[nick-potts]

Why

Ployz deploys stall for minutes after a partition heals (getployz/ployz#2925). Ployz made Corrosion's commits survive power loss by setting the inode sync flag (chattr +S) on the store, because write connections always use PRAGMA synchronous = NORMAL. That flag syncs every page write. While a healing node ingests changes, its one write connection then holds a single commit for 45 to 51 s on a slow disk. Every API write waits behind it.

synchronous = FULL gives the same guarantee, a commit durable before Corrosion broadcasts it, with one sync per commit. Measured on the same Boat sandboxes with plain SQLite WAL, 50 transactions of 200 rows:

Disk	+S, NORMAL	FULL, no +S
slow (47 ms per sync write)	209.8 s, worst commit 24.2 s	23.6 s, worst 1.77 s
normal (0.4 ms)	17.0 s, worst 0.99 s	0.54 s, worst 0.034 s

Change

[db]
synchronous = "full"   # or "normal", the default

• DbConfig.synchronous, a Synchronous enum, defaults to Normal, so a config without it behaves as before.
• rusqlite_to_crsqlite_write sets it beside cache_size. That covers the write pool and client_dedicated. Read connections and subscription databases keep NORMAL.
• SplitPool::create takes it. Test and reaper callers pass the default.
• Documented in doc/config/db.md, and listed in the README's patch table as "not offered yet". Any upstream offer goes through Nick first.

Tests

• sqlite::tests::write_connections_use_the_configured_synchronous reads PRAGMA synchronous back for each mode (1, 2).
• config::db_config_tests::synchronous_defaults_to_normal_and_reads_full covers the default and "full" parsing.
• cargo clippy --all-targets -- -D warnings and cargo fmt -- --check pass locally.

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[chatgpt-codex-connector]

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Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-10-31T00:12:02.426521Z	b4e0768	PR opened

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