Merge branch 'fix/httpvfs-chunked-length'

# Conflicts:
#	web/src/lib/db-probe.test.js
#	web/src/lib/sqlite.svelte.js

assembler/internal/databases/databases.go

@@ -35,10 +35,18 @@ const driverName = "sqlite"
 // even if the row count somehow passed.
 const minSizeRatio = 0.9
 
-// Extension is the published suffix. Not ".db": keeping that name free lets
-// the site assembly treat any stray .db or SQLite journal in the output as the
-// leftover it is.
-const Extension = ".sqlite3"
+// Extension is the published suffix. The trailing 0 is a chunk index, not a
+// typo: the browser reads the file through sql.js-httpvfs in chunked mode,
+// which is the only mode whose config accepts the file's length. That mode
+// builds each request's URL as urlPrefix + chunkIndex, and one chunk holds the
+// whole database, so the index is always 0 and the prefix is "<id>.sqlite3".
+//
+// The length has to come from the config because the library otherwise takes
+// it from a HEAD request, which GitHub Pages answers with the gzipped size.
+//
+// Not ".db" either: keeping that name free lets the site assembly treat any
+// stray .db or SQLite journal in the output as the leftover it is.
+const Extension = ".sqlite30"
 
 // Paths locates the pieces this package needs.
 type Paths struct {

assembler/internal/databases/databases_test.go

@@ -12,9 +12,9 @@ import (
 func TestCleanRemovesOnlyDroppedDatasets(t *testing.T) {
 	dir := t.TempDir()
 	for _, name := range []string{
-		"2016.sqlite3", "2017.sqlite3",
-		"2017-old.sqlite3",  // dropped from the registry
-		"2017-old2.sqlite3", // dropped from the registry
+		"2016.sqlite30", "2017.sqlite30",
+		"2017-old.sqlite30",  // dropped from the registry
+		"2017-old2.sqlite30", // dropped from the registry
 		"2016.db-journal", // interrupted run
 	} {
 		if err := os.WriteFile(filepath.Join(dir, name), []byte("x"), 0o644); err != nil {
@@ -38,7 +38,7 @@ func TestCleanRemovesOnlyDroppedDatasets(t *testing.T) {
 	}
 	slices.Sort(left)
 
-	want := []string{"2016.sqlite3", "2017.sqlite3"}
+	want := []string{"2016.sqlite30", "2017.sqlite30"}
 	if !slices.Equal(left, want) {
 		t.Errorf("left %v, want %v", left, want)
 	}