Günlük Hava Durumu — the overwritten row and the frozen row are kept apart
A site publishing weather and climate data. The real decision here is a schema decision: how long a row lives. The forecast row is live, so it refreshes and the value shown is overwritten at the next update. The moment its date passes, the row changes sides. It moves into the archive, is written once and never edited again, and a measured day replaces the forecast. The climate view is not a third source; it is computed over the archived days, so it shifts as the archive deepens. Every day and every location stays published at its own permanent address.
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