[server] portable dump format supports now ZIP64 extensions by default (closes #1912535) ZIP files can use the ZIP64 extensions when the zipfile is larger than 2 GB. zipfile will raise an exception when the ZIP file would require ZIP64 extensions. Note: ZIP64 extensions are disabled by default in stdlib because the default zip and unzip commands on Unix (the InfoZIP utilities) don’t support these extensions.

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if repo.system_source.dbdriver == 'postgres':

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    sql('ALTER TABLE appears ADD COLUMN weight float')

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    sql('UPDATE appears SET weight=1.0 ')