fix: persist docker sqlite settings path

config/config_test.go

@@ -0,0 +1,33 @@
+package config
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestNormalizeDockerSQLiteDSNUsesMountedDataDir(t *testing.T) {
+	root := t.TempDir()
+	appDataDir := filepath.Join(root, "data")
+	if err := os.MkdirAll(appDataDir, 0755); err != nil {
+		t.Fatal(err)
+	}
+	Cfg = Config{StorageDriver: "sqlite", DatabaseDSN: "data/infinite-canvas.db?_pragma=busy_timeout(5000)"}
+
+	normalizeDockerSQLiteDSN(appDataDir)
+
+	want := filepath.Join(root, "data", "infinite-canvas.db") + "?_pragma=busy_timeout(5000)"
+	if Cfg.DatabaseDSN != want {
+		t.Fatalf("DatabaseDSN = %q, want %q", Cfg.DatabaseDSN, want)
+	}
+}
+
+func TestNormalizeDockerSQLiteDSNLeavesLocalPathWithoutMountedDataDir(t *testing.T) {
+	Cfg = Config{StorageDriver: "sqlite", DatabaseDSN: "data/infinite-canvas.db"}
+
+	normalizeDockerSQLiteDSN(filepath.Join(t.TempDir(), "missing-data"))
+
+	if Cfg.DatabaseDSN != "data/infinite-canvas.db" {
+		t.Fatalf("DatabaseDSN = %q, want relative local path", Cfg.DatabaseDSN)
+	}
+}