fix: bigint validation (backport #25733)

[mergify]

• fix: invlaid integer validations for biging
• fix(DX): annotate chainable methods with Self return

---

This is an automatic backport of pull request #25733 done by [Mergify](https://mergify.com).

[mergify]

Cherry-pick of b493bfe has failed:

On branch mergify/bp/version-14-hotfix/pr-25733
Your branch is ahead of 'origin/version-14-hotfix' by 1 commit.
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You are currently cherry-picking commit b493bfe7c2.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/model/document.py

no changes added to commit (use "git add" and/or "git commit -a")

Cherry-pick of eef9c2c has failed:

On branch mergify/bp/version-14-hotfix/pr-25733
Your branch is ahead of 'origin/version-14-hotfix' by 2 commits.
  (use "git push" to publish your local commits)

You are currently cherry-picking commit eef9c2c8cc.
  (fix conflicts and run "git cherry-pick --continue")
  (use "git cherry-pick --skip" to skip this patch)
  (use "git cherry-pick --abort" to cancel the cherry-pick operation)

Changes to be committed:
	modified:   frappe/database/mariadb/database.py
	modified:   frappe/database/mariadb/framework_mariadb.sql
	modified:   frappe/database/postgres/database.py
	modified:   frappe/tests/test_db_update.py

Unmerged paths:
  (use "git add <file>..." to mark resolution)
	both modified:   frappe/database/mariadb/schema.py

To fix up this pull request, you can check it out locally. See documentation: https://docs.github.com/en/pull-requests/collaborating-with-pull-requests/reviewing-changes-in-pull-requests/checking-out-pull-requests-locally

[frappe-pr-bot]

🎉 This PR is included in version 14.71.0 🎉

The release is available on GitHub release

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