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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.
This commit is contained in:
dtourolle
2026-09-20 00:21:14 +02:00
parent 0fa9003e54
commit 7fba28f7d8
4 changed files with 89 additions and 15 deletions
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docs/gestures.md
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@@ -326,7 +326,7 @@ Face indexing reads each face's eyes. The chip drops frames where the chosen peo
There is no wheel on a tablet, so without the pinch the cell size could only be changed by a control a finger cannot reach.
<sub>`ui/dr-ui/ui/library.slint:2789`</sub>
<sub>`ui/dr-ui/ui/library.slint:2795`</sub>
### File photographs in a collection
@@ -335,7 +335,7 @@ There is no wheel on a tablet, so without the pinch the cell size could only be
The selection is what the drag carries, which is why selecting several is worth the mode: forty photographs file in one gesture.
<sub>`ui/dr-ui/ui/library.slint:2986`</sub>
<sub>`ui/dr-ui/ui/library.slint:2992`</sub>
### Open a photograph
@@ -344,7 +344,7 @@ The selection is what the drag carries, which is why selecting several is worth
A tap opens; a tap that *moved* does not. Travel is what separates a deliberate tap from a hand brushing past, and it is the only thing that does: the two are the same length. An earlier version required the finger to dwell 120 ms instead, and that rejected ordinary taps — a real tap is often quicker than a brush.
<sub>`ui/dr-ui/ui/library.slint:3254`</sub>
<sub>`ui/dr-ui/ui/library.slint:3260`</sub>
### Rate a photograph without opening it
@@ -354,7 +354,7 @@ A tap opens; a tap that *moved* does not. Travel is what separates a deliberate
A star has to take the press without it also reaching the cell, or every rating throws the user into develop.
<sub>`ui/dr-ui/ui/library.slint:3374`</sub>
<sub>`ui/dr-ui/ui/library.slint:3380`</sub>
### Choose the frame a folded burst shows
@@ -363,7 +363,7 @@ A star has to take the press without it also reaching the cell, or every rating
A folded burst draws its earliest frame, which is a fact about the clock and not a judgement about the photograph — nothing in this application ranks a frame (FR-CULL-5). But the point of a burst is that one of the twelve is better than the other eleven, and the photographer is the only one who knows which. So the choice is offered on the frames themselves, while they are open and side by side, which is the one moment the alternatives are on screen to be compared.
<sub>`ui/dr-ui/ui/library.slint:3505`</sub>
<sub>`ui/dr-ui/ui/library.slint:3511`</sub>
### Drop the selection but keep selecting
@@ -372,7 +372,7 @@ A folded burst draws its earliest frame, which is a fact about the clock and not
Distinct from Done, which leaves the mode entirely. Clearing keeps it, so the next selection can start straight away.
<sub>`ui/dr-ui/ui/library.slint:4166`</sub>
<sub>`ui/dr-ui/ui/library.slint:4177`</sub>
### Select everything the grid is showing
@@ -381,7 +381,7 @@ Distinct from Done, which leaves the mode entirely. Clearing keeps it, so the ne
A scoped grid of two hundred frames is two hundred taps otherwise, and "all of them, except those three" is a far more common shape than the taps it took to say it.
<sub>`ui/dr-ui/ui/library.slint:4183`</sub>
<sub>`ui/dr-ui/ui/library.slint:4194`</sub>
### Take photographs out of a collection
@@ -390,4 +390,4 @@ A scoped grid of two hundred frames is two hundred taps otherwise, and "all of t
The badge on a cell says a photograph is filed in three collections and never which. This is the sheet that names them, and the only way out of one the grid is not currently scoped to.
<sub>`ui/dr-ui/ui/library.slint:4307`</sub>
<sub>`ui/dr-ui/ui/library.slint:4318`</sub>