diff --git a/api/migrations/versions/01587a13522f_202603131028.py b/api/migrations/versions/01587a13522f_202603131028.py
new file mode 100644
index 00000000..6412dedd
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+++ b/api/migrations/versions/01587a13522f_202603131028.py
@@ -0,0 +1,38 @@
+"""202603131028
+
+Revision ID: 01587a13522f
+Revises: fb834419b18f
+Create Date: 2026-03-13 10:28:43.601370
+
+"""
+from typing import Sequence, Union
+
+from alembic import op
+import sqlalchemy as sa
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision: str = '01587a13522f'
+down_revision: Union[str, None] = 'fb834419b18f'
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('tenants', sa.Column('default_language', sa.String(length=10), server_default='zh', nullable=False))
+    op.add_column('tenants', sa.Column('supported_languages', postgresql.ARRAY(sa.String(length=10)), server_default=sa.text("'{zh,en}'"), nullable=False))
+    op.create_index(op.f('ix_tenants_default_language'), 'tenants', ['default_language'], unique=False)
+    op.add_column('users', sa.Column('preferred_language', sa.String(length=10), server_default=sa.text("'zh'"), nullable=False))
+    op.create_index(op.f('ix_users_preferred_language'), 'users', ['preferred_language'], unique=False)
+    # ### end Alembic commands ###
+
+
+def downgrade() -> None:
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_users_preferred_language'), table_name='users')
+    op.drop_column('users', 'preferred_language')
+    op.drop_index(op.f('ix_tenants_default_language'), table_name='tenants')
+    op.drop_column('tenants', 'supported_languages')
+    op.drop_column('tenants', 'default_language')
+    # ### end Alembic commands ###