diff --git a/backend/alembic/versions/019_upgrade_model.py b/backend/alembic/versions/019_upgrade_model.py
new file mode 100644
index 0000000..3e55c1e
--- /dev/null
+++ b/backend/alembic/versions/019_upgrade_model.py
@@ -0,0 +1,61 @@
+"""019_upgrade_model
+
+Revision ID: dcaecd481715
+Revises: 863105882eba
+Create Date: 2025-07-04 14:45:56.927188
+
+"""
+from alembic import op
+import sqlalchemy as sa
+import sqlmodel.sql.sqltypes
+from sqlalchemy.dialects import postgresql
+
+# revision identifiers, used by Alembic.
+revision = 'dcaecd481715'
+down_revision = '863105882eba'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    op.drop_index(op.f('ix_ai_model_id'), table_name='ai_model')
+    op.drop_table('ai_model')
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.create_table('ai_model',
+    sa.Column('id', sa.BigInteger(), nullable=False),
+    sa.Column('api_key', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=True),
+    sa.Column('api_domain', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=False),
+    sa.Column('protocol', sa.Integer(), nullable=False),
+    sa.Column('supplier', sa.Integer(), nullable=False),
+    sa.Column('name', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=False),
+    sa.Column('model_type', sa.Integer(), nullable=False),
+    sa.Column('base_model', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=False),
+    sa.Column('default_model', sa.Boolean(), nullable=False),
+    sa.Column('config', sa.Text(), nullable=False),
+    sa.Column('status', sa.Integer(), nullable=False),
+    sa.Column('create_time', sa.BigInteger(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_ai_model_id'), 'ai_model', ['id'], unique=False)
+    # ### end Alembic commands ###
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_index(op.f('ix_ai_model_id'), table_name='ai_model')
+    op.drop_table('ai_model')
+    
+    op.create_table('ai_model',
+    sa.Column('id', sa.BigInteger(), nullable=False),
+    sa.Column('name', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=False),
+    sa.Column('type', sa.Integer(), nullable=False),
+    sa.Column('api_key', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=True),
+    sa.Column('endpoint', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=False),
+    sa.Column('max_context_window', sa.Integer(), nullable=False),
+    sa.Column('temperature', sa.Float(), nullable=False),
+    sa.Column('status', sa.Boolean(), nullable=False),
+    sa.Column('description', sqlmodel.sql.sqltypes.AutoString(length=255), nullable=True),
+    sa.Column('create_time', sa.BigInteger(), nullable=False),
+    sa.PrimaryKeyConstraint('id')
+    )
+    op.create_index(op.f('ix_ai_model_id'), 'ai_model', ['id'], unique=False)
+    # ### end Alembic commands ###