test:Add database migration service with normalization and masking functions

- Implemented `normalizeMigrationInput` to standardize database migration input for sqlite, mysql, and postgres.
- Added `maskConnectionString` to obscure sensitive credentials in connection strings.
- Created comprehensive tests for migration input normalization and connection string masking.
- Established database schema creation logic for multiple dialects (sqlite, mysql, postgres).
- Developed functions for managing database transactions, including begin, commit, and rollback.
- Implemented data insertion logic from backup snapshots into the target database.

src/server/services/backgroundTaskService.ts

@@ -80,9 +80,9 @@ function setTaskStatus(task: BackgroundTask, patch: Partial<BackgroundTask>) {
   return next;
 }
 
-function appendTaskEvent(level: 'info' | 'warning' | 'error', title: string, message: string, taskId: string) {
+async function appendTaskEvent(level: 'info' | 'warning' | 'error', title: string, message: string, taskId: string) {
   try {
-    db.insert(schema.events).values({
+    await db.insert(schema.events).values({
       type: 'status',
       title,
       message,