feat: add elo tables for house ranking

dbt/models/marts/elo_sample_listings.sql

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+-- Mart: stable random sample of Funda listings for pairwise ELO comparison.
+-- Incrementally tops up to the target sample size using deterministic ordering.
+
+select l.global_id
+from {{ ref('funda_listings') }} as l
+{% if is_incremental() %}
+    left join {{ this }} as s on l.global_id = s.global_id
+    where s.global_id is null
+    order by md5(l.global_id)
+    limit greatest(0, 50 - (select count(*) from {{ this }}))
+{% else %}
+    order by md5(l.global_id)
+    limit 50
+{% endif %}

dbt/models/marts/elo_sample_listings.yml

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+version: 2
+
+models:
+  - name: elo_sample_listings
+    description: >
+      Stable random sample of Funda listings used for pairwise ELO comparison in the
+      house-elo-ranking application. Maintains up to 50 listings, topped up incrementally using
+      deterministic md5-based ordering.
+    config:
+      materialized: incremental
+      unique_key: global_id
+      on_schema_change: fail
+      schema: elo
+      contract:
+        enforced: true
+    meta:
+      dagster:
+        group: elo
+    columns:
+      - name: global_id
+        description: Funda internal listing ID, referencing funda_listings.
+        data_type: text
+        constraints:
+          - type: not_null
+          - type: unique
+        tests:
+          - unique
+          - not_null
+          - relationships:
+              to: ref('funda_listings')
+              field: global_id