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The Reports page expects structured objects from the API (e.g. summary with nested revenue/appointments fields, revenue with byPeriod/byGroomer, etc.). Returning a bare [] caused runtime errors when the component accessed properties like apptData.byPeriod, crashing the React tree and making "Groom Book" disappear from the DOM on retries. Co-Authored-By: Paperclip <noreply@paperclip.ing>