Fix migration 010: add column existence check for email_verification_expires

alembic/versions/010_add_email_verification_expires.py

@@ -20,7 +20,15 @@ depends_on: Union[str, Sequence[str], None] = None
 
 
 def upgrade() -> None:
-    """Add email_verification_expires column"""
+    """Add email_verification_expires column (skip if already exists)"""
+    from sqlalchemy import inspect
+
+    conn = op.get_bind()
+    inspector = inspect(conn)
+    existing_columns = {col['name'] for col in inspector.get_columns('users')}
+
+    # Add email_verification_expires if missing
+    if 'email_verification_expires' not in existing_columns:
         op.add_column('users', sa.Column('email_verification_expires', sa.DateTime(), nullable=True))