[DOP-37944] Make address.url unique

[dolfinus]

Change Summary

Related issue number

Checklist

• Commit message and PR title is comprehensive
• Keep the change as small as possible
• Unit and integration tests for the changes exist
• Tests pass on CI and coverage does not decrease
• Documentation reflects the changes where applicable
• docs/changelog/next_release/<pull request or issue id>.<change type>.rst file added describing change
  (see CONTRIBUTING.rst for details.)
• My PR is ready to review.

[github-actions]

Coverage Report •

File	Stmts	Miss	Branch	BrPart	Cover	Missing
data_rentgen/db/migrations/versions
2025-09-16_17481d3b2466_make_unique_names_case_insensitive.py	25	25	0	0	0%	11–12, 15–18, 21–24, 26, 32–34, 36, 42–44, 46–47, 49, 55–56, 58–59
2026-06-25_d6581268ce06_make_address_url_unique.py	9	9	0	0	0%	11, 14–17, 20–23
TOTAL	8174	1039	1302	226	87%