Editing the datastore table, and the serialized data, isn't really recommended unless you really know what you are doing. If you are using a recent version of the software, you should be able to just change the bburl in the settings table and then upload the tools.php file from the do_not_upload directory to your admincp and point your browser at it and then click to rebuild the Options Bitfields. You will need to upload the /install directory (without the /cmsdefaultdata directory or the install.php or upgrade.php file) in order to run the tools.php script.
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