fixed migrations

migrations/versions/c243d6a1843d_add_last_name_to_user_model.py

@@ -7,6 +7,7 @@ Create Date: 2025-05-23 16:00:09.905001
 """
 from alembic import op
 import sqlalchemy as sa
+from sqlalchemy import inspect
 
 
 # revision identifiers, used by Alembic.
@@ -18,8 +19,13 @@ depends_on = None
 
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
+    conn = op.get_bind()
+    inspector = inspect(conn)
+    columns = [col['name'] for col in inspector.get_columns('user')]
+    
     with op.batch_alter_table('user', schema=None) as batch_op:
-        batch_op.add_column(sa.Column('last_name', sa.String(length=150), nullable=True))
+        if 'last_name' not in columns:
+            batch_op.add_column(sa.Column('last_name', sa.String(length=150), nullable=True))
 
     # ### end Alembic commands ###