Root cause: 50k+ invoices had insurance_case_id='0', and MySQL string comparison '0'='C26060004997' matched (both convert to numeric 0).
Fix: Exclude NULL/empty/'0' insurance_case_id before comparison in:
- getOrganizationCaseInvoiceRows() union query
- updateOrgTotals() aggregate queries
Result: Case C26060004997 now returns 9 rows instead of 56,786 (memory crash fixed)