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sgx/firefly: disable btrfs CoW on Firefly III sqlite directory

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Random-write SQLite traffic fragments CoW filesystems quickly. The `h`
tmpfiles directive sets +C on the database directory; new SQLite files
(WAL, SHM, recreated main DB) inherit no-CoW automatically. No-op on
non-btrfs filesystems.

Migration of existing files must be done manually with checkpoint-first:
  systemctl stop phpfpm-firefly-iii.service
  sqlite3 .../database.sqlite 'PRAGMA wal_checkpoint(TRUNCATE);'
  # then recreate main file inside the +C dir
  systemctl start phpfpm-firefly-iii.service

Skipping the wal_checkpoint and naively deleting .sqlite-wal will lose
all writes that haven't been checkpointed (PHP-FPM SIGTERM does not
trigger a checkpoint).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
This commit is contained in:
Harald Hoyer 2026-05-01 19:31:07 +02:00
parent 81b9d2208c
commit c1503b56aa
1 changed files with 6 additions and 0 deletions
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6
systems/x86_64-linux/sgx/firefly.nix
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@ -53,6 +53,12 @@ in
"d ${inbox} 0700 firefly-iii-data-importer nginx -"
"d ${importerHome}/.aqbanking/imexporters/csv/profiles 0700 firefly-iii-data-importer nginx -"
"L+ ${importerHome}/.aqbanking/imexporters/csv/profiles/firefly.conf - - - - ${fireflyCsvProfile}"
# Disable btrfs CoW on Firefly's SQLite directory — random-write
# SQLite traffic fragments CoW filesystems quickly. New files in
# this dir inherit the +C attribute. Existing database.sqlite,
# -wal, -shm need a one-time recreate to apply (use sqlite3 .backup
# into a fresh +C file). No-op on non-btrfs filesystems.
"h /var/lib/firefly-iii/storage/database - - - - +C"
];
services.firefly-sparda-fetch = {