use int if you have a small number of classes,
Последние новости，这一点在夫子中也有详细论述
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在地处热带的冈比亚中河区广袤原野上，炽热的阳光照耀着一片无垠的金色海洋。微风拂过，稻穗轻轻晃动，稻叶沙沙作响。看着眼前的马鲁奥农场，农场主穆萨·达博欣喜不已：“这预示着又一个丰收季节。”
Git packfiles use delta compression, storing only the diff when a 10MB file changes by one line, while the objects table stores each version in full. A file modified 100 times takes about 1GB in Postgres versus maybe 50MB in a packfile. Postgres does TOAST and compress large values, but that’s compressing individual objects in isolation, not delta-compressing across versions the way packfiles do, so the storage overhead is real. A delta-compression layer that periodically repacks objects within Postgres, or offloads large blobs to S3 the way LFS does, is a natural next step. For most repositories it still won’t matter since the median repo is small and disk is cheap, and GitHub’s Spokes system made a similar trade-off years ago, storing three full uncompressed copies of every repository across data centres because redundancy and operational simplicity beat storage efficiency even at hundreds of exabytes.，详情可参考WPS下载最新地址
Ofcom says that after provisional ruling it could apply to courts to demand internet providers stop access to site