fix(user): migrate lastReultHashes typo to lastResultHashes safely (@mukundangopalachary)

[mukundangopalachary]

Description

This PR fixes a typo in the user hashes field used for duplicate-result detection.

Problem:

• The codebase used a misspelled key: lastReultHashes.
• This creates long-term schema/DB inconsistency and makes future updates risky.

Repro (before this change):

1. Inspect user schema and backend result logic.
2. Notice reads/writes use lastReultHashes (typo) instead of lastResultHashes.
3. Any new code using the correct key would not align with existing data shape.

Approach:

• Read from both keys for backward compatibility:
  • lastResultHashes ?? lastReultHashes ?? []
• Write to the corrected key lastResultHashes.
• Unset legacy key lastReultHashes during updates.
• Keep both keys in schema for compatibility during migration.
• Exclude both keys from relevant user response shaping.

Checks

• Check if any open issues are related to this PR; if so, be sure to tag them below.
• Make sure the PR title follows the Conventional Commits standard. (https://www.conventionalcommits.org for more info)
• Make sure to include your GitHub username prefixed with @ inside parentheses at the end of the PR title.
  Closes #
  Suggested PR title format (per their rule):
• fix(user): migrate lastReultHashes to lastResultHashes safely (@mukundangopalachary)

[Copilot]

Pull request overview

Fixes a long-standing typo in the user document field used for duplicate-result detection, while keeping backward compatibility with existing MongoDB data.

Changes:

• Add correct lastResultHashes alongside legacy lastReultHashes in the shared UserSchema.
• Update backend write-path to write lastResultHashes and unset lastReultHashes.
• Update backend read-path to fallback lastResultHashes ?? lastReultHashes ?? [] and exclude both from user response shaping.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
packages/schemas/src/users.ts	Adds lastResultHashes while retaining legacy lastReultHashes for compatibility.
backend/src/dal/user.ts	Migrates writes to lastResultHashes and unsets legacy key during updates.
backend/src/api/controllers/user.ts	Ensures neither hash field is included in “relevant user info” responses.
backend/src/api/controllers/result.ts	Reads from corrected key first, then legacy, for duplicate detection.

[fehmer]

hi @mukundangopalachary, thank you for your contribution.

This topic keeps popping up in PRs so I guess we should fix it.

To tackle this without doing an database migration lets do the following:

• move the lastResultHashesfrom the UserSchema to DBUser. Frontend is not using this property
• dal writes to the new property, removing the old one (as you already did)
• add the soft-migration to UserDal.migrateUser

function migrateUser<
  T extends Pick<DBUser, "personalBests" | "lastResultHashes">,
>(user: T): T {
  user.personalBests ??= {
    time: {},
    words: {},
    quote: {},
    zen: {},
    custom: {},
  };

  if ("lastReultHashes" in user) {
    user.lastResultHashes = user.lastReultHashes as string[];
  }

  return user;
}

[fehmer]

lastResultHashes is not used on the frontend. We should just remove it here and move it to the DBUsertype.

[fehmer]

this is obsolete when we move the property to the DBUser