Upload a snapshot of a thumbnail shard, never the live file

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Every shard is in WAL mode and every put opens its own connection, so
while thumbnails are being generated on several threads — which is when
the first sync pass runs — the log is never checkpointed and the main
file holds whatever the last quiet moment left in it. For a shard created
seconds earlier that is nothing: a zero-byte file with the schema still
in the log. The sync read that file and uploaded it, and every other
device merging it failed with "no such table: thumbs" on every pass.

Copy the shard through SQLite's backup API into scratch first, which
serialises against writers and carries the log, and upload that.

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dtourolle

2026-09-20 00:21:14 +02:00

parent 0fa9003e54

commit 7fba28f7d8

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docs/traceability.md

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