Worked on stabilizing the Comb Search Index deletion workflow in the statamic/cms repository, focusing on backend reliability and efficiency. Addressed a bug where deleting a document could unnecessarily rewrite the JSON index even if the document reference was absent, leading to redundant file operations. Introduced existence checks in the PHP codebase to ensure the index is only rewritten when required, reducing input/output overhead and improving deletion reliability for sites of varying sizes. Emphasized robust unit testing to validate the fix and maintain stability on the 6.x branch, demonstrating careful attention to edge-case handling and backend development best practices.