How a Simple Count Check Can Prevent Silent Data Loss in Reorder APIs

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When building a drag-and-drop reorder feature, the server receives a new item order as an array of IDs and rearranges existing data accordingly. A two-step approach — placing items in the specified order, then appending any uncovered items — can introduce subtle bugs such as duplicated or missing entries. To guard against this, a sanity check compares the input and output item counts before writing the result to disk. If the counts do not match, the write is aborted and an error is logged with both figures. This lightweight invariant check does not replace thorough testing but serves as a last-resort safeguard against data corruption caused by edge cases in complex reorder logic.

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