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README: sizing guidance for message_retention - #95
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Explain what the retention has to cover (the slowest subscriber's polling interval, plus a margin for a reconnecting listener) and what the default costs for high-frequency broadcasts: at 60 messages per second, 1.day keeps about 5 million rows (~3.5 GB on SQLite), 5.minutes about 18,000. Measured on solid_cable 4.0.0 and 4.1.0; numbers and discussion in rails#94. Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_016abMvkfuZefDveQYGj6XN6
npezza93
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Oct 4, 2026
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Follow-up to #94 ("prs welcome for the readme update").
Two sentences:
message_retention: what the retention has to cover (the slowest subscriber's polling interval, plus a margin for a reconnecting listener) and what the default costs for frequent broadcasts — at 60 messages per second,1.daykeeps about 5 million rows (≈3.5 GB on SQLite),5.minutesabout 18,000.broadcast rate × message_retentionrows, so for frequent broadcasts the retention setting matters more than the trim batch size.Numbers measured on 4.0.0 and 4.1.0 (SQLite, one Puma process,
polling_interval0.1 s); details and raw data in #94.Closes #94
https://claude.ai/code/session_016abMvkfuZefDveQYGj6XN6