fix: vulnerabilities prevent cvss score overwrite back to null (#3960)

Signed-off-by: anil <epipav@gmail.com>

Author: epipav

services/apps/git_integration/src/crowdgit/services/vulnerability_scanner/db.go

@@ -114,8 +114,8 @@ func (db *InsightsDB) saveVulnerabilities(ctx context.Context, repoURL string, v
 			scan_id           = EXCLUDED.scan_id,
 			status            = EXCLUDED.status,
 			fixed_version     = EXCLUDED.fixed_version,
-			severity          = EXCLUDED.severity,
-			cvss_score        = EXCLUDED.cvss_score,
+			severity          = CASE WHEN EXCLUDED.severity = 'UNKNOWN' THEN vulnerabilities.severity ELSE EXCLUDED.severity END,
+			cvss_score        = COALESCE(EXCLUDED.cvss_score, vulnerabilities.cvss_score),
 			summary           = EXCLUDED.summary,
 			details           = EXCLUDED.details,
 			cve_ids           = EXCLUDED.cve_ids,