Reworks S3 streaming store to be much faster and much more reliable#147

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DougReeder wants to merge 8 commits intomasterfrom

Commits on Nov 8, 2025

S3 store: folder data is calculated from S3 list and HEAD commands, then cached
DougReeder
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S3 store: caches and reads Content-Type as 0-length blob next to content blob
DougReeder
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S3 store: blocks creation of document in root folder & refactors PUT
DougReeder
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S3 store: rate of fetching metadata adjusted by how many requests are queued
DougReeder
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S3 store: waits for user bucket to exist, when creating user
DougReeder
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Modular server: improves logging
DougReeder
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Modular server: Retry-After is proportional to excess load average
DougReeder
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Modular: rate limiter allows twice as many OPTIONS requests, since they can't be authenticated
DougReeder
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