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App lists almost always filter on status or soft-delete. A partial index keeps only hot rows: smaller, cheaper to maintain. EXPLAIN tells you if the planner can use it.

Copying signal into signal inside effect() is a classic footgun. Use computed() for derived state; linkedSignal() when it must stay writable.

A type annotation widens object literals. satisfies checks the shape and keeps narrow inference, so autocomplete and narrowing still work.