Based on issues I'm seeing on iOS Safari, I'm guessing that my IDB caching is too aggressive and is hitting origin storage limits, which causes IDB transactions in safari to fail silently and never call any transaction callbacks (`onblocked`, `onerror`, `oncomplete`).
This is pretty bad and causes Pinafore to basically just not work unless you clear site data, which we should avoid. 2 weeks was probably unnecessary anyway; in a social network, who cares about content that's 2 weeks old?
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