perf(cluster): reduce agent command queue contention

server/internal/database/database_test.go

@@ -0,0 +1,40 @@
+package database
+
+import (
+	"path/filepath"
+	"testing"
+
+	"backupx/server/internal/config"
+	"backupx/server/internal/logger"
+)
+
+func TestOpenConfiguresSQLiteForSingleMasterConcurrency(t *testing.T) {
+	log, err := logger.New(config.LogConfig{Level: "error"})
+	if err != nil {
+		t.Fatal(err)
+	}
+	db, err := Open(config.DatabaseConfig{Path: filepath.Join(t.TempDir(), "backupx.db")}, log)
+	if err != nil {
+		t.Fatal(err)
+	}
+	sqlDB, err := db.DB()
+	if err != nil {
+		t.Fatal(err)
+	}
+	t.Cleanup(func() { _ = sqlDB.Close() })
+
+	var journalMode string
+	if err := db.Raw("PRAGMA journal_mode").Scan(&journalMode).Error; err != nil {
+		t.Fatal(err)
+	}
+	if journalMode != "delete" {
+		t.Fatalf("journal_mode = %q, want delete", journalMode)
+	}
+	var busyTimeout int
+	if err := db.Raw("PRAGMA busy_timeout").Scan(&busyTimeout).Error; err != nil {
+		t.Fatal(err)
+	}
+	if busyTimeout != 5000 {
+		t.Fatalf("busy_timeout = %d, want 5000", busyTimeout)
+	}
+}