One evening, a power outage swept the block into darkness. The terminal’s backup battery kept blinking, then went still. Customers worried about lost records and lost luck. Mariana lit a candle, closed the shop for a minute, and returned with a ledger. She began to write—neat, inked entries with names, items, and promise: “Factura to be generated when power returns.” The gesture felt old-world and radical at once. People left with handwritten proof that someone had seen their purchase and cared.