I also have other requirements:
1. if there is no changes should it can create nothing, not like this:
def upgrade():
### commands auto generated by Alembic - please adjust! ###
pass
### end Alembic commands ###
def downgrade():
### commands auto generated by Alembic - please adjust! ###
pass
### end Alembic commands ###
2. If I can merge the current changes into head revision, before I
execute upgrade, so that I can combine several changes into one
change. For me, I think just remove the head revision, and recreate
new one that's ok. And only problem I think is that : if the user has
manually changed the revision file, the changes will be lost.
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