Mitigation of server problem with long strings as POV values

Summary

Mitigation for https://gitlab.com/linkahead/linkahead-server/-/issues/101, implements #125 (closed)

Focus

• Proper handling of ambiguities?
• No overly large performance impact?
• Test looks sufficient?

Test Environment

• Run the integration test: pytest ../integrationtests/test_issues.py -k 87

Check List for the Author

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
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  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

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