feat: revise funda data process

dbt/models/marts/funda_city_stats.sql

@@ -1,29 +0,0 @@
--- 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_city_stats.yml

@@ -1,64 +0,0 @@
-version: 2
-
-models:
-  - name: funda_city_stats
-    description: >
-      Aggregated price statistics per city, province, offering type and object type. Only includes
-      currently available (not sold) listings.
-    config:
-      contract:
-        enforced: true
-    meta:
-      dagster:
-        group: funda
-    columns:
-      - name: city
-        description: City name.
-        data_type: text
-        constraints:
-          - type: not_null
-        tests:
-          - not_null
-      - name: province
-        description: Province name.
-        data_type: text
-      - name: offering_type
-        description: Buy or rent.
-        data_type: text
-        constraints:
-          - type: not_null
-        tests:
-          - not_null
-      - name: object_type
-        description: Property type.
-        data_type: text
-      - name: listing_count
-        description: Number of active listings in this group.
-        data_type: bigint
-        constraints:
-          - type: not_null
-        tests:
-          - not_null
-          - dbt_utils.expression_is_true:
-              expression: "> 0"
-      - name: avg_price
-        description: Average asking price.
-        data_type: numeric
-      - name: min_price
-        description: Lowest asking price in this group.
-        data_type: bigint
-      - name: max_price
-        description: Highest asking price in this group.
-        data_type: bigint
-      - name: median_price
-        description: Median asking price.
-        data_type: double precision
-      - name: avg_price_per_sqm
-        description: Average price per square metre.
-        data_type: numeric
-      - name: avg_living_area
-        description: Average living area in m².
-        data_type: numeric
-      - name: avg_bedrooms
-        description: Average number of bedrooms.
-        data_type: numeric

dbt/models/marts/funda_listings.sql

@@ -1,8 +1,20 @@
 -- Mart: analysis-ready Funda listings table.
--- Selects the most useful fields and adds derived metrics.
+-- Incrementally loads enriched listings, updating existing rows on re-ingestion.
+
+{{
+    config(
+        materialized='incremental',
+        unique_key='global_id',
+        on_schema_change='fail'
+    )
+}}
 
 with enriched as (
-    select * from {{ ref('int_funda_listings_enriched') }}
+    select *
+    from {{ ref('int_funda_listings_enriched') }}
+    {% if is_incremental() %}
+        where ingested_at > (select max(ingested_at) from {{ this }})  -- noqa: RF02
+    {% endif %}
 ),
 
 final as (

dbt/models/staging/sources.yml

@@ -10,7 +10,7 @@ sources:
         description: Funda search results (broad overview of matching listings).
         meta:
           dagster:
-            asset_key: ["funda_search_results"]
+            asset_key: ["raw_funda_search_results"]
         loaded_at_field: last_seen_at
         freshness:
           warn_after: { count: 12, period: hour }
@@ -51,7 +51,7 @@ sources:
           Full listing details fetched per search result (50+ fields).
         meta:
           dagster:
-            asset_key: ["funda_listing_details"]
+            asset_key: ["raw_funda_listing_details"]
         loaded_at_field: last_fetched_at
         freshness:
           warn_after: { count: 25, period: hour }
@@ -96,7 +96,7 @@ sources:
           Historical price data per listing (asking prices, WOZ, sales).
         meta:
           dagster:
-            asset_key: ["funda_price_history"]
+            asset_key: ["raw_funda_price_history"]
         loaded_at_field: ingested_at
         freshness:
           warn_after: { count: 25, period: hour }