Function fsyncFileIfExists

apps/local/src/db/v1-v2-migration.ts:1059–1079

(path: string)

};

const fsyncFileIfExists = (path: string): void => {
  if (!fs.existsSync(path)) return;
  // Windows FlushFileBuffers requires a writable handle, so fsync on a
  // read-only ("r") fd throws EPERM and would crash the v1->v2 migration at
  // boot. Open read-write for the flush, and treat fsync as best-effort
  // durability hardening (the rename/copy already wrote the bytes) so a
  // platform or filesystem that refuses the flush does not fail the migration.
  let fd: number;
  try {
    fd = fs.openSync(path, "r+");
  } catch {
    return;
  }
  try {
    fs.fsyncSync(fd);
  } catch {
    // best-effort: some platforms/filesystems refuse fsync on certain handles
  } finally {
    fs.closeSync(fd);
  }
};

const fsyncDirectory = (path: string): void => {
  try {