Add Eloverblik data pipeline: fetch metering points, readings, and charges to PostgreSQL

- Add eloverblik controller with API client for metering points, time series, and charges
- Add migrations for metering_points, meter_readings, and charges tables
- Add HugSQL queries (upsert-metering-point!, insert-meter-reading!, insert-charge!)
- Add POST /eloverblik/sync route to trigger sync from browser

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

resources/queries.sql

@@ -11,3 +11,39 @@ FROM day_ahead_prices
 WHERE time_dk::date = :date
   AND price_area = :price-area
 ORDER BY time_dk;
+
+-- :name upsert-metering-point! :! :n
+-- :doc Upsert a metering point, refreshing data on re-sync
+INSERT INTO metering_points (metering_point_id, type_of_mp, balance_supplier, street_name,
+  building_number, postcode, city_name, has_relation, settlement_method,
+  reading_occurrence, consumer_start_date, first_consumer_name)
+VALUES (:metering-point-id, :type-of-mp, :balance-supplier, :street-name,
+  :building-number, :postcode, :city-name, :has-relation, :settlement-method,
+  :reading-occurrence, :consumer-start-date, :first-consumer-name)
+ON CONFLICT (metering_point_id) DO UPDATE SET
+  type_of_mp = EXCLUDED.type_of_mp,
+  balance_supplier = EXCLUDED.balance_supplier,
+  street_name = EXCLUDED.street_name,
+  building_number = EXCLUDED.building_number,
+  postcode = EXCLUDED.postcode,
+  city_name = EXCLUDED.city_name,
+  has_relation = EXCLUDED.has_relation,
+  settlement_method = EXCLUDED.settlement_method,
+  reading_occurrence = EXCLUDED.reading_occurrence,
+  consumer_start_date = EXCLUDED.consumer_start_date,
+  first_consumer_name = EXCLUDED.first_consumer_name,
+  fetched_at = now();
+
+-- :name insert-meter-reading! :! :n
+-- :doc Insert a meter reading, skip if already exists
+INSERT INTO meter_readings (metering_point_id, time_dk, quantity_kwh, quality)
+VALUES (:metering-point-id, :time-dk, :quantity-kwh, :quality)
+ON CONFLICT (metering_point_id, time_dk) DO NOTHING;
+
+-- :name insert-charge! :! :n
+-- :doc Insert a charge record, skip if already exists
+INSERT INTO charges (metering_point_id, charge_type, name, description, owner,
+  valid_from_date, valid_to_date, period_type, price, quantity, position)
+VALUES (:metering-point-id, :charge-type, :name, :description, :owner,
+  :valid-from-date, :valid-to-date, :period-type, :price, :quantity, :position)
+ON CONFLICT (metering_point_id, charge_type, name, owner, valid_from_date, position) DO NOTHING;