Function cache_key 

pub fn cache_key(
    repo_owner: &str,
    repo_name: &str,
    file_path: &str,
    pattern_id: &str,
    matched_text: &str,
) -> String

Generate a cache key for a security finding.

Creates a SHA-256 hash of the concatenated components: {repo_owner}/{repo_name}:{file_path}:{pattern_id}:{matched_text}

Uses incremental hashing to avoid allocating a large intermediate string, which is more memory-efficient when matched_text contains large code snippets.

This ensures that identical findings across scans are cached, while different contexts (repo, file, pattern, or code) produce unique keys.

Arguments

• repo_owner - Repository owner (e.g., “octocat”)
• repo_name - Repository name (e.g., “hello-world”)
• file_path - File path where finding was detected
• pattern_id - Pattern ID that matched
• matched_text - The matched code snippet

Returns

A 64-character hexadecimal SHA-256 hash.