feat: separate sql

backend/app/sql/count_comparisons.sql

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+select count(*) from {elo_schema}.comparisons

backend/app/sql/count_listings.sql

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+select count(*) from {listings_schema}.{listings_table}

backend/app/sql/count_rated.sql

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+select count(*) from {elo_schema}.ratings

backend/app/sql/elo_aggregates.sql

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+select
+    avg(elo_rating),
+    max(elo_rating),
+    min(elo_rating)
+from {elo_schema}.ratings

backend/app/sql/elo_distribution.sql

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+select
+    floor(elo_rating / 50) * 50 as bucket,
+    count(*) as count
+from {elo_schema}.ratings
+group by bucket
+order by bucket

backend/app/sql/history.sql

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+select
+    c.*,
+    a.title as listing_a_title,
+    b.title as listing_b_title,
+    w.title as winner_title
+from {elo_schema}.comparisons as c
+left join {listings_schema}.{listings_table} as a
+    on c.listing_a_id = a.global_id
+left join {listings_schema}.{listings_table} as b
+    on c.listing_b_id = b.global_id
+left join {listings_schema}.{listings_table} as w
+    on c.winner_id = w.global_id
+order by c.created_at desc
+limit :limit

backend/app/sql/listing_images.sql

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+select
+    raw_json -> 'photo_urls' as photo_urls
+from {images_schema}.{images_table}
+where global_id = :gid

backend/app/sql/listing_select.sql

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+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

backend/app/sql/recent_pairs.sql

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+select
+    listing_a_id,
+    listing_b_id
+from {elo_schema}.comparisons
+order by created_at desc
+limit 20