message: Implement SQLiteDatabase::Rewrite
  Rewrite uses the VACUUM command which does exactly what we want. A
  specific advertised use case is to compact a database and ensure that
  any deleted data is actually deleted.
diff: @@ -181,7 +181,9 @@ void SQLiteDatabase::Open()
  bool SQLiteDatabase::Rewrite(const char* skip)
  {
  - return false;
  + // Rewrite the database using the VACUUM command: https://sqlite.org/lang_vacuum.html
  + int ret = sqlite3_exec(m_db, "VACUUM", nullptr, nullptr, nullptr);
  + return ret == SQLITE_OK;
  }
  bool SQLiteDatabase::Backup(const std::string& dest) const
  