fix: 修复写队列 busy 恢复、关闭安全、备份与配置构建问题

internal/store/migrate_test.go

@@ -0,0 +1,73 @@
+package store
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+	"time"
+)
+
+func TestFailingMigrationReusesBackup(t *testing.T) {
+	t.Parallel()
+	dir := t.TempDir()
+
+	db, err := Open(dir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	_ = db.Close()
+
+	w, err := OpenWriter(dir, "FULL")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer func() { _ = w.Close() }()
+
+	pending := []migrationFile{{
+		version: 9999,
+		name:    "9999_fail.sql",
+		body:    "THIS IS NOT VALID SQL",
+	}}
+	if err := applyPending(w, dir, true, pending); err == nil {
+		t.Fatal("expected first failing migration to error")
+	}
+	backupDir := filepath.Join(dir, "backup")
+	first, err := os.ReadDir(backupDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(first) != 1 || first[0].Name() != "pre-migrate-v2-to-v9999.db" {
+		t.Fatalf("first backups=%v", dirNames(first))
+	}
+
+	if err := applyPending(w, dir, true, pending); err == nil {
+		t.Fatal("expected second failing migration to error")
+	}
+	second, err := os.ReadDir(backupDir)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(second) != 1 || second[0].Name() != first[0].Name() {
+		t.Fatalf("second backups=%v first=%v", dirNames(second), dirNames(first))
+	}
+	info1, err := first[0].Info()
+	if err != nil {
+		t.Fatal(err)
+	}
+	info2, err := second[0].Info()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info2.ModTime().After(info1.ModTime().Add(time.Second)) && info2.Size() != info1.Size() {
+		// 复用同一文件即可；时钟精度下允许 mtime 相同。
+		t.Logf("mtime first=%s second=%s", info1.ModTime(), info2.ModTime())
+	}
+}
+
+func dirNames(entries []os.DirEntry) []string {
+	out := make([]string, 0, len(entries))
+	for _, e := range entries {
+		out = append(out, e.Name())
+	}
+	return out
+}