Consider a production Laravel application that needs to use Where clauses. How should the developer approach the requirement, and what should be checked before releasing it?

Consider a production Laravel application that needs to use Where clauses. How should the developer approach the requirement, and what should be checked before releasing it? Assume the system receives real users, real data and concurrent requests. The correct approach is to identify where where clauses belongs, define its inputs and outputs, protect the boundary with validation and authorization where applicable, consider database and performance implications, and add automated tests for the expected behavior. Concept-specific reasoning: Where conditions restrict rows according to values, ranges and other query predicates. A useful implementation pattern is: $totals = DB::table('orders') ->where('status', 'paid') ->sum('amount');