fix: lower default max_slot_wal_keep_size from 4096MB to 512MB#2130
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fix: lower default max_slot_wal_keep_size from 4096MB to 512MB#2130Crispy1975 wants to merge 1 commit intodevelopfrom
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The 4096MB default exceeds the total disk size of free tier projects (2GB), risking disk exhaustion from a lagging or disconnected slot. 512MB fits safely within free tier disk overhead while still providing a reasonable buffer for logical replication slots (e.g. Realtime, CDC). WAL archiving to S3 means local retention is not needed for recovery.
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samrose
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this change isn't scoped to the free tier only, and as per my comment here https://github.com/supabase/supabase-admin-api/pull/316#pullrequestreview-4210781796, I think this affects how the replication streaming works.
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Summary
max_slot_wal_keep_sizewas set to4096MB, exceeding the total disk size of free tier projects (2GB) — a lagging or disconnected replication slot could fill the disk entirely before Postgres invalidates it512MB, which fits safely within free tier disk overheadarchive_commandmeans local WAL retention is not required for recovery, so a lower cap has no impact on PITRTest plan