fix: updating char lenghth

[TEJASNARAYANS]

What Changed?

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Why?

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How to Test?

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Checklist

• I have read the CONTRIBUTING.md guide.
• My code follows the project's style guidelines.
• I have added tests that prove my fix is effective or my feature works.
• I have updated documentation where needed.

[greptile-apps]

Greptile Summary

This PR raises the metric-rubric text limit from 32,000 to 1,000,000 characters, applies the shared limit to standalone metric descriptions, and expands boundary validation tests.

• Consolidates the rubric-size constant and applies it consistently across metric create, update, and child schemas.
• Adds acceptance tests at the new boundary and rejection tests immediately above it.
• The accepted size can exceed downstream LLM context limits because evaluation prompts have no corresponding aggregate size guard.

Confidence Score: 4/5

The PR should not merge until accepted rubric sizes are bounded for downstream evaluation prompts or oversized prompts are handled explicitly.

Metric payloads near the new limit pass API validation and persistence but are inserted into bounded LLM contexts without aggregate prompt-size enforcement, so later evaluations can fail despite the metric being accepted.

Files Needing Attention: app/models/schemas.py

Important Files Changed

Filename	Overview
app/models/schemas.py	Raises rubric fields to a one-million-character validation limit, allowing persisted metrics that can overflow downstream evaluation prompts.
tests/test_models/test_metric_rubric_max_length.py	Expands coverage across standalone, hierarchical, and update schemas at and above the shared boundary.

_{Reviews (1): Last reviewed commit: "fix: updating char lenghth" | Re-trigger Greptile}