fix(db): apply all migrations and schema in one transaction

This reverts commit 4459438245.

.github/workflows/build-syncthing.yaml

@@ -890,8 +890,6 @@ jobs:
       RELEASE_GENERATION: ${{ needs.facts.outputs.release-generation }}
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-
       - name: Download packages
         uses: actions/download-artifact@v4
         with:
@@ -899,14 +897,6 @@ jobs:
           path: packages
 
       # Decide whether packages should go to stable, candidate or nightly
-      - name: Prepare packages
-        run: |
-          if [[ $RELEASE_KIND == stable && $RELEASE_GENERATION == v2 ]] ; then
-            RELEASE_KIND=stable-v2
-          fi
-          mkdir -p packages/syncthing/$RELEASE_KIND
-          mv packages/*.deb packages/syncthing/$RELEASE_KIND
-
       - name: Pull archive
         uses: docker://docker.io/rclone/rclone:latest
         env:
@@ -918,15 +908,18 @@ jobs:
           RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
           RCLONE_CONFIG_OBJSTORE_ACL: public-read
         with:
-          args: sync objstore:apt/dists dists
+          args: sync objstore:apt apt
+
+      - name: Prepare packages
+        run: |
+          sudo chown -R $(id -u) apt/pool
+          mv packages/*.deb apt/pool
 
       - name: Update archive
         uses: docker://ghcr.io/kastelo/ezapt:latest
         with:
           args:
-            publish
-            --add packages
-            --dists dists
+            publish --root apt
         env:
           EZAPT_KEYRING_BASE64: ${{ secrets.APT_GPG_KEYRING_BASE64 }}
 
@@ -941,7 +934,7 @@ jobs:
           RCLONE_CONFIG_OBJSTORE_REGION: ${{ secrets.S3_REGION }}
           RCLONE_CONFIG_OBJSTORE_ACL: public-read
         with:
-          args: sync -v --no-update-modtime dists objstore:apt/dists
+          args: sync -v --no-update-modtime apt objstore:apt
 
   #
   # Build and push (except for PRs) to GHCR.

.golangci.yml

@@ -64,6 +64,12 @@ linters:
       # relax the slog rules for debug lines, for now
       - linters: [sloglint]
         source: Debug
+      # contexts are irrelevant for SQLite
+      - linters: [noctx]
+        text: database/sql
+      # Rollback errors can be ignored
+      - linters: [errcheck]
+        source: Rollback
   settings:
     sloglint:
       context: "scope"

cmd/infra/ursrv/serve/metrics.go

@@ -32,6 +32,21 @@ var (
 		Subsystem: "ursrv_v2",
 		Name:      "collect_seconds_last",
 	})
+	metricsRecalcsTotal = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "ursrv_v2",
+		Name:      "recalcs_total",
+	})
+	metricsRecalcSecondsTotal = promauto.NewCounter(prometheus.CounterOpts{
+		Namespace: "syncthing",
+		Subsystem: "ursrv_v2",
+		Name:      "recalc_seconds_total",
+	})
+	metricsRecalcSecondsLast = promauto.NewGauge(prometheus.GaugeOpts{
+		Namespace: "syncthing",
+		Subsystem: "ursrv_v2",
+		Name:      "recalc_seconds_last",
+	})
 	metricsWriteSecondsLast = promauto.NewGauge(prometheus.GaugeOpts{
 		Namespace: "syncthing",
 		Subsystem: "ursrv_v2",

cmd/infra/ursrv/serve/prometheus.go

@@ -7,6 +7,8 @@
 package serve
 
 import (
+	"context"
+	"log/slog"
 	"reflect"
 	"slices"
 	"strconv"
@@ -28,7 +30,7 @@ type metricsSet struct {
 	gaugeVecLabels map[string][]string
 	summaries      map[string]*metricSummary
 
-	collectMut    sync.Mutex
+	collectMut    sync.RWMutex
 	collectCutoff time.Duration
 }
 
@@ -108,6 +110,60 @@ func nameConstLabels(name string) (string, prometheus.Labels) {
 	return name, m
 }
 
+func (s *metricsSet) Serve(ctx context.Context) error {
+	s.recalc()
+
+	const recalcInterval = 5 * time.Minute
+	next := time.Until(time.Now().Truncate(recalcInterval).Add(recalcInterval))
+	recalcTimer := time.NewTimer(next)
+	defer recalcTimer.Stop()
+
+	for {
+		select {
+		case <-recalcTimer.C:
+			s.recalc()
+			next := time.Until(time.Now().Truncate(recalcInterval).Add(recalcInterval))
+			recalcTimer.Reset(next)
+		case <-ctx.Done():
+			return ctx.Err()
+		}
+	}
+}
+
+func (s *metricsSet) recalc() {
+	s.collectMut.Lock()
+	defer s.collectMut.Unlock()
+
+	t0 := time.Now()
+	defer func() {
+		dur := time.Since(t0)
+		slog.Info("Metrics recalculated", "d", dur.String())
+		metricsRecalcSecondsLast.Set(dur.Seconds())
+		metricsRecalcSecondsTotal.Add(dur.Seconds())
+		metricsRecalcsTotal.Inc()
+	}()
+
+	for _, g := range s.gauges {
+		g.Set(0)
+	}
+	for _, g := range s.gaugeVecs {
+		g.Reset()
+	}
+	for _, g := range s.summaries {
+		g.Reset()
+	}
+
+	cutoff := time.Now().Add(s.collectCutoff)
+	s.srv.reports.Range(func(key string, r *contract.Report) bool {
+		if s.collectCutoff < 0 && r.Received.Before(cutoff) {
+			s.srv.reports.Delete(key)
+			return true
+		}
+		s.addReport(r)
+		return true
+	})
+}
+
 func (s *metricsSet) addReport(r *contract.Report) {
 	gaugeVecs := make(map[string][]string)
 	s.addReportStruct(reflect.ValueOf(r).Elem(), gaugeVecs)
@@ -198,8 +254,8 @@ func (s *metricsSet) Describe(c chan<- *prometheus.Desc) {
 }
 
 func (s *metricsSet) Collect(c chan<- prometheus.Metric) {
-	s.collectMut.Lock()
-	defer s.collectMut.Unlock()
+	s.collectMut.RLock()
+	defer s.collectMut.RUnlock()
 
 	t0 := time.Now()
 	defer func() {
@@ -209,26 +265,6 @@ func (s *metricsSet) Collect(c chan<- prometheus.Metric) {
 		metricsCollectsTotal.Inc()
 	}()
 
-	for _, g := range s.gauges {
-		g.Set(0)
-	}
-	for _, g := range s.gaugeVecs {
-		g.Reset()
-	}
-	for _, g := range s.summaries {
-		g.Reset()
-	}
-
-	cutoff := time.Now().Add(s.collectCutoff)
-	s.srv.reports.Range(func(key string, r *contract.Report) bool {
-		if s.collectCutoff < 0 && r.Received.Before(cutoff) {
-			s.srv.reports.Delete(key)
-			return true
-		}
-		s.addReport(r)
-		return true
-	})
-
 	for _, g := range s.gauges {
 		c <- g
 	}

cmd/infra/ursrv/serve/serve.go

@@ -33,6 +33,7 @@ import (
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/geoip"
 	"github.com/syncthing/syncthing/lib/ur/contract"
+	"github.com/thejerf/suture/v4"
 )
 
 type CLI struct {
@@ -187,7 +188,12 @@ func (cli *CLI) Run() error {
 	// New external metrics endpoint accepts reports from clients and serves
 	// aggregated usage reporting metrics.
 
+	main := suture.NewSimple("main")
+	main.ServeBackground(context.Background())
+
 	ms := newMetricsSet(srv)
+	main.Add(ms)
+
 	reg := prometheus.NewRegistry()
 	reg.MustRegister(ms)
 
@@ -198,7 +204,7 @@ func (cli *CLI) Run() error {
 
 	metricsSrv := http.Server{
 		ReadTimeout:  5 * time.Second,
-		WriteTimeout: 15 * time.Second,
+		WriteTimeout: 60 * time.Second,
 		Handler:      mux,
 	}
 
@@ -227,6 +233,11 @@ func (cli *CLI) downloadDumpFile(blobs blob.Store) error {
 }
 
 func (cli *CLI) saveDumpFile(srv *server, blobs blob.Store) error {
+	t0 := time.Now()
+	defer func() {
+		metricsWriteSecondsLast.Set(float64(time.Since(t0)))
+	}()
+
 	fd, err := os.Create(cli.DumpFile + ".tmp")
 	if err != nil {
 		return fmt.Errorf("creating dump file: %w", err)
@@ -245,9 +256,10 @@ func (cli *CLI) saveDumpFile(srv *server, blobs blob.Store) error {
 	if err := os.Rename(cli.DumpFile+".tmp", cli.DumpFile); err != nil {
 		return fmt.Errorf("renaming dump file: %w", err)
 	}
-	slog.Info("Dump file saved")
+	slog.Info("Dump file saved", "d", time.Since(t0).String())
 
 	if blobs != nil {
+		t1 := time.Now()
 		key := fmt.Sprintf("reports-%s.jsons.gz", time.Now().UTC().Format("2006-01-02"))
 		fd, err := os.Open(cli.DumpFile)
 		if err != nil {
@@ -257,7 +269,7 @@ func (cli *CLI) saveDumpFile(srv *server, blobs blob.Store) error {
 			return fmt.Errorf("uploading dump file: %w", err)
 		}
 		_ = fd.Close()
-		slog.Info("Dump file uploaded")
+		slog.Info("Dump file uploaded", "d", time.Since(t1).String())
 	}
 
 	return nil
@@ -369,6 +381,13 @@ func (s *server) addReport(rep *contract.Report) bool {
 	rep.DistOS = rep.OS
 	rep.DistArch = rep.Arch
 
+	if strings.HasPrefix(rep.Version, "v2.") {
+		rep.Database.ModernCSQLite = strings.Contains(rep.LongVersion, "modernc-sqlite")
+		rep.Database.MattnSQLite = !rep.Database.ModernCSQLite
+	} else {
+		rep.Database.LevelDB = true
+	}
+
 	_, loaded := s.reports.LoadAndStore(rep.UniqueID, rep)
 	return loaded
 }
@@ -388,6 +407,7 @@ func (s *server) save(w io.Writer) error {
 }
 
 func (s *server) load(r io.Reader) {
+	t0 := time.Now()
 	dec := json.NewDecoder(r)
 	s.reports.Clear()
 	for {
@@ -400,7 +420,7 @@ func (s *server) load(r io.Reader) {
 		}
 		s.addReport(&rep)
 	}
-	slog.Info("Loaded reports", "count", s.reports.Size())
+	slog.Info("Loaded reports", "count", s.reports.Size(), "d", time.Since(t0).String())
 }
 
 var (

cmd/syncthing/main.go

@@ -122,9 +122,10 @@ type CLI struct {
 	// subcommands. Their settings take effect on the `locations` package by
 	// way of the command line parser, so anything using `locations.Get` etc
 	// will be doing the right thing.
-	ConfDir string `name:"config" short:"C" placeholder:"PATH" env:"STCONFDIR" help:"Set configuration directory (config and keys)"`
-	DataDir string `name:"data" short:"D" placeholder:"PATH" env:"STDATADIR" help:"Set data directory (database and logs)"`
-	HomeDir string `name:"home" short:"H" placeholder:"PATH" env:"STHOMEDIR" help:"Set configuration and data directory"`
+	ConfDir     string `name:"config" short:"C" placeholder:"PATH" env:"STCONFDIR" help:"Set configuration directory (config and keys)"`
+	DataDir     string `name:"data" short:"D" placeholder:"PATH" env:"STDATADIR" help:"Set data directory (database and logs)"`
+	HomeDir     string `name:"home" short:"H" placeholder:"PATH" env:"STHOMEDIR" help:"Set configuration and data directory"`
+	VersionFlag bool   `name:"version" help:"Show current version, then exit"`
 
 	Serve serveCmd `cmd:"" help:"Run Syncthing (default)" default:"withargs"`
 	CLI   cli.CLI  `cmd:"" help:"Command line interface for Syncthing"`
@@ -224,6 +225,12 @@ func main() {
 	kongplete.Complete(parser)
 	ctx, err := parser.Parse(os.Args[1:])
 	parser.FatalIfErrorf(err)
+
+	if entrypoint.VersionFlag {
+		_ = versionCmd{}.Run()
+		return
+	}
+
 	err = ctx.Run()
 	parser.FatalIfErrorf(err)
 }
@@ -472,7 +479,11 @@ func (c *serveCmd) syncthingMain() {
 		})
 	}
 
-	if err := syncthing.TryMigrateDatabase(c.DBDeleteRetentionInterval); err != nil {
+	var tempApiAddress string
+	if cfgWrapper.GUI().Enabled {
+		tempApiAddress = cfgWrapper.GUI().Address()
+	}
+	if err := syncthing.TryMigrateDatabase(ctx, c.DBDeleteRetentionInterval, tempApiAddress); err != nil {
 		slog.Error("Failed to migrate old-style database", slogutil.Error(err))
 		os.Exit(1)
 	}

go.mod

@@ -24,7 +24,6 @@ require (
 	github.com/kballard/go-shellquote v0.0.0-20180428030007-95032a82bc51
 	github.com/maruel/panicparse/v2 v2.5.0
 	github.com/mattn/go-sqlite3 v1.14.31
-	github.com/maxbrunsfeld/counterfeiter/v6 v6.11.3
 	github.com/maxmind/geoipupdate/v6 v6.1.0
 	github.com/miscreant/miscreant.go v0.0.0-20200214223636-26d376326b75
 	github.com/oschwald/geoip2-golang v1.13.0
@@ -34,7 +33,7 @@ require (
 	github.com/quic-go/quic-go v0.52.0
 	github.com/rabbitmq/amqp091-go v1.10.0
 	github.com/rcrowley/go-metrics v0.0.0-20250401214520-65e299d6c5c9
-	github.com/shirou/gopsutil/v4 v4.25.7
+	github.com/shirou/gopsutil/v4 v4.25.6 // https://github.com/shirou/gopsutil/issues/1898
 	github.com/syncthing/notify v0.0.0-20250528144937-c7027d4f7465
 	github.com/syndtr/goleveldb v1.0.1-0.20220721030215-126854af5e6d
 	github.com/thejerf/suture/v4 v4.0.6
@@ -49,7 +48,6 @@ require (
 	golang.org/x/sys v0.35.0
 	golang.org/x/text v0.28.0
 	golang.org/x/time v0.12.0
-	golang.org/x/tools v0.36.0
 	google.golang.org/protobuf v1.36.7
 	modernc.org/sqlite v1.38.2
 	sigs.k8s.io/yaml v1.6.0
@@ -79,6 +77,7 @@ require (
 	github.com/jmespath/go-jmespath v0.4.0 // indirect
 	github.com/lufia/plan9stats v0.0.0-20240909124753-873cd0166683 // indirect
 	github.com/mattn/go-isatty v0.0.20 // indirect
+	github.com/maxbrunsfeld/counterfeiter/v6 v6.11.3 // indirect
 	github.com/munnerz/goautoneg v0.0.0-20191010083416-a7dc8b61c822 // indirect
 	github.com/ncruces/go-strftime v0.1.9 // indirect
 	github.com/nxadm/tail v1.4.11 // indirect
@@ -103,6 +102,7 @@ require (
 	go.yaml.in/yaml/v2 v2.4.2 // indirect
 	golang.org/x/mod v0.27.0 // indirect
 	golang.org/x/sync v0.16.0 // indirect
+	golang.org/x/tools v0.36.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 	modernc.org/libc v1.66.3 // indirect
 	modernc.org/mathutil v1.7.1 // indirect
@@ -114,3 +114,9 @@ replace github.com/gobwas/glob v0.2.3 => github.com/calmh/glob v0.0.0-2022061508
 
 // https://github.com/mattn/go-sqlite3/pull/1338
 replace github.com/mattn/go-sqlite3 v1.14.31 => github.com/calmh/go-sqlite3 v1.14.32-0.20250812195006-80712c77b76a
+
+tool (
+	github.com/calmh/xdr/cmd/genxdr
+	github.com/maxbrunsfeld/counterfeiter/v6
+	golang.org/x/tools/cmd/goimports
+)

go.sum

@@ -240,8 +240,8 @@ github.com/russross/blackfriday/v2 v2.1.0 h1:JIOH55/0cWyOuilr9/qlrm0BSXldqnqwMsf
 github.com/russross/blackfriday/v2 v2.1.0/go.mod h1:+Rmxgy9KzJVeS9/2gXHxylqXiyQDYRxCVz55jmeOWTM=
 github.com/sclevine/spec v1.4.0 h1:z/Q9idDcay5m5irkZ28M7PtQM4aOISzOpj4bUPkDee8=
 github.com/sclevine/spec v1.4.0/go.mod h1:LvpgJaFyvQzRvc1kaDs0bulYwzC70PbiYjC4QnFHkOM=
-github.com/shirou/gopsutil/v4 v4.25.7 h1:bNb2JuqKuAu3tRlPv5piSmBZyMfecwQ+t/ILq+1JqVM=
-github.com/shirou/gopsutil/v4 v4.25.7/go.mod h1:XV/egmwJtd3ZQjBpJVY5kndsiOO4IRqy9TQnmm6VP7U=
+github.com/shirou/gopsutil/v4 v4.25.6 h1:kLysI2JsKorfaFPcYmcJqbzROzsBWEOAtw6A7dIfqXs=
+github.com/shirou/gopsutil/v4 v4.25.6/go.mod h1:PfybzyydfZcN+JMMjkF6Zb8Mq1A/VcogFFg7hj50W9c=
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/objx v0.4.0/go.mod h1:YvHI0jy2hoMjB+UWwv71VJQ9isScKT/TqJzVSSt89Yw=
 github.com/stretchr/objx v0.5.0/go.mod h1:Yh+to48EsGEfYuaHDzXPcE3xhTkx73EhmCGUpEOglKo=

gui/default/assets/lang/lang-de.json

@@ -61,7 +61,7 @@
     "Click to see full identification string and QR code.": "Klicken, um die vollständige Kennung und den QR-Code anzuzeigen.",
     "Close": "Schließen",
     "Command": "Befehl",
-    "Comment, when used at the start of a line": "Kommentar, wenn am Anfang der Zeile verwendet.",
+    "Comment, when used at the start of a line": "Kommentar, wenn am Anfang der Zeile verwendet",
     "Compression": "Komprimierung",
     "Configuration Directory": "Konfigurationsverzeichnis",
     "Configuration File": "Konfigurationsdatei",
@@ -82,6 +82,7 @@
     "Custom Range": "Eigener Zeitraum",
     "Danger!": "Achtung!",
     "Database Location": "Datenbank-Speicherort",
+    "Debug": "Debug",
     "Debugging Facilities": "Debugging-Möglichkeiten",
     "Default": "Vorgabe",
     "Default Configuration": "Vorgabekonfiguration",
@@ -104,7 +105,7 @@
     "Device Status": "Gerätestatus",
     "Device is untrusted, enter encryption password": "Gerät wird nicht vertraut, Verschlüsselungspasswort eingeben",
     "Device rate limits": "Datenratenbegrenzungen fürs Gerät",
-    "Device that last modified the item": "Gerät, das das Element zuletzt geändert hat",
+    "Device that last modified the item": "Gerät, welches das Element zuletzt geändert hat",
     "Devices": "Geräte",
     "Disable Crash Reporting": "Absturzmeldung deaktivieren",
     "Disabled": "Deaktiviert",
@@ -183,7 +184,7 @@
     "GUI / API HTTPS Certificate": "GUI / API HTTPS-Zertifikat",
     "GUI Authentication Password": "Passwort für Zugang zur Benutzeroberfläche",
     "GUI Authentication User": "Benutzername für Zugang zur Benutzeroberfläche",
-    "GUI Authentication: Set User and Password": "Authentifizierung für die Benutzeroberfläche: Geben Sie Benutzer und Passwort ein.",
+    "GUI Authentication: Set User and Password": "Authentifizierung für die Benutzeroberfläche: Geben Sie Benutzer und Passwort ein",
     "GUI Listen Address": "Adresse der Benutzeroberfläche",
     "GUI Override Directory": "GUI-Ersatz-Verzeichnis",
     "GUI Theme": "GUI-Design",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Eingehende Datenratenbegrenzung (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Eine falsche Konfiguration kann den Ordnerinhalt beschädigen und Syncthing in einen unausführbaren Zustand versetzen.",
     "Incorrect user name or password.": "Falscher Benutzername oder Passwort.",
+    "Info": "Info",
     "Internally used paths:": "Intern verwendete Pfade:",
     "Introduced By": "Verteilt von",
     "Introducer": "Verteilergerät",

gui/default/assets/lang/lang-fil.json

@@ -82,6 +82,7 @@
     "Custom Range": "Custom na Saklaw",
     "Danger!": "Panganib!",
     "Database Location": "Lokasyon ng Database",
+    "Debug": "Debug",
     "Debugging Facilities": "Mga Facility ng Pag-debug",
     "Default": "Default",
     "Default Configuration": "Default na Configuration",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Rate Limit ng Papasok (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Maaring sirain ng maling pagsasaayos ang nilalaman ng iyong mga folder at gawing inoperable ang Syncthing.",
     "Incorrect user name or password.": "Maling user name o password.",
+    "Info": "Impormasyon",
     "Internally used paths:": "Mga internal na ginamit na path:",
     "Introduced By": "Ipinakilala Ni/Ng",
     "Introducer": "Tagapagpakilala",
@@ -227,6 +229,7 @@
     "Learn more": "Matuto pa",
     "Learn more at {%url%}": "Matuto pa sa {{url}}",
     "Limit": "Limitasyon",
+    "Limit Bandwidth in LAN": "Limitahan ang Bandwidth sa LAN",
     "Listener Failures": "Mga Pagbibigo ng Listener",
     "Listener Status": "Status ng Listener",
     "Listeners": "Mga Listener",

gui/default/assets/lang/lang-fr.json

@@ -82,6 +82,7 @@
     "Custom Range": "Plage personnalisée",
     "Danger!": "Attention !",
     "Database Location": "Emplacement de la base de données",
+    "Debug": "Débogage",
     "Debugging Facilities": "Outils de débogage",
     "Default": "Par défaut",
     "Default Configuration": "Préférences pour les créations (non rétroactif)",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Limite du débit de réception (Kio/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Une configuration incorrecte peut créer des dommages dans vos répertoires et mettre Syncthing hors-service.",
     "Incorrect user name or password.": "Nom d'utilisateur ou mot de passe incorrect.",
+    "Info": "Informations",
     "Internally used paths:": "Chemins utilisés en interne :",
     "Introduced By": "Introduit par",
     "Introducer": "Appareil introducteur",
@@ -322,7 +324,7 @@
     "Release candidates contain the latest features and fixes. They are similar to the traditional bi-weekly Syncthing releases.": "Les versions préliminaires contiennent les dernières fonctionnalités et derniers correctifs. Elles sont identiques aux traditionnelles mises à jour bimensuelles.",
     "Remote Devices": "Autres appareils",
     "Remote GUI": "IHM distant",
-    "Remove": "Supprimer",
+    "Remove": "Enlever",
     "Remove Device": "Supprimer l'appareil",
     "Remove Folder": "Supprimer le partage",
     "Required identifier for the folder. Must be the same on all cluster devices.": "Identifiant du partage. Doit être le même sur tous les appareils concernés (généré aléatoirement, mais modifiable à la création, par exemple pour faire entrer un appareil dans un partage pré-existant actuellement non connecté mais dont on connaît déjà l'ID, ou s'il n'y a personne à l'autre bout pour vous inviter à y participer).",

gui/default/assets/lang/lang-ga.json

@@ -82,6 +82,7 @@
     "Custom Range": "Raon Saincheaptha",
     "Danger!": "Contúirt!",
     "Database Location": "Suíomh an Bhunachair Sonraí",
+    "Debug": "Dífhabhtú",
     "Debugging Facilities": "Áiseanna Dífhabhtaithe",
     "Default": "Réamhshocrú",
     "Default Configuration": "Cumraíocht Réamhshocraithe",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Teorainn Ráta Isteach (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "D'fhéadfadh cumraíocht mhícheart dochar a dhéanamh d'inneachar d'fhillteáin agus sioncronú a dhéanamh do-oibrithe.",
     "Incorrect user name or password.": "Ainm úsáideora nó pasfhocal mícheart.",
+    "Info": "Eolas",
     "Internally used paths:": "Cosáin a úsáidtear go hinmheánach:",
     "Introduced By": "Tugtha isteach ag",
     "Introducer": "Réamhrá",

gui/default/assets/lang/lang-ko-KR.json

@@ -82,6 +82,7 @@
     "Custom Range": "사용자 설정 기간",
     "Danger!": "위험!",
     "Database Location": "데이터베이스 위치",
+    "Debug": "디버그",
     "Debugging Facilities": "디버그 기능",
     "Default": "기본값",
     "Default Configuration": "기본 설정",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "수신 속도 제한(KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "잘못된 설정은 폴더의 내용을 훼손하거나 Syncthing을 작동하지 못하게 할 수 있습니다.",
     "Incorrect user name or password.": "사용자 또는 비밀번호가 올바르지 않습니다.",
+    "Info": "정보",
     "Internally used paths:": "내부적으로 사용되는 경로:",
     "Introduced By": "소개한 기기",
     "Introducer": "소개자",

gui/default/assets/lang/lang-nl.json

@@ -82,6 +82,7 @@
     "Custom Range": "Aangepast bereik",
     "Danger!": "Let op!",
     "Database Location": "Locatie van database",
+    "Debug": "Debuggen",
     "Debugging Facilities": "Debugmogelijkheden",
     "Default": "Standaard",
     "Default Configuration": "Standaardconfiguratie",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Begrenzing downloadsnelheid (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Verkeerde configuratie kan de inhoud van je map beschadigen en Syncthing onbruikbaar maken.",
     "Incorrect user name or password.": "Onjuiste gebruikersnaam of wachtwoord.",
+    "Info": "Info",
     "Internally used paths:": "Intern gebruikte paden:",
     "Introduced By": "Geïntroduceerd door",
     "Introducer": "Introductie-apparaat",

gui/default/assets/lang/lang-pl.json

@@ -82,6 +82,7 @@
     "Custom Range": "Niestandardowy okres",
     "Danger!": "Niebezpieczeństwo!",
     "Database Location": "Miejsce przechowywania bazy danych",
+    "Debug": "Diagnozowanie błędów",
     "Debugging Facilities": "Narzędzia do debugowania",
     "Default": "Domyślnie",
     "Default Configuration": "Domyślne ustawienia",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Ograniczenie prędkości pobierania (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Niepoprawne ustawienia mogą uszkodzić zawartość folderów oraz sprawić, że Syncthing przestanie działać.",
     "Incorrect user name or password.": "Nieprawidłowa nazwa użytkownika lub hasło.",
+    "Info": "Informacje",
     "Internally used paths:": "Ścieżki używane wewnętrznie:",
     "Introduced By": "Wprowadzony przez",
     "Introducer": "Wprowadzający",

gui/default/assets/lang/lang-pt-BR.json

@@ -82,6 +82,7 @@
     "Custom Range": "Intervalo de tempo",
     "Danger!": "Perigo!",
     "Database Location": "Localização do banco de dados",
+    "Debug": "Depuração",
     "Debugging Facilities": "Facilidades de depuração",
     "Default": "Padrão",
     "Default Configuration": "Configuração Padrão",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Limite de velocidade de recepção (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "A configuração incorreta poderá causar danos aos seus dados e tornar o Syncthing inoperante.",
     "Incorrect user name or password.": "Nome de usuário ou senha incorretos.",
+    "Info": "Informações",
     "Internally used paths:": "Caminhos usados internamente:",
     "Introduced By": "Introduzido por",
     "Introducer": "Apresentador",
@@ -227,6 +229,7 @@
     "Learn more": "Saiba mais",
     "Learn more at {%url%}": "Saiba mais em {{url}}",
     "Limit": "Limite",
+    "Limit Bandwidth in LAN": "Limitar largura de banda na LAN",
     "Listener Failures": "Falhas de Escuta",
     "Listener Status": "Status da Escuta",
     "Listeners": "Escutadores",

gui/default/assets/lang/lang-sv.json

@@ -82,6 +82,7 @@
     "Custom Range": "Anpassat intervall",
     "Danger!": "Fara!",
     "Database Location": "Databasplats",
+    "Debug": "Felsökning",
     "Debugging Facilities": "Felsökningsfunktioner",
     "Default": "Standard",
     "Default Configuration": "Standardkonfiguration",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Ingående hastighetsgräns (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Inkorrekt konfiguration kan skada innehållet i mappen och få Syncthing att sluta fungera.",
     "Incorrect user name or password.": "Felaktigt användarnamn eller lösenord.",
+    "Info": "Info",
     "Internally used paths:": "Internt använda sökvägar:",
     "Introduced By": "Introducerad av",
     "Introducer": "Introduktör",

gui/default/assets/lang/lang-tr.json

@@ -82,6 +82,7 @@
     "Custom Range": "Özel Aralık",
     "Danger!": "Tehlike!",
     "Database Location": "Veritabanı Konumu",
+    "Debug": "Hata Ayıklama",
     "Debugging Facilities": "Hata Ayıklama Olanakları",
     "Default": "Varsayılan",
     "Default Configuration": "Varsayılan Yapılandırma",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "Gelen Hız Sınırı (KiB/s)",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "Yanlış yapılandırma klasör içeriklerinize zarar verebilir ve Syncthing'i çalışamaz hale getirebilir.",
     "Incorrect user name or password.": "Yanlış kullanıcı adı ya da parola.",
+    "Info": "Bilgi",
     "Internally used paths:": "Dahili olarak kullanılan yollar:",
     "Introduced By": "Tanıtan",
     "Introducer": "Tanıtıcı",

gui/default/assets/lang/lang-zh-CN.json

@@ -82,6 +82,7 @@
     "Custom Range": "自定义范围",
     "Danger!": "危险！",
     "Database Location": "数据库位置",
+    "Debug": "调试",
     "Debugging Facilities": "调试功能",
     "Default": "默认",
     "Default Configuration": "默认配置",
@@ -210,6 +211,7 @@
     "Incoming Rate Limit (KiB/s)": "传入速率限制（KiB/s）",
     "Incorrect configuration may damage your folder contents and render Syncthing inoperable.": "不正确的配置可能会损坏您的文件夹内容，并导致 Syncthing 无法运行。",
     "Incorrect user name or password.": "用户名或密码不正确。",
+    "Info": "信息",
     "Internally used paths:": "内部使用的路径：",
     "Introduced By": "介绍自",
     "Introducer": "作为中介",

gui/default/syncthing/device/editDeviceModalView.html

@@ -159,7 +159,7 @@
                   <div class="row">
                     <span class="col-md-8" translate>Incoming Rate Limit (KiB/s)</span>
                     <div class="col-md-4">
-                      <input name="maxRecvKbps" id="maxRecvKbps" class="form-control" type="number" pattern="\d+" ng-model="currentDevice.maxRecvKbps" min="0" />
+                      <input name="maxRecvKbps" id="maxRecvKbps" class="form-control" type="number" pattern="\d+" ng-model="currentDevice.maxRecvKbps" min="0" step="1024" />
                     </div>
                   </div>
                   <p class="help-block" ng-if="!deviceEditor.maxRecvKbps.$valid && deviceEditor.maxRecvKbps.$dirty" translate>The rate limit must be a non-negative number (0: no limit)</p>
@@ -168,7 +168,7 @@
                   <div class="row">
                     <span class="col-md-8" translate>Outgoing Rate Limit (KiB/s)</span>
                     <div class="col-md-4">
-                      <input name="maxSendKbps" id="maxSendKbps" class="form-control" type="number" pattern="\d+" ng-model="currentDevice.maxSendKbps" min="0" />
+                      <input name="maxSendKbps" id="maxSendKbps" class="form-control" type="number" pattern="\d+" ng-model="currentDevice.maxSendKbps" min="0" step="1024" />
                     </div>
                   </div>
                   <p class="help-block" ng-if="!deviceEditor.maxSendKbps.$valid && deviceEditor.maxSendKbps.$dirty" translate>The rate limit must be a non-negative number (0: no limit)</p>

gui/default/syncthing/folder/editFolderModalView.html

@@ -146,7 +146,7 @@
           <div class="form-group" ng-if="internalVersioningEnabled()" ng-class="{'has-error': folderEditor.cleanupIntervalS.$invalid && folderEditor.cleanupIntervalS.$dirty}">
             <label translate for="cleanupIntervalS">Cleanup Interval</label>
             <div class="input-group">
-              <input name="cleanupIntervalS" id="cleanupIntervalS" class="form-control text-right" type="number" ng-model="currentFolder._guiVersioning.cleanupIntervalS" required="" min="0" max="31536000" aria-required="true" />
+              <input name="cleanupIntervalS" id="cleanupIntervalS" class="form-control text-right" type="number" ng-model="currentFolder._guiVersioning.cleanupIntervalS" required="" min="0" max="31536000" step="3600" aria-required="true" />
               <div class="input-group-addon" translate>seconds</div>
             </div>
             <p class="help-block">

gui/default/syncthing/settings/settingsModalView.html

@@ -194,7 +194,7 @@
             <div class="col-md-6">
               <div class="form-group" ng-class="{'has-error': settingsEditor.MaxRecvKbps.$invalid && settingsEditor.MaxRecvKbps.$dirty}">
                 <label translate for="MaxRecvKbps">Incoming Rate Limit (KiB/s)</label>
-                <input id="MaxRecvKbps" name="MaxRecvKbps" class="form-control" type="number" ng-model="tmpOptions.maxRecvKbps" min="0" />
+                <input id="MaxRecvKbps" name="MaxRecvKbps" class="form-control" type="number" ng-model="tmpOptions.maxRecvKbps" min="0" step="1024" />
                 <p class="help-block">
                   <span translate ng-if="settingsEditor.MaxRecvKbps.$error.min && settingsEditor.MaxRecvKbps.$dirty">The rate limit must be a non-negative number (0: no limit)</span>
                 </p>
@@ -203,7 +203,7 @@
             <div class="col-md-6">
               <div class="form-group" ng-class="{'has-error': settingsEditor.MaxSendKbps.$invalid && settingsEditor.MaxSendKbps.$dirty}">
                 <label translate for="MaxSendKbps">Outgoing Rate Limit (KiB/s)</label>
-                <input id="MaxSendKbps" name="MaxSendKbps" class="form-control" type="number" ng-model="tmpOptions.maxSendKbps" min="0" />
+                <input id="MaxSendKbps" name="MaxSendKbps" class="form-control" type="number" ng-model="tmpOptions.maxSendKbps" min="0" step="1024" />
                 <p class="help-block">
                   <span translate ng-if="settingsEditor.MaxSendKbps.$error.min && settingsEditor.MaxSendKbps.$dirty">The rate limit must be a non-negative number (0: no limit)</span>
                 </p>

internal/db/sqlite/basedb.go

@@ -10,6 +10,7 @@ import (
 	"database/sql"
 	"embed"
 	"io/fs"
+	"log/slog"
 	"net/url"
 	"path/filepath"
 	"strconv"
@@ -19,11 +20,12 @@ import (
 	"time"
 
 	"github.com/jmoiron/sqlx"
+	"github.com/syncthing/syncthing/internal/slogutil"
 	"github.com/syncthing/syncthing/lib/build"
 	"github.com/syncthing/syncthing/lib/protocol"
 )
 
-const currentSchemaVersion = 3
+const currentSchemaVersion = 4
 
 //go:embed sql/**
 var embedded embed.FS
@@ -81,13 +83,20 @@ func openBase(path string, maxConns int, pragmas, schemaScripts, migrationScript
 		},
 	}
 
+	tx, err := db.sql.Beginx()
+	if err != nil {
+		return nil, wrap(err)
+	}
+	defer tx.Rollback()
+
 	for _, script := range schemaScripts {
-		if err := db.runScripts(script); err != nil {
+		if err := db.runScripts(tx, script); err != nil {
 			return nil, wrap(err)
 		}
 	}
 
-	ver, _ := db.getAppliedSchemaVersion()
+	ver, _ := db.getAppliedSchemaVersion(tx)
+	shouldVacuum := false
 	if ver.SchemaVersion > 0 {
 		filter := func(scr string) bool {
 			scr = filepath.Base(scr)
@@ -99,20 +108,37 @@ func openBase(path string, maxConns int, pragmas, schemaScripts, migrationScript
 			if err != nil {
 				return false
 			}
-			return int(n) > ver.SchemaVersion
+			if int(n) > ver.SchemaVersion {
+				slog.Info("Applying database migration", slogutil.FilePath(db.baseName), slog.String("script", scr))
+				return true
+			}
+			return false
 		}
 		for _, script := range migrationScripts {
-			if err := db.runScripts(script, filter); err != nil {
+			if err := db.runScripts(tx, script, filter); err != nil {
 				return nil, wrap(err)
 			}
+			shouldVacuum = true
 		}
 	}
 
 	// Set the current schema version, if not already set
-	if err := db.setAppliedSchemaVersion(currentSchemaVersion); err != nil {
+	if err := db.setAppliedSchemaVersion(tx, currentSchemaVersion); err != nil {
 		return nil, wrap(err)
 	}
 
+	if err := tx.Commit(); err != nil {
+		return nil, wrap(err)
+	}
+
+	if shouldVacuum {
+		// We applied migrations and should take the opportunity to vaccuum
+		// the database.
+		if err := db.vacuumAndOptimize(); err != nil {
+			return nil, wrap(err)
+		}
+	}
+
 	return db, nil
 }
 
@@ -188,6 +214,20 @@ func (s *baseDB) expandTemplateVars(tpl string) string {
 	return sb.String()
 }
 
+func (s *baseDB) vacuumAndOptimize() error {
+	stmts := []string{
+		"VACUUM;",
+		"PRAGMA optimize;",
+		"PRAGMA wal_checkpoint(truncate);",
+	}
+	for _, stmt := range stmts {
+		if _, err := s.sql.Exec(stmt); err != nil {
+			return wrap(err, stmt)
+		}
+	}
+	return nil
+}
+
 type stmt interface {
 	Exec(args ...any) (sql.Result, error)
 	Get(dest any, args ...any) error
@@ -204,18 +244,12 @@ func (f failedStmt) Get(_ any, _ ...any) error           { return f.err }
 func (f failedStmt) Queryx(_ ...any) (*sqlx.Rows, error) { return nil, f.err }
 func (f failedStmt) Select(_ any, _ ...any) error        { return f.err }
 
-func (s *baseDB) runScripts(glob string, filter ...func(s string) bool) error {
+func (s *baseDB) runScripts(tx *sqlx.Tx, glob string, filter ...func(s string) bool) error {
 	scripts, err := fs.Glob(embedded, glob)
 	if err != nil {
 		return wrap(err)
 	}
 
-	tx, err := s.sql.Begin()
-	if err != nil {
-		return wrap(err)
-	}
-	defer tx.Rollback() //nolint:errcheck
-
 nextScript:
 	for _, scr := range scripts {
 		for _, fn := range filter {
@@ -238,7 +272,7 @@ nextScript:
 		}
 	}
 
-	return wrap(tx.Commit())
+	return nil
 }
 
 type schemaVersion struct {
@@ -251,20 +285,20 @@ func (s *schemaVersion) AppliedTime() time.Time {
 	return time.Unix(0, s.AppliedAt)
 }
 
-func (s *baseDB) setAppliedSchemaVersion(ver int) error {
-	_, err := s.stmt(`
+func (s *baseDB) setAppliedSchemaVersion(tx *sqlx.Tx, ver int) error {
+	_, err := tx.Exec(`
 		INSERT OR IGNORE INTO schemamigrations (schema_version, applied_at, syncthing_version)
 		VALUES (?, ?, ?)
-	`).Exec(ver, time.Now().UnixNano(), build.LongVersion)
+	`, ver, time.Now().UnixNano(), build.LongVersion)
 	return wrap(err)
 }
 
-func (s *baseDB) getAppliedSchemaVersion() (schemaVersion, error) {
+func (s *baseDB) getAppliedSchemaVersion(tx *sqlx.Tx) (schemaVersion, error) {
 	var v schemaVersion
-	err := s.stmt(`
+	err := tx.Get(&v, `
 		SELECT schema_version as schemaversion, applied_at as appliedat, syncthing_version as syncthingversion FROM schemamigrations
 		ORDER BY schema_version DESC
 		LIMIT 1
-	`).Get(&v)
+	`)
 	return v, wrap(err)
 }

internal/db/sqlite/db_bench_test.go

@@ -7,7 +7,6 @@
 package sqlite
 
 import (
-	"context"
 	"fmt"
 	"testing"
 	"time"
@@ -21,7 +20,7 @@ import (
 var globalFi protocol.FileInfo
 
 func BenchmarkUpdate(b *testing.B) {
-	db, err := OpenTemp()
+	db, err := Open(b.TempDir())
 	if err != nil {
 		b.Fatal(err)
 	}
@@ -30,19 +29,20 @@ func BenchmarkUpdate(b *testing.B) {
 			b.Fatal(err)
 		}
 	})
-	svc := db.Service(time.Hour).(*Service)
 
 	fs := make([]protocol.FileInfo, 100)
+	t0 := time.Now()
+
 	seed := 0
+	size := 1000
+	const numBlocks = 500
+
+	fdb, err := db.getFolderDB(folderID, true)
+	if err != nil {
+		b.Fatal(err)
+	}
 
-	size := 10000
 	for size < 200_000 {
-		t0 := time.Now()
-		if err := svc.periodic(context.Background()); err != nil {
-			b.Fatal(err)
-		}
-		b.Log("garbage collect in", time.Since(t0))
-
 		for {
 			local, err := db.CountLocal(folderID, protocol.LocalDeviceID)
 			if err != nil {
@@ -53,17 +53,28 @@ func BenchmarkUpdate(b *testing.B) {
 			}
 			fs := make([]protocol.FileInfo, 1000)
 			for i := range fs {
-				fs[i] = genFile(rand.String(24), 64, 0)
+				fs[i] = genFile(rand.String(24), numBlocks, 0)
 			}
 			if err := db.Update(folderID, protocol.LocalDeviceID, fs); err != nil {
 				b.Fatal(err)
 			}
 		}
 
-		b.Run(fmt.Sprintf("Insert100Loc@%d", size), func(b *testing.B) {
+		var files, blocks int
+		if err := fdb.sql.QueryRowx(`SELECT count(*) FROM files`).Scan(&files); err != nil {
+			b.Fatal(err)
+		}
+		if err := fdb.sql.QueryRowx(`SELECT count(*) FROM blocks`).Scan(&blocks); err != nil {
+			b.Fatal(err)
+		}
+
+		d := time.Since(t0)
+		b.Logf("t=%s, files=%d, blocks=%d, files/s=%.01f, blocks/s=%.01f", d, files, blocks, float64(files)/d.Seconds(), float64(blocks)/d.Seconds())
+
+		b.Run(fmt.Sprintf("n=Insert100Loc/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				for i := range fs {
-					fs[i] = genFile(rand.String(24), 64, 0)
+					fs[i] = genFile(rand.String(24), numBlocks, 0)
 				}
 				if err := db.Update(folderID, protocol.LocalDeviceID, fs); err != nil {
 					b.Fatal(err)
@@ -72,7 +83,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(b.N)*100.0/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("RepBlocks100@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=RepBlocks100/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				for i := range fs {
 					fs[i].Blocks = genBlocks(fs[i].Name, seed, 64)
@@ -86,7 +97,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(b.N)*100.0/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("RepSame100@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=RepSame100/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				for i := range fs {
 					fs[i].Version = fs[i].Version.Update(42)
@@ -98,7 +109,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(b.N)*100.0/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("Insert100Rem@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=Insert100Rem/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				for i := range fs {
 					fs[i].Blocks = genBlocks(fs[i].Name, seed, 64)
@@ -112,7 +123,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(b.N)*100.0/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("GetGlobal100@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=GetGlobal100/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				for i := range fs {
 					_, ok, err := db.GetGlobalFile(folderID, fs[i].Name)
@@ -127,7 +138,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(b.N)*100.0/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("LocalSequenced@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=LocalSequenced/size=%d", size), func(b *testing.B) {
 			count := 0
 			for range b.N {
 				cur, err := db.GetDeviceSequence(folderID, protocol.LocalDeviceID)
@@ -146,7 +157,21 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(count)/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("GetDeviceSequenceLoc@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=AllLocalBlocksWithHash/size=%d", size), func(b *testing.B) {
+			count := 0
+			for range b.N {
+				it, errFn := db.AllLocalBlocksWithHash(folderID, globalFi.Blocks[0].Hash)
+				for range it {
+					count++
+				}
+				if err := errFn(); err != nil {
+					b.Fatal(err)
+				}
+			}
+			b.ReportMetric(float64(count)/b.Elapsed().Seconds(), "blocks/s")
+		})
+
+		b.Run(fmt.Sprintf("n=GetDeviceSequenceLoc/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				_, err := db.GetDeviceSequence(folderID, protocol.LocalDeviceID)
 				if err != nil {
@@ -154,7 +179,7 @@ func BenchmarkUpdate(b *testing.B) {
 				}
 			}
 		})
-		b.Run(fmt.Sprintf("GetDeviceSequenceRem@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=GetDeviceSequenceRem/size=%d", size), func(b *testing.B) {
 			for range b.N {
 				_, err := db.GetDeviceSequence(folderID, protocol.DeviceID{42})
 				if err != nil {
@@ -163,7 +188,7 @@ func BenchmarkUpdate(b *testing.B) {
 			}
 		})
 
-		b.Run(fmt.Sprintf("RemoteNeed@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=RemoteNeed/size=%d", size), func(b *testing.B) {
 			count := 0
 			for range b.N {
 				it, errFn := db.AllNeededGlobalFiles(folderID, protocol.DeviceID{42}, config.PullOrderAlphabetic, 0, 0)
@@ -178,7 +203,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(count)/b.Elapsed().Seconds(), "files/s")
 		})
 
-		b.Run(fmt.Sprintf("LocalNeed100Largest@%d", size), func(b *testing.B) {
+		b.Run(fmt.Sprintf("n=LocalNeed100Largest/size=%d", size), func(b *testing.B) {
 			count := 0
 			for range b.N {
 				it, errFn := db.AllNeededGlobalFiles(folderID, protocol.LocalDeviceID, config.PullOrderLargestFirst, 100, 0)
@@ -193,7 +218,7 @@ func BenchmarkUpdate(b *testing.B) {
 			b.ReportMetric(float64(count)/b.Elapsed().Seconds(), "files/s")
 		})
 
-		size <<= 1
+		size += 1000
 	}
 }
 
@@ -202,7 +227,7 @@ func TestBenchmarkDropAllRemote(t *testing.T) {
 		t.Skip("slow test")
 	}
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

internal/db/sqlite/db_global_test.go

@@ -17,7 +17,7 @@ import (
 func TestNeed(t *testing.T) {
 	t.Helper()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -115,7 +115,7 @@ func TestDropRecalcsGlobal(t *testing.T) {
 func testDropWithDropper(t *testing.T, dropper func(t *testing.T, db *DB)) {
 	t.Helper()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -181,7 +181,7 @@ func testDropWithDropper(t *testing.T, dropper func(t *testing.T, db *DB)) {
 func TestNeedDeleted(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -224,7 +224,7 @@ func TestNeedDeleted(t *testing.T) {
 func TestDontNeedIgnored(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -271,7 +271,7 @@ func TestDontNeedIgnored(t *testing.T) {
 func TestDontNeedRemoteInvalid(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -322,7 +322,7 @@ func TestDontNeedRemoteInvalid(t *testing.T) {
 func TestRemoteDontNeedLocalIgnored(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -364,7 +364,7 @@ func TestRemoteDontNeedLocalIgnored(t *testing.T) {
 func TestLocalDontNeedDeletedMissing(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -406,7 +406,7 @@ func TestLocalDontNeedDeletedMissing(t *testing.T) {
 func TestRemoteDontNeedDeletedMissing(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -474,7 +474,7 @@ func TestRemoteDontNeedDeletedMissing(t *testing.T) {
 func TestNeedRemoteSymlinkAndDir(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -517,7 +517,7 @@ func TestNeedRemoteSymlinkAndDir(t *testing.T) {
 func TestNeedPagination(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -583,7 +583,7 @@ func TestDeletedAfterConflict(t *testing.T) {
 	// 23NHXGS  FILE  TreeSizeFreeSetup.exe  445       ---      2025-06-23T03:16:10.2804841Z  13832808  -nG----  HZJYWFM:1751507473                     7B4kLitF
 	// JKX6ZDN  FILE  TreeSizeFreeSetup.exe  320       ---      2025-06-23T03:16:10.2804841Z  13832808  -------  JKX6ZDN:1750992570                     7B4kLitF
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

internal/db/sqlite/db_indexid_test.go

@@ -15,7 +15,7 @@ import (
 func TestIndexIDs(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal()
 	}

internal/db/sqlite/db_local_test.go

@@ -16,7 +16,7 @@ import (
 func TestBlocks(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal()
 	}
@@ -89,7 +89,7 @@ func TestBlocks(t *testing.T) {
 func TestBlocksDeleted(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal()
 	}
@@ -141,7 +141,7 @@ func TestBlocksDeleted(t *testing.T) {
 func TestRemoteSequence(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal()
 	}

internal/db/sqlite/db_mtimes_test.go

@@ -14,7 +14,7 @@ import (
 func TestMtimePairs(t *testing.T) {
 	t.Parallel()
 
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal()
 	}

internal/db/sqlite/db_open.go

@@ -82,6 +82,10 @@ func Open(path string, opts ...Option) (*DB, error) {
 		opt(db)
 	}
 
+	if err := db.cleanDroppedFolders(); err != nil {
+		slog.Warn("Failed to clean dropped folders", slogutil.Error(err))
+	}
+
 	return db, nil
 }
 
@@ -120,27 +124,13 @@ func OpenForMigration(path string) (*DB, error) {
 		folderDBOpener: openFolderDBForMigration,
 	}
 
-	// // Touch device IDs that should always exist and have a low index
-	// // numbers, and will never change
-	// db.localDeviceIdx, _ = db.deviceIdxLocked(protocol.LocalDeviceID)
-	// db.tplInput["LocalDeviceIdx"] = db.localDeviceIdx
+	if err := db.cleanDroppedFolders(); err != nil {
+		slog.Warn("Failed to clean dropped folders", slogutil.Error(err))
+	}
 
 	return db, nil
 }
 
-func OpenTemp() (*DB, error) {
-	// SQLite has a memory mode, but it works differently with concurrency
-	// compared to what we need with the WAL mode. So, no memory databases
-	// for now.
-	dir, err := os.MkdirTemp("", "syncthing-db")
-	if err != nil {
-		return nil, wrap(err)
-	}
-	path := filepath.Join(dir, "db")
-	slog.Debug("Test DB", slogutil.FilePath(path))
-	return Open(path)
-}
-
 func (s *DB) Close() error {
 	s.folderDBsMut.Lock()
 	defer s.folderDBsMut.Unlock()

internal/db/sqlite/db_test.go

@@ -36,7 +36,7 @@ const (
 func TestBasics(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -81,7 +81,12 @@ func TestBasics(t *testing.T) {
 	)
 
 	t.Run("SchemaVersion", func(t *testing.T) {
-		ver, err := sdb.getAppliedSchemaVersion()
+		tx, err := sdb.sql.Beginx()
+		if err != nil {
+			t.Fatal(err)
+		}
+		defer tx.Rollback()
+		ver, err := sdb.getAppliedSchemaVersion(tx)
 		if err != nil {
 			t.Fatal(err)
 		}
@@ -427,7 +432,7 @@ func TestBasics(t *testing.T) {
 func TestPrefixGlobbing(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -496,7 +501,7 @@ func TestPrefixGlobbing(t *testing.T) {
 func TestPrefixGlobbingStar(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -529,7 +534,7 @@ func TestPrefixGlobbingStar(t *testing.T) {
 }
 
 func TestAvailability(t *testing.T) {
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -596,7 +601,7 @@ func TestAvailability(t *testing.T) {
 }
 
 func TestDropFilesNamed(t *testing.T) {
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -640,7 +645,7 @@ func TestDropFilesNamed(t *testing.T) {
 }
 
 func TestDropFolder(t *testing.T) {
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -700,7 +705,7 @@ func TestDropFolder(t *testing.T) {
 }
 
 func TestDropDevice(t *testing.T) {
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -764,7 +769,7 @@ func TestDropDevice(t *testing.T) {
 }
 
 func TestDropAllFiles(t *testing.T) {
-	db, err := OpenTemp()
+	db, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -926,7 +931,7 @@ func TestConcurrentUpdateSelect(t *testing.T) {
 func TestAllForBlocksHash(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -988,7 +993,7 @@ func TestAllForBlocksHash(t *testing.T) {
 func TestBlocklistGarbageCollection(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1067,7 +1072,7 @@ func TestBlocklistGarbageCollection(t *testing.T) {
 func TestInsertLargeFile(t *testing.T) {
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1119,7 +1124,7 @@ func TestStrangeDeletedGlobalBug(t *testing.T) {
 
 	t.Parallel()
 
-	sdb, err := OpenTemp()
+	sdb, err := Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

internal/db/sqlite/db_update.go

@@ -8,9 +8,14 @@ package sqlite
 
 import (
 	"fmt"
+	"log/slog"
 	"os"
+	"path/filepath"
 	"runtime"
+	"slices"
 	"strings"
+
+	"github.com/syncthing/syncthing/internal/slogutil"
 )
 
 func (s *DB) DropFolder(folder string) error {
@@ -41,6 +46,37 @@ func (s *DB) ListFolders() ([]string, error) {
 	return res, wrap(err)
 }
 
+// cleanDroppedFolders removes old database files for folders that no longer
+// exist in the main database.
+func (s *DB) cleanDroppedFolders() error {
+	// All expected folder databeses.
+	var names []string
+	err := s.stmt(`SELECT database_name FROM folders`).Select(&names)
+	if err != nil {
+		return wrap(err)
+	}
+
+	// All folder database files on disk.
+	files, err := filepath.Glob(filepath.Join(s.pathBase, "folder.*"))
+	if err != nil {
+		return wrap(err)
+	}
+
+	// Any files that don't match a name in the database are removed.
+	for _, file := range files {
+		base := filepath.Base(file)
+		inDB := slices.ContainsFunc(names, func(name string) bool { return strings.HasPrefix(base, name) })
+		if !inDB {
+			if err := os.Remove(file); err != nil {
+				slog.Warn("Failed to remove database file for old, dropped folder", slogutil.FilePath(base))
+			} else {
+				slog.Info("Cleaned out database file for old, dropped folder", slogutil.FilePath(base))
+			}
+		}
+	}
+	return nil
+}
+
 // wrap returns the error wrapped with the calling function name and
 // optional extra context strings as prefix. A nil error wraps to nil.
 func wrap(err error, context ...string) error {

internal/db/sqlite/folderdb_update.go

@@ -114,11 +114,9 @@ func (s *folderDB) Update(device protocol.DeviceID, fs []protocol.FileInfo) erro
 			if err != nil {
 				return wrap(err, "marshal blocklist")
 			}
-			if _, err := insertBlockListStmt.Exec(f.BlocksHash, bs); err != nil {
+			if res, err := insertBlockListStmt.Exec(f.BlocksHash, bs); err != nil {
 				return wrap(err, "insert blocklist")
-			}
-
-			if device == protocol.LocalDeviceID {
+			} else if aff, _ := res.RowsAffected(); aff != 0 && device == protocol.LocalDeviceID {
 				// Insert all blocks
 				if err := s.insertBlocksLocked(txp, f.BlocksHash, f.Blocks); err != nil {
 					return wrap(err, "insert blocks")

internal/db/sqlite/sql/README.md

@@ -2,7 +2,7 @@ These SQL scripts are embedded in the binary.
 
 Scripts in `schema/` are run at every startup, in alphanumerical order.
 
-Scripts in `migrations/` are run when a migration is needed; the must begin
+Scripts in `migrations/` are run when a migration is needed; they must begin
 with a number that equals the schema version that results from that
 migration. Migrations are not run on initial database creation, so the
 scripts in `schema/` should create the latest version.

internal/db/sqlite/sql/migrations/folder/04-alter-blocks-tables.sql

@@ -0,0 +1,51 @@
+-- Copyright (C) 2025 The Syncthing Authors.
+--
+-- This Source Code Form is subject to the terms of the Mozilla Public
+-- License, v. 2.0. If a copy of the MPL was not distributed with this file,
+-- You can obtain one at https://mozilla.org/MPL/2.0/.
+
+-- Copy blocks to new table with fewer indexes
+
+DROP TABLE IF EXISTS blocks_v4
+;
+
+CREATE TABLE blocks_v4 (
+    hash BLOB NOT NULL,
+    blocklist_hash BLOB NOT NULL,
+    idx INTEGER NOT NULL,
+    offset INTEGER NOT NULL,
+    size INTEGER NOT NULL,
+    PRIMARY KEY (hash, blocklist_hash, idx)
+) STRICT, WITHOUT ROWID
+;
+
+INSERT INTO blocks_v4 (hash, blocklist_hash, idx, offset, size)
+SELECT hash, blocklist_hash, idx, offset, size FROM blocks ORDER BY hash, blocklist_hash, idx
+;
+
+DROP TABLE blocks
+;
+
+ALTER TABLE blocks_v4 RENAME TO blocks
+;
+
+-- Copy blocklists to new table with fewer indexes
+
+DROP TABLE IF EXISTS blocklists_v4
+;
+
+CREATE TABLE blocklists_v4 (
+    blocklist_hash BLOB NOT NULL PRIMARY KEY,
+    blprotobuf BLOB NOT NULL
+) STRICT, WITHOUT ROWID
+;
+
+INSERT INTO blocklists_v4 (blocklist_hash, blprotobuf)
+SELECT blocklist_hash, blprotobuf FROM blocklists ORDER BY blocklist_hash
+;
+
+DROP TABLE blocklists
+;
+
+ALTER TABLE blocklists_v4 RENAME TO blocklists
+;

internal/db/sqlite/sql/schema/folder/50-blocks.sql

@@ -14,21 +14,21 @@
 CREATE TABLE IF NOT EXISTS blocklists (
     blocklist_hash BLOB NOT NULL PRIMARY KEY,
     blprotobuf BLOB NOT NULL
-) STRICT
+) STRICT, WITHOUT ROWID
 ;
 
 -- Blocks
 --
 -- For all local files we store the blocks individually for quick lookup. A
 -- given block can exist in multiple blocklists and at multiple offsets in a
--- blocklist.
+-- blocklist. We eschew most indexes here as inserting millions of blocks is
+-- common and performance is critical.
 CREATE TABLE IF NOT EXISTS blocks (
     hash BLOB NOT NULL,
     blocklist_hash BLOB NOT NULL,
     idx INTEGER NOT NULL,
     offset INTEGER NOT NULL,
     size INTEGER NOT NULL,
-    PRIMARY KEY (hash, blocklist_hash, idx),
-    FOREIGN KEY(blocklist_hash) REFERENCES blocklists(blocklist_hash) ON DELETE CASCADE DEFERRABLE INITIALLY DEFERRED
-) STRICT
+    PRIMARY KEY(hash, blocklist_hash, idx)
+) STRICT, WITHOUT ROWID
 ;

internal/db/typed_test.go

@@ -17,7 +17,7 @@ import (
 func TestNamespacedInt(t *testing.T) {
 	t.Parallel()
 
-	ldb, err := sqlite.OpenTemp()
+	ldb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

internal/slogutil/sloginit.go

@@ -7,6 +7,7 @@
 package slogutil
 
 import (
+	"io"
 	"log/slog"
 	"os"
 	"strings"
@@ -21,10 +22,20 @@ var (
 	}
 	slogDef = slog.New(&formattingHandler{
 		recs: []*lineRecorder{GlobalRecorder, ErrorRecorder},
-		out:  os.Stdout,
+		out:  logWriter(),
 	})
 )
 
+func logWriter() io.Writer {
+	if os.Getenv("LOGGER_DISCARD") != "" {
+		// Hack to completely disable logging, for example when running
+		// benchmarks.
+		return io.Discard
+	}
+
+	return os.Stdout
+}
+
 func init() {
 	slog.SetDefault(slogDef)
 

lib/api/api_auth_test.go

@@ -130,7 +130,7 @@ func (c *mockClock) wind(t time.Duration) {
 func TestTokenManager(t *testing.T) {
 	t.Parallel()
 
-	mdb, err := sqlite.OpenTemp()
+	mdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

lib/api/api_test.go

@@ -82,7 +82,7 @@ func TestStopAfterBrokenConfig(t *testing.T) {
 	}
 	w := config.Wrap("/dev/null", cfg, protocol.LocalDeviceID, events.NoopLogger)
 
-	mdb, err := sqlite.OpenTemp()
+	mdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1049,7 +1049,7 @@ func startHTTPWithShutdownTimeout(t *testing.T, cfg config.Wrapper, shutdownTime
 
 	// Instantiate the API service
 	urService := ur.New(cfg, m, connections, false)
-	mdb, err := sqlite.OpenTemp()
+	mdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}
@@ -1567,7 +1567,7 @@ func TestEventMasks(t *testing.T) {
 	cfg := newMockedConfig()
 	defSub := new(eventmocks.BufferedSubscription)
 	diskSub := new(eventmocks.BufferedSubscription)
-	mdb, err := sqlite.OpenTemp()
+	mdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

lib/config/mocks/mocked_wrapper.go

@@ -1809,60 +1809,6 @@ func (fake *Wrapper) UnsubscribeArgsForCall(i int) config.Committer {
 func (fake *Wrapper) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.configPathMutex.RLock()
-	defer fake.configPathMutex.RUnlock()
-	fake.defaultDeviceMutex.RLock()
-	defer fake.defaultDeviceMutex.RUnlock()
-	fake.defaultFolderMutex.RLock()
-	defer fake.defaultFolderMutex.RUnlock()
-	fake.defaultIgnoresMutex.RLock()
-	defer fake.defaultIgnoresMutex.RUnlock()
-	fake.deviceMutex.RLock()
-	defer fake.deviceMutex.RUnlock()
-	fake.deviceListMutex.RLock()
-	defer fake.deviceListMutex.RUnlock()
-	fake.devicesMutex.RLock()
-	defer fake.devicesMutex.RUnlock()
-	fake.folderMutex.RLock()
-	defer fake.folderMutex.RUnlock()
-	fake.folderListMutex.RLock()
-	defer fake.folderListMutex.RUnlock()
-	fake.folderPasswordsMutex.RLock()
-	defer fake.folderPasswordsMutex.RUnlock()
-	fake.foldersMutex.RLock()
-	defer fake.foldersMutex.RUnlock()
-	fake.gUIMutex.RLock()
-	defer fake.gUIMutex.RUnlock()
-	fake.ignoredDeviceMutex.RLock()
-	defer fake.ignoredDeviceMutex.RUnlock()
-	fake.ignoredDevicesMutex.RLock()
-	defer fake.ignoredDevicesMutex.RUnlock()
-	fake.ignoredFolderMutex.RLock()
-	defer fake.ignoredFolderMutex.RUnlock()
-	fake.lDAPMutex.RLock()
-	defer fake.lDAPMutex.RUnlock()
-	fake.modifyMutex.RLock()
-	defer fake.modifyMutex.RUnlock()
-	fake.myIDMutex.RLock()
-	defer fake.myIDMutex.RUnlock()
-	fake.optionsMutex.RLock()
-	defer fake.optionsMutex.RUnlock()
-	fake.rawCopyMutex.RLock()
-	defer fake.rawCopyMutex.RUnlock()
-	fake.removeDeviceMutex.RLock()
-	defer fake.removeDeviceMutex.RUnlock()
-	fake.removeFolderMutex.RLock()
-	defer fake.removeFolderMutex.RUnlock()
-	fake.requiresRestartMutex.RLock()
-	defer fake.requiresRestartMutex.RUnlock()
-	fake.saveMutex.RLock()
-	defer fake.saveMutex.RUnlock()
-	fake.serveMutex.RLock()
-	defer fake.serveMutex.RUnlock()
-	fake.subscribeMutex.RLock()
-	defer fake.subscribeMutex.RUnlock()
-	fake.unsubscribeMutex.RLock()
-	defer fake.unsubscribeMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/config/wrapper.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/mocked_wrapper.go --fake-name Wrapper . Wrapper
+//go:generate go tool counterfeiter -o mocks/mocked_wrapper.go --fake-name Wrapper . Wrapper
 
 package config
 

lib/connections/mocks/service.go

@@ -403,18 +403,6 @@ func (fake *Service) ServeReturnsOnCall(i int, result1 error) {
 func (fake *Service) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.allAddressesMutex.RLock()
-	defer fake.allAddressesMutex.RUnlock()
-	fake.connectionStatusMutex.RLock()
-	defer fake.connectionStatusMutex.RUnlock()
-	fake.externalAddressesMutex.RLock()
-	defer fake.externalAddressesMutex.RUnlock()
-	fake.listenerStatusMutex.RLock()
-	defer fake.listenerStatusMutex.RUnlock()
-	fake.nATTypeMutex.RLock()
-	defer fake.nATTypeMutex.RUnlock()
-	fake.serveMutex.RLock()
-	defer fake.serveMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/connections/service.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/service.go --fake-name Service . Service
+//go:generate go tool counterfeiter -o mocks/service.go --fake-name Service . Service
 
 package connections
 

lib/discover/manager.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/manager.go --fake-name Manager . Manager
+//go:generate go tool counterfeiter -o mocks/manager.go --fake-name Manager . Manager
 
 package discover
 

lib/discover/mocks/manager.go

@@ -420,18 +420,6 @@ func (fake *Manager) StringReturnsOnCall(i int, result1 string) {
 func (fake *Manager) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.cacheMutex.RLock()
-	defer fake.cacheMutex.RUnlock()
-	fake.childErrorsMutex.RLock()
-	defer fake.childErrorsMutex.RUnlock()
-	fake.errorMutex.RLock()
-	defer fake.errorMutex.RUnlock()
-	fake.lookupMutex.RLock()
-	defer fake.lookupMutex.RUnlock()
-	fake.serveMutex.RLock()
-	defer fake.serveMutex.RUnlock()
-	fake.stringMutex.RLock()
-	defer fake.stringMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/events/events.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/buffered_subscription.go --fake-name BufferedSubscription . BufferedSubscription
+//go:generate go tool counterfeiter -o mocks/buffered_subscription.go --fake-name BufferedSubscription . BufferedSubscription
 
 // Package events provides event subscription and polling functionality.
 package events

lib/events/mocks/buffered_subscription.go

@@ -160,10 +160,6 @@ func (fake *BufferedSubscription) SinceReturnsOnCall(i int, result1 []events.Eve
 func (fake *BufferedSubscription) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.maskMutex.RLock()
-	defer fake.maskMutex.RUnlock()
-	fake.sinceMutex.RLock()
-	defer fake.sinceMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/model/folder_summary.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/folderSummaryService.go --fake-name FolderSummaryService . FolderSummaryService
+//go:generate go tool counterfeiter -o mocks/folderSummaryService.go --fake-name FolderSummaryService . FolderSummaryService
 
 package model
 

lib/model/mocks/folderSummaryService.go

@@ -165,10 +165,6 @@ func (fake *FolderSummaryService) SummaryReturnsOnCall(i int, result1 *model.Fol
 func (fake *FolderSummaryService) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.serveMutex.RLock()
-	defer fake.serveMutex.RUnlock()
-	fake.summaryMutex.RLock()
-	defer fake.summaryMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/model/mocks/model.go

@@ -3837,112 +3837,6 @@ func (fake *Model) WatchErrorReturnsOnCall(i int, result1 error) {
 func (fake *Model) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.addConnectionMutex.RLock()
-	defer fake.addConnectionMutex.RUnlock()
-	fake.allGlobalFilesMutex.RLock()
-	defer fake.allGlobalFilesMutex.RUnlock()
-	fake.availabilityMutex.RLock()
-	defer fake.availabilityMutex.RUnlock()
-	fake.bringToFrontMutex.RLock()
-	defer fake.bringToFrontMutex.RUnlock()
-	fake.closedMutex.RLock()
-	defer fake.closedMutex.RUnlock()
-	fake.clusterConfigMutex.RLock()
-	defer fake.clusterConfigMutex.RUnlock()
-	fake.completionMutex.RLock()
-	defer fake.completionMutex.RUnlock()
-	fake.connectedToMutex.RLock()
-	defer fake.connectedToMutex.RUnlock()
-	fake.connectionStatsMutex.RLock()
-	defer fake.connectionStatsMutex.RUnlock()
-	fake.currentFolderFileMutex.RLock()
-	defer fake.currentFolderFileMutex.RUnlock()
-	fake.currentGlobalFileMutex.RLock()
-	defer fake.currentGlobalFileMutex.RUnlock()
-	fake.currentIgnoresMutex.RLock()
-	defer fake.currentIgnoresMutex.RUnlock()
-	fake.delayScanMutex.RLock()
-	defer fake.delayScanMutex.RUnlock()
-	fake.deviceStatisticsMutex.RLock()
-	defer fake.deviceStatisticsMutex.RUnlock()
-	fake.dismissPendingDeviceMutex.RLock()
-	defer fake.dismissPendingDeviceMutex.RUnlock()
-	fake.dismissPendingFolderMutex.RLock()
-	defer fake.dismissPendingFolderMutex.RUnlock()
-	fake.downloadProgressMutex.RLock()
-	defer fake.downloadProgressMutex.RUnlock()
-	fake.folderErrorsMutex.RLock()
-	defer fake.folderErrorsMutex.RUnlock()
-	fake.folderProgressBytesCompletedMutex.RLock()
-	defer fake.folderProgressBytesCompletedMutex.RUnlock()
-	fake.folderStatisticsMutex.RLock()
-	defer fake.folderStatisticsMutex.RUnlock()
-	fake.getFolderVersionsMutex.RLock()
-	defer fake.getFolderVersionsMutex.RUnlock()
-	fake.globalDirectoryTreeMutex.RLock()
-	defer fake.globalDirectoryTreeMutex.RUnlock()
-	fake.globalSizeMutex.RLock()
-	defer fake.globalSizeMutex.RUnlock()
-	fake.indexMutex.RLock()
-	defer fake.indexMutex.RUnlock()
-	fake.indexUpdateMutex.RLock()
-	defer fake.indexUpdateMutex.RUnlock()
-	fake.loadIgnoresMutex.RLock()
-	defer fake.loadIgnoresMutex.RUnlock()
-	fake.localChangedFolderFilesMutex.RLock()
-	defer fake.localChangedFolderFilesMutex.RUnlock()
-	fake.localFilesMutex.RLock()
-	defer fake.localFilesMutex.RUnlock()
-	fake.localFilesSequencedMutex.RLock()
-	defer fake.localFilesSequencedMutex.RUnlock()
-	fake.localSizeMutex.RLock()
-	defer fake.localSizeMutex.RUnlock()
-	fake.needFolderFilesMutex.RLock()
-	defer fake.needFolderFilesMutex.RUnlock()
-	fake.needSizeMutex.RLock()
-	defer fake.needSizeMutex.RUnlock()
-	fake.onHelloMutex.RLock()
-	defer fake.onHelloMutex.RUnlock()
-	fake.overrideMutex.RLock()
-	defer fake.overrideMutex.RUnlock()
-	fake.pendingDevicesMutex.RLock()
-	defer fake.pendingDevicesMutex.RUnlock()
-	fake.pendingFoldersMutex.RLock()
-	defer fake.pendingFoldersMutex.RUnlock()
-	fake.receiveOnlySizeMutex.RLock()
-	defer fake.receiveOnlySizeMutex.RUnlock()
-	fake.remoteNeedFolderFilesMutex.RLock()
-	defer fake.remoteNeedFolderFilesMutex.RUnlock()
-	fake.remoteSequencesMutex.RLock()
-	defer fake.remoteSequencesMutex.RUnlock()
-	fake.requestMutex.RLock()
-	defer fake.requestMutex.RUnlock()
-	fake.requestGlobalMutex.RLock()
-	defer fake.requestGlobalMutex.RUnlock()
-	fake.resetFolderMutex.RLock()
-	defer fake.resetFolderMutex.RUnlock()
-	fake.restoreFolderVersionsMutex.RLock()
-	defer fake.restoreFolderVersionsMutex.RUnlock()
-	fake.revertMutex.RLock()
-	defer fake.revertMutex.RUnlock()
-	fake.scanFolderMutex.RLock()
-	defer fake.scanFolderMutex.RUnlock()
-	fake.scanFolderSubdirsMutex.RLock()
-	defer fake.scanFolderSubdirsMutex.RUnlock()
-	fake.scanFoldersMutex.RLock()
-	defer fake.scanFoldersMutex.RUnlock()
-	fake.sequenceMutex.RLock()
-	defer fake.sequenceMutex.RUnlock()
-	fake.serveMutex.RLock()
-	defer fake.serveMutex.RUnlock()
-	fake.setIgnoresMutex.RLock()
-	defer fake.setIgnoresMutex.RUnlock()
-	fake.stateMutex.RLock()
-	defer fake.stateMutex.RUnlock()
-	fake.usageReportingStatsMutex.RLock()
-	defer fake.usageReportingStatsMutex.RUnlock()
-	fake.watchErrorMutex.RLock()
-	defer fake.watchErrorMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/model/model.go

@@ -4,8 +4,7 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-//go:generate counterfeiter -o mocks/model.go --fake-name Model . Model
+//go:generate go tool counterfeiter -o mocks/model.go --fake-name Model . Model
 
 package model
 
@@ -2549,6 +2548,12 @@ func (m *model) numHashers(folder string) int {
 	m.mut.RLock()
 	folderCfg := m.folderCfgs[folder]
 	numFolders := max(1, len(m.folderCfgs))
+	// MaxFolderConcurrency already limits the number of scanned folders, so
+	// prefer it over the overall number of folders to avoid limiting performance
+	// further for no reason.
+	if concurrency := m.cfg.Options().MaxFolderConcurrency(); concurrency > 0 {
+		numFolders = min(numFolders, concurrency)
+	}
 	m.mut.RUnlock()
 
 	if folderCfg.Hashers > 0 {
@@ -2556,16 +2561,17 @@ func (m *model) numHashers(folder string) int {
 		return folderCfg.Hashers
 	}
 
+	numCpus := runtime.GOMAXPROCS(-1)
 	if build.IsWindows || build.IsDarwin || build.IsIOS || build.IsAndroid {
 		// Interactive operating systems; don't load the system too heavily by
 		// default.
-		return 1
+		numCpus = max(1, numCpus/4)
 	}
 
 	// For other operating systems and architectures, lets try to get some
 	// work done... Divide the available CPU cores among the configured
 	// folders.
-	if perFolder := runtime.GOMAXPROCS(-1) / numFolders; perFolder > 0 {
+	if perFolder := numCpus / numFolders; perFolder > 0 {
 		return perFolder
 	}
 

lib/model/testutils_test.go

@@ -149,7 +149,7 @@ type testModel struct {
 func newModel(t testing.TB, cfg config.Wrapper, id protocol.DeviceID, protectedFiles []string) *testModel {
 	t.Helper()
 	evLogger := events.NewLogger()
-	mdb, err := sqlite.OpenTemp()
+	mdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

lib/protocol/mocked_connection_info_test.go

@@ -582,24 +582,6 @@ func (fake *mockedConnectionInfo) TypeReturnsOnCall(i int, result1 string) {
 func (fake *mockedConnectionInfo) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.connectionIDMutex.RLock()
-	defer fake.connectionIDMutex.RUnlock()
-	fake.cryptoMutex.RLock()
-	defer fake.cryptoMutex.RUnlock()
-	fake.establishedAtMutex.RLock()
-	defer fake.establishedAtMutex.RUnlock()
-	fake.isLocalMutex.RLock()
-	defer fake.isLocalMutex.RUnlock()
-	fake.priorityMutex.RLock()
-	defer fake.priorityMutex.RUnlock()
-	fake.remoteAddrMutex.RLock()
-	defer fake.remoteAddrMutex.RUnlock()
-	fake.stringMutex.RLock()
-	defer fake.stringMutex.RUnlock()
-	fake.transportMutex.RLock()
-	defer fake.transportMutex.RUnlock()
-	fake.typeMutex.RLock()
-	defer fake.typeMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/protocol/mocks/connection.go

@@ -1144,44 +1144,6 @@ func (fake *Connection) TypeReturnsOnCall(i int, result1 string) {
 func (fake *Connection) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.closeMutex.RLock()
-	defer fake.closeMutex.RUnlock()
-	fake.closedMutex.RLock()
-	defer fake.closedMutex.RUnlock()
-	fake.clusterConfigMutex.RLock()
-	defer fake.clusterConfigMutex.RUnlock()
-	fake.connectionIDMutex.RLock()
-	defer fake.connectionIDMutex.RUnlock()
-	fake.cryptoMutex.RLock()
-	defer fake.cryptoMutex.RUnlock()
-	fake.deviceIDMutex.RLock()
-	defer fake.deviceIDMutex.RUnlock()
-	fake.downloadProgressMutex.RLock()
-	defer fake.downloadProgressMutex.RUnlock()
-	fake.establishedAtMutex.RLock()
-	defer fake.establishedAtMutex.RUnlock()
-	fake.indexMutex.RLock()
-	defer fake.indexMutex.RUnlock()
-	fake.indexUpdateMutex.RLock()
-	defer fake.indexUpdateMutex.RUnlock()
-	fake.isLocalMutex.RLock()
-	defer fake.isLocalMutex.RUnlock()
-	fake.priorityMutex.RLock()
-	defer fake.priorityMutex.RUnlock()
-	fake.remoteAddrMutex.RLock()
-	defer fake.remoteAddrMutex.RUnlock()
-	fake.requestMutex.RLock()
-	defer fake.requestMutex.RUnlock()
-	fake.startMutex.RLock()
-	defer fake.startMutex.RUnlock()
-	fake.statisticsMutex.RLock()
-	defer fake.statisticsMutex.RUnlock()
-	fake.stringMutex.RLock()
-	defer fake.stringMutex.RUnlock()
-	fake.transportMutex.RLock()
-	defer fake.transportMutex.RUnlock()
-	fake.typeMutex.RLock()
-	defer fake.typeMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/protocol/mocks/connection_info.go

@@ -584,24 +584,6 @@ func (fake *ConnectionInfo) TypeReturnsOnCall(i int, result1 string) {
 func (fake *ConnectionInfo) Invocations() map[string][][]interface{} {
 	fake.invocationsMutex.RLock()
 	defer fake.invocationsMutex.RUnlock()
-	fake.connectionIDMutex.RLock()
-	defer fake.connectionIDMutex.RUnlock()
-	fake.cryptoMutex.RLock()
-	defer fake.cryptoMutex.RUnlock()
-	fake.establishedAtMutex.RLock()
-	defer fake.establishedAtMutex.RUnlock()
-	fake.isLocalMutex.RLock()
-	defer fake.isLocalMutex.RUnlock()
-	fake.priorityMutex.RLock()
-	defer fake.priorityMutex.RUnlock()
-	fake.remoteAddrMutex.RLock()
-	defer fake.remoteAddrMutex.RUnlock()
-	fake.stringMutex.RLock()
-	defer fake.stringMutex.RUnlock()
-	fake.transportMutex.RLock()
-	defer fake.transportMutex.RUnlock()
-	fake.typeMutex.RLock()
-	defer fake.typeMutex.RUnlock()
 	copiedInvocations := map[string][][]interface{}{}
 	for key, value := range fake.invocations {
 		copiedInvocations[key] = value

lib/protocol/protocol.go

@@ -4,14 +4,12 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:generate -command counterfeiter go run github.com/maxbrunsfeld/counterfeiter/v6
-
 // Prevents import loop, for internal testing
-//go:generate counterfeiter -o mocked_connection_info_test.go --fake-name mockedConnectionInfo . ConnectionInfo
+//go:generate go tool counterfeiter -o mocked_connection_info_test.go --fake-name mockedConnectionInfo . ConnectionInfo
 //go:generate go run ../../script/prune_mocks.go -t mocked_connection_info_test.go
 
-//go:generate counterfeiter -o mocks/connection_info.go --fake-name ConnectionInfo . ConnectionInfo
-//go:generate counterfeiter -o mocks/connection.go --fake-name Connection . Connection
+//go:generate go tool counterfeiter -o mocks/connection_info.go --fake-name ConnectionInfo . ConnectionInfo
+//go:generate go tool counterfeiter -o mocks/connection.go --fake-name Connection . Connection
 
 package protocol
 

lib/relay/protocol/packets.go

@@ -1,7 +1,6 @@
 // Copyright (C) 2015 Audrius Butkevicius and Contributors (see the CONTRIBUTORS file).
 
-//go:generate -command genxdr go run github.com/calmh/xdr/cmd/genxdr
-//go:generate genxdr -o packets_xdr.go packets.go
+//go:generate go tool genxdr -o packets_xdr.go packets.go
 
 package protocol
 

lib/stats/stats_test.go

@@ -18,7 +18,7 @@ import (
 )
 
 func TestDeviceStat(t *testing.T) {
-	sdb, err := sqlite.OpenTemp()
+	sdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

lib/syncthing/syncthing.go

@@ -191,6 +191,10 @@ func (a *App) startup() error {
 		if _, ok := cfgFolders[folder]; !ok {
 			slog.Info("Cleaning metadata for dropped folder", "folder", folder)
 			a.sdb.DropFolder(folder)
+		} else {
+			// Open the folder database, causing it to apply migrations
+			// early when appropriate.
+			_, _ = a.sdb.GetDeviceSequence(folder, protocol.LocalDeviceID)
 		}
 	}
 

lib/syncthing/syncthing_test.go

@@ -72,7 +72,7 @@ func TestStartupFail(t *testing.T) {
 	}, protocol.LocalDeviceID, events.NoopLogger)
 	defer os.Remove(cfg.ConfigPath())
 
-	sdb, err := sqlite.OpenTemp()
+	sdb, err := sqlite.Open(t.TempDir())
 	if err != nil {
 		t.Fatal(err)
 	}

lib/syncthing/utils.go

@@ -7,11 +7,13 @@
 package syncthing
 
 import (
+	"context"
 	"crypto/tls"
 	"errors"
 	"fmt"
 	"io"
 	"log/slog"
+	"net/http"
 	"os"
 	"sync"
 	"time"
@@ -156,7 +158,8 @@ func OpenDatabase(path string, deleteRetention time.Duration) (db.DB, error) {
 }
 
 // Attempts migration of the old (LevelDB-based) database type to the new (SQLite-based) type
-func TryMigrateDatabase(deleteRetention time.Duration) error {
+// This will attempt to provide a temporary API server during the migration, if `apiAddr` is not empty.
+func TryMigrateDatabase(ctx context.Context, deleteRetention time.Duration, apiAddr string) error {
 	oldDBDir := locations.Get(locations.LegacyDatabase)
 	if _, err := os.Lstat(oldDBDir); err != nil {
 		// No old database
@@ -170,6 +173,14 @@ func TryMigrateDatabase(deleteRetention time.Duration) error {
 	}
 	defer be.Close()
 
+	// Start a temporary API server during the migration
+	if apiAddr != "" {
+		api := migratingAPI{addr: apiAddr}
+		apiCtx, cancel := context.WithCancel(ctx)
+		defer cancel()
+		go api.Serve(apiCtx)
+	}
+
 	sdb, err := sqlite.OpenForMigration(locations.Get(locations.Database))
 	if err != nil {
 		return err
@@ -197,12 +208,20 @@ func TryMigrateDatabase(deleteRetention time.Duration) error {
 		var writeErr error
 		var wg sync.WaitGroup
 		wg.Add(1)
+		writerDone := make(chan struct{})
 		go func() {
 			defer wg.Done()
+			defer close(writerDone)
 			var batch []protocol.FileInfo
 			files, blocks := 0, 0
 			t0 := time.Now()
 			t1 := time.Now()
+
+			if writeErr = sdb.DropFolder(folder); writeErr != nil {
+				slog.Error("Failed database drop", slogutil.Error(writeErr))
+				return
+			}
+
 			for fi := range fis {
 				batch = append(batch, fi)
 				files++
@@ -210,13 +229,14 @@ func TryMigrateDatabase(deleteRetention time.Duration) error {
 				if len(batch) == 1000 {
 					writeErr = sdb.Update(folder, protocol.LocalDeviceID, batch)
 					if writeErr != nil {
+						slog.Error("Failed database write", slogutil.Error(writeErr))
 						return
 					}
 					batch = batch[:0]
 					if time.Since(t1) > 10*time.Second {
 						d := time.Since(t0) + 1
 						t1 = time.Now()
-						slog.Info("Still migrating folder", "folder", folder, "files", files, "blocks", blocks, "duration", d.Truncate(time.Second), "filesrate", float64(files)/d.Seconds())
+						slog.Info("Still migrating folder", "folder", folder, "files", files, "blocks", blocks, "duration", d.Truncate(time.Second), "blocksrate", float64(blocks)/d.Seconds(), "filesrate", float64(files)/d.Seconds())
 					}
 				}
 			}
@@ -244,8 +264,12 @@ func TryMigrateDatabase(deleteRetention time.Duration) error {
 				// criteria in the database
 				return true
 			}
-			fis <- fi
-			return true
+			select {
+			case fis <- fi:
+				return true
+			case <-writerDone:
+				return false
+			}
 		})
 		close(fis)
 		snap.Release()
@@ -271,3 +295,27 @@ func TryMigrateDatabase(deleteRetention time.Duration) error {
 	slog.Info("Migration complete", "files", totFiles, "blocks", totBlocks/1000, "duration", time.Since(t0).Truncate(time.Second))
 	return nil
 }
+
+type migratingAPI struct {
+	addr string
+}
+
+func (m migratingAPI) Serve(ctx context.Context) error {
+	srv := &http.Server{
+		Addr: m.addr,
+		Handler: http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
+			w.Header().Set("Content-Type", "text/plain")
+			w.Write([]byte("*** Database migration in progress ***\n\n"))
+			for _, line := range slogutil.GlobalRecorder.Since(time.Time{}) {
+				line.WriteTo(w)
+			}
+		}),
+	}
+	go func() {
+		slog.InfoContext(ctx, "Starting temporary GUI/API during migration", slogutil.Address(m.addr))
+		err := srv.ListenAndServe()
+		slog.InfoContext(ctx, "Temporary GUI/API closed", slogutil.Address(m.addr), slogutil.Error(err))
+	}()
+	<-ctx.Done()
+	return srv.Close()
+}

lib/ur/contract/contract.go

@@ -188,6 +188,13 @@ type Report struct {
 	DistDist string `json:"distDist" metric:"distribution,gaugeVec:distribution"`
 	DistOS   string `json:"distOS" metric:"distribution,gaugeVec:os"`
 	DistArch string `json:"distArch" metric:"distribution,gaugeVec:arch"`
+
+	// Database counts
+	Database struct {
+		ModernCSQLite bool `json:"modernCSQLite" metric:"database_engine{engine=modernc-sqlite},gauge"`
+		MattnSQLite   bool `json:"mattnSQLite" metric:"database_engine{engine=mattn-sqlite},gauge"`
+		LevelDB       bool `json:"levelDB" metric:"database_engine{engine=leveldb},gauge"`
+	} `json:"database"`
 }
 
 func New() *Report {

man/stdiscosrv.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "STDISCOSRV" "1" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "STDISCOSRV" "1" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 stdiscosrv \- Syncthing Discovery Server
 .SH SYNOPSIS

man/strelaysrv.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "STRELAYSRV" "1" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "STRELAYSRV" "1" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 strelaysrv \- Syncthing Relay Server
 .SH SYNOPSIS

man/syncthing-bep.7

@@ -28,7 +28,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-BEP" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-BEP" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-bep \- Block Exchange Protocol v1
 .SH INTRODUCTION AND DEFINITIONS

man/syncthing-config.5

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-CONFIG" "5" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-CONFIG" "5" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-config \- Syncthing Configuration
 .SH SYNOPSIS

man/syncthing-device-ids.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-DEVICE-IDS" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-DEVICE-IDS" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-device-ids \- Understanding Device IDs
 .sp

man/syncthing-event-api.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-EVENT-API" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-EVENT-API" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-event-api \- Event API
 .SH DESCRIPTION

man/syncthing-faq.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-FAQ" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-FAQ" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-faq \- Frequently Asked Questions
 .INDENT 0.0

man/syncthing-globaldisco.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-GLOBALDISCO" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-GLOBALDISCO" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-globaldisco \- Global Discovery Protocol v3
 .SH ANNOUNCEMENTS

man/syncthing-localdisco.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-LOCALDISCO" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-LOCALDISCO" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-localdisco \- Local Discovery Protocol v4
 .SH MODE OF OPERATION

man/syncthing-networking.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-NETWORKING" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-NETWORKING" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-networking \- Firewall Setup
 .SH ROUTER SETUP

man/syncthing-relay.7

@@ -28,7 +28,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-RELAY" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-RELAY" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-relay \- Relay Protocol v1
 .SH WHAT IS A RELAY?

man/syncthing-rest-api.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-REST-API" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-REST-API" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-rest-api \- REST API
 .sp

man/syncthing-security.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-SECURITY" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-SECURITY" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-security \- Security Principles
 .sp

man/syncthing-stignore.5

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-STIGNORE" "5" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-STIGNORE" "5" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-stignore \- Prevent files from being synchronized to other nodes
 .SH SYNOPSIS

man/syncthing-versioning.7

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING-VERSIONING" "7" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING-VERSIONING" "7" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing-versioning \- Keep automatic backups of deleted files by other nodes
 .sp

man/syncthing.1

@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "SYNCTHING" "1" "Aug 11, 2025" "v2.0.0" "Syncthing"
+.TH "SYNCTHING" "1" "Aug 21, 2025" "v2.0.0" "Syncthing"
 .SH NAME
 syncthing \- Syncthing
 .SH SYNOPSIS

script/next-version.go

@@ -4,8 +4,8 @@
 // License, v. 2.0. If a copy of the MPL was not distributed with this file,
 // You can obtain one at https://mozilla.org/MPL/2.0/.
 
-//go:build ignore
-// +build ignore
+//go:build tools
+// +build tools
 
 package main
 

script/prune_mocks.go

@@ -35,7 +35,7 @@ func main() {
 		if err != nil {
 			log.Fatal(err)
 		}
-		err = exec.Command("go", "run", "golang.org/x/tools/cmd/goimports", "-w", path).Run()
+		err = exec.Command("go", "tool", "goimports", "-w", path).Run()
 		if err != nil {
 			log.Fatal(err)
 		}

tools.go

@@ -1,15 +0,0 @@
-// This file is never built. It serves to establish dependencies on tools
-// used by go generate and build.go. See
-// https://github.com/golang/go/wiki/Modules#how-can-i-track-tool-dependencies-for-a-module
-
-//go:build tools
-// +build tools
-
-package tools
-
-import (
-	_ "github.com/calmh/xdr"
-	_ "github.com/coreos/go-semver/semver"
-	_ "github.com/maxbrunsfeld/counterfeiter/v6"
-	_ "golang.org/x/tools/cmd/goimports"
-)