diff --git a/api/alembic/versions/b14d95497d4f_update_required_fields_for_storage_backends.py b/api/alembic/versions/b14d95497d4f_update_required_fields_for_storage_backends.py
new file mode 100644
index 0000000..168d182
--- /dev/null
+++ b/api/alembic/versions/b14d95497d4f_update_required_fields_for_storage_backends.py
@@ -0,0 +1,50 @@
+"""Update required fields for storage backends
+
+Revision ID: b14d95497d4f
+Revises: 5bb5281de909
+Create Date: 2026-01-31 15:28:39.601499
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "b14d95497d4f"
+down_revision: Union[str, Sequence[str], None] = "5bb5281de909"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    """Upgrade schema.
+    升级数据库架构：
+    - 将 storage_backends 表的 workspace_id 字段设为必填
+    """
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "storage_backends",
+        "workspace_id",
+        existing_type=sa.VARCHAR(length=36),
+        nullable=False,
+    )
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    """Downgrade schema.
+    降级数据库架构：
+    - 恢复 storage_backends 表的 workspace_id 字段为可选
+
+    """
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.alter_column(
+        "storage_backends",
+        "workspace_id",
+        existing_type=sa.VARCHAR(length=36),
+        nullable=True,
+    )
+    # ### end Alembic commands ###