def downgrade():
if op._proxy.migration_context.dialect.name == '<STR_LIT>':<EOL><INDENT>op.alter_column(<EOL>'<STR_LIT>',<EOL>'<STR_LIT>',<EOL>type_=sa.dialects.postgresql.JSON,<EOL>postgresql_using='<STR_LIT>'<EOL>)<EOL><DEDENT>
Downgrade database.