nmig/extra_config.json

{
    "README" : [
        "This JSON document represents an additional configuration options.",
        "These options (currently only renaming) will be applied during migration if, and only if",
        "the 'enable_extra_config' attribute from 'config.json' is set true.",
        "By default the 'enable_extra_config' is false, hence the options",
        "described here will not take effect.",
        "Following lines are an example of expected renaming format.",
        "Feel free to modify them."
    ],

    "tables" : [
        {
            "name" : {
                "original" : "admins",
                "new" : "renamed_admins"
            },

            "columns" : [
                {
                    "original" : "id",
                    "new" : "renamed_id"
                },

                {
                    "original" : "username",
                    "new" : "renamed_username"
                },

                {
                    "original" : "password",
                    "new" : "renamed_password"
                }
            ]
        },

        {
            "name" : {
                "original" : "logs",
                "new" : "renamed_logs"
            },

            "columns" : [
                {
                    "original" : "id",
                    "new" : "renamed_id"
                }
            ]
        }
    ]
}