Prevent PostgreSQL RLS Tenant Leaks with Connection Pools
Set PostgreSQL tenant context locally inside the same transaction and pooled connection that runs tenant queries, then always release the client safely.
Month: October 2026
Scope Redis Cache Keys Safely in Multi-Tenant SaaS
Enforce tenant-prefixed Redis keys behind one cache wrapper and understand where shared-instance eviction still crosses tenant boundaries.
Validate JPG and JPEG Uploads with PHP Fileinfo
Validate an uploaded image by its detected MIME type and an explicit extension map instead of assuming image/jpeg must use one filename extension.
Find Access Records That Exist in Two Locations
Use two correlated EXISTS tests in Microsoft Access to return each item only when it is associated with both selected locations.
Diagnose Why SQL Server PSP Does Not Create Query Variants
Check SQL Server compatibility, parameter sniffing, predicate eligibility, statistics, and Extended Events when PSP does not create query variants.