feat: expand dbt models

dbt/models/marts/funda_city_stats.sql

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+-- Mart: per-city price statistics for available listings.
+
+with listings as (
+    select * from {{ ref('funda_listings') }}
+    where not is_sold
+),
+
+city_stats as (
+    select
+        city,
+        province,
+        offering_type,
+        object_type,
+        count(*) as listing_count,
+        round(avg(current_price), 0) as avg_price,
+        min(current_price) as min_price,
+        max(current_price) as max_price,
+        percentile_cont(0.5) within group (
+            order by current_price
+        ) as median_price,
+        round(avg(price_per_sqm), 0) as avg_price_per_sqm,
+        round(avg(living_area), 0) as avg_living_area,
+        round(avg(bedrooms), 1) as avg_bedrooms
+    from listings
+    where current_price is not null
+    group by city, province, offering_type, object_type
+)
+
+select * from city_stats

dbt/models/marts/funda_listings.sql

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+-- Mart: analysis-ready Funda listings table.
+-- Selects the most useful fields and adds derived metrics.
+
+with enriched as (
+    select * from {{ ref('int_funda_listings_enriched') }}
+),
+
+final as (
+    select
+        -- identifiers
+        global_id,
+        tiny_id,
+        url,
+
+        -- location
+        title,
+        city,
+        postcode,
+        province,
+        neighbourhood,
+        municipality,
+        latitude,
+        longitude,
+
+        -- property characteristics
+        object_type,
+        house_type,
+        offering_type,
+        construction_type,
+        construction_year,
+        energy_label,
+        living_area,
+        plot_area,
+        bedrooms,
+        rooms,
+        has_garden,
+        has_balcony,
+        has_solar_panels,
+        has_heat_pump,
+        has_roof_terrace,
+        is_energy_efficient,
+        is_monument,
+
+        -- pricing
+        price as current_price,
+        latest_asking_price,
+        latest_asking_date,
+        sold_price,
+        sold_date,
+        is_sold,
+
+        -- derived
+        photo_count,
+
+        -- engagement
+        views,
+        saves,
+        status,
+
+        -- meta
+        publication_date,
+        ingested_at,
+        case
+            when living_area > 0 then round(price::numeric / living_area, 0)
+        end as price_per_sqm
+    from enriched
+)
+
+select * from final

dbt/models/marts/funda_listings.yml

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+version: 2
+
+models:
+  - name: funda_listings
+    description: >
+      Analysis-ready Funda listings table. One row per listing, enriched with price history, derived
+      metrics like price per sqm, and all cleaned fields from staging.
+    meta:
+      dagster:
+        group: funda
+    columns:
+      - name: global_id
+        description: Funda internal listing ID.
+        tests:
+          - unique
+          - not_null
+      - name: current_price
+        description: Current asking or rental price in euros.
+      - name: price_per_sqm
+        description: Current price divided by living area in m².
+      - name: is_sold
+        description: True when a sold price event exists for this listing.
+      - name: sold_price
+        description: Final sold price, null if still available.
+      - name: sold_date
+        description: Date sold, null if still available.
+
+  - name: funda_city_stats
+    description: >
+      Aggregated price statistics per city, province, offering type and object type. Only includes
+      currently available (not sold) listings.
+    meta:
+      dagster:
+        group: funda
+    columns:
+      - name: city
+        description: City name.
+        tests:
+          - not_null
+      - name: listing_count
+        description: Number of active listings in this group.
+      - name: avg_price
+        description: Average asking price.
+      - name: median_price
+        description: Median asking price.
+      - name: avg_price_per_sqm
+        description: Average price per square metre.