feat: separate sql

backend/app/sql/listing_select.sql

@@ -0,0 +1,40 @@
+select
+    l.global_id,
+    l.tiny_id,
+    l.url,
+    l.title,
+    l.city,
+    l.postcode,
+    l.province,
+    l.neighbourhood,
+    l.municipality,
+    l.latitude,
+    l.longitude,
+    l.object_type,
+    l.house_type,
+    l.offering_type,
+    l.construction_type,
+    l.construction_year,
+    l.energy_label,
+    l.living_area,
+    l.plot_area,
+    l.bedrooms,
+    l.rooms,
+    l.has_garden,
+    l.has_balcony,
+    l.has_solar_panels,
+    l.has_heat_pump,
+    l.has_roof_terrace,
+    l.is_energy_efficient,
+    l.is_monument,
+    l.current_price,
+    l.status,
+    l.price_per_sqm,
+    l.publication_date,
+    coalesce(r.elo_rating, :default_elo) as elo_rating,
+    coalesce(r.comparison_count, 0) as comparison_count,
+    coalesce(r.wins, 0) as wins,
+    coalesce(r.losses, 0) as losses
+from {listings_schema}.{listings_table} as l
+left join {elo_schema}.ratings as r
+    on l.global_id = r.global_id