Changes again

server-rs/src/data/property.rs

@@ -538,6 +538,21 @@ impl PropertyData {
             Ok(joined)
         };
         let listings_buy = load_listings(listings_buy_path, "buy")?;
+        // Derive "Asking price per sqm" if not already present
+        let listings_buy = if listings_buy.schema().get("Asking price per sqm").is_none() {
+            listings_buy
+                .lazy()
+                .with_column(
+                    (col("Asking price").cast(DataType::Float64)
+                        / col("Total floor area (sqm)"))
+                    .round(0)
+                    .alias("Asking price per sqm"),
+                )
+                .collect()
+                .context("Failed to derive Asking price per sqm")?
+        } else {
+            listings_buy
+        };
         let listings_rent = load_listings(listings_rent_path, "rent")?;
 
         // Concatenate all rows into a single DataFrame