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.
The Halley VI Research Station looks like something from a science fiction movie
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2025年7月16日上午起，浙江省杭州市余杭区有大量居民反映自来水出现恶臭、变色、充斥深色沉淀物等现象，部分居民表示身体不适，同时引发饮用水抢购潮[。该区的水务公司“余杭水务控股集团”7月16日深夜公告确认事件，称波及仁和与良渚两个“街道”。该公司至7月17日下午4时再发公告，称“水质经检测已恢复”，并就事件致歉，承诺每户减免5吨水费作为补偿。不过，直到7月18日近中午仍有居民反映自来水发黄。
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