(
                                     "Created new summary record (id=%s) for segment %s after vectorization",