Simplify the first migration, we will do execute statements later

migrations/versions/0313_email_access_validated_at.py

@@ -16,24 +16,6 @@ down_revision = '0312_populate_returned_letters'
 def upgrade():
     # ### commands auto generated by Alembic - please adjust! ###
     op.add_column('users', sa.Column('email_access_validated_at', sa.DateTime(), nullable=True))
-    # if user has email_auth, set email_access_validated_at on last login, else set it at user created_at date.
-    op.execute("""
-        UPDATE
-            users
-        SET
-            email_access_validated_at = created_at
-    """)
-    op.execute("""
-        UPDATE
-            users
-        SET
-            email_access_validated_at = logged_in_at
-        WHERE
-            auth_type = 'email_auth'
-        AND
-            logged_in_at IS NOT NULL
-    """)
-    op.alter_column('users', 'email_access_validated_at', nullable=False)
     # ### end Alembic commands ###