Fetch prices from elprisenligenu.dk

Swap the Energi Data Service datasets (DayAheadPrices + Elspotprices)
for elprisenligenu.dk's public hourly JSON API. The new source covers
both historical and post-2025 dates — previously, Elspotprices was
empty for all 2026 dates and DayAheadPrices was scoped to tomorrow
only, leaving days like 2026-04-07 uncovered.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

src/clj/pmagnus/elprice/web/controllers/elprice.clj

@@ -5,8 +5,7 @@
     [pmagnus.elprice.web.controllers.tariffs :as tariffs])
   (:import
     (java.net
-      URI
-      URLEncoder)
+      URI)
     (java.net.http
       HttpClient
       HttpRequest
@@ -15,27 +14,16 @@
       Timestamp)
     (java.time
       LocalDate
-      LocalDateTime
-      ZoneId)
-    (java.time.format
-      DateTimeFormatter)))
+      LocalDateTime)))
 
 
-(def ^:private dk-zone (ZoneId/of "Europe/Copenhagen"))
-(def ^:private date-fmt (DateTimeFormatter/ofPattern "yyyy-MM-dd"))
 (def ^:private eur-dkk-rate 7.46)
 
 
-(defn- build-url
-  [^LocalDate date]
-  (let [start (.format date date-fmt)
-        end   (.format (.plusDays date 1) date-fmt)]
-    (str "https://api.energidataservice.dk/dataset/DayAheadPrices"
-         "?start=" start
-         "&end=" end
-         "&filter=" (URLEncoder/encode (json/write-str {"PriceArea" ["DK1" "DK2"]}) "UTF-8")
-         "&sort=TimeDK%20asc"
-         "&limit=200")))
+(defn- elprisen-url
+  [^LocalDate date area]
+  (format "https://www.elprisenligenu.dk/api/v1/prices/%04d/%02d-%02d_%s.json"
+          (.getYear date) (.getMonthValue date) (.getDayOfMonth date) area))
 
 
 (defn- fetch-json
@@ -63,11 +51,29 @@
       (when price-eur (* price-eur eur-dkk-rate))))
 
 
+(defn- fetch-area
+  "Fetch hourly prices for one price area from elprisenligenu.dk."
+  [^LocalDate date area]
+  (let [url     (elprisen-url date area)
+        _       (log/info "Fetching" url)
+        records (fetch-json url)]
+    (when (sequential? records)
+      (map (fn [r]
+             ;; time_start is "YYYY-MM-DDTHH:MM:SS+HH:MM" already in DK local;
+             ;; drop the 6-char offset suffix, keep the naive wall-clock stamp.
+             (let [ts (subs (:time_start r) 0 19)]
+               {:time-dk ts
+                :area    area
+                :dkk     (some-> (:DKK_per_kWh r) (* 1000.0))  ; kWh → MWh
+                :eur     (some-> (:EUR_per_kWh r) (* 1000.0))}))
+           records))))
+
+
 (defn- fetch-from-api
+  "Fetch hourly prices for both DK1 and DK2 from elprisenligenu.dk."
   [^LocalDate date]
-  (let [url (build-url date)]
-    (log/info "Fetching el prices for" (.format date date-fmt) "from" url)
-    (:records (fetch-json url))))
+  (concat (fetch-area date "DK1")
+          (fetch-area date "DK2")))
 
 
 (defn- tariff-dkk-mwh
@@ -79,13 +85,13 @@
 (defn- save-records!
   [query-fn records]
   (doseq [rec records]
-    (when-let [dkk (dkk-price (:DayAheadPriceDKK rec) (:DayAheadPriceEUR rec))]
-      (let [ts     (parse-timestamp (:TimeDK rec))
+    (when-let [dkk (dkk-price (:dkk rec) (:eur rec))]
+      (let [ts     (parse-timestamp (:time-dk rec))
             tariff (tariff-dkk-mwh (.toLocalDateTime ^Timestamp ts))
             total  (+ (double dkk) tariff)]
         (query-fn :insert-elprice!
                   {:time-dk    ts
-                   :price-area (:PriceArea rec)
+                   :price-area (:area rec)
                    :price-dkk  dkk
                    :tariff-dkk tariff
                    :total-dkk  total})))))