message: Implement SQLiteDatabase::Close
diff: @@ -161,6 +161,11 @@ bool SQLiteDatabase::Backup(const std::string& dest) const
  void SQLiteDatabase::Close()
  {
  + int res = sqlite3_close(m_db);
  + if (res != SQLITE_OK) {
  + throw std::runtime_error(strprintf("SQLiteDatabase: Failed to close database: %s\n", sqlite3_errstr(res)));
  + }
  + m_db = nullptr;
  }
  std::unique_ptr<DatabaseBatch> SQLiteDatabase::MakeBatch(bool flush_on_close)
  