Split current conditions condition code querying

internal/adapters/outbound/postgres/conditions_queries.go

@@ -12,7 +12,6 @@ WITH windowed AS (
     relative_humidity_percent,
     wind_speed_kmh,
     wind_direction_degrees,
-    condition_code,
     is_day,
     observed_at
   FROM observations
@@ -39,7 +38,6 @@ SELECT
       AVG(cosd(wind_direction_degrees))
     )
   END AS wind_direction_degrees,
-  MAX(condition_code) AS condition_code,
   (
     SELECT is_day
     FROM windowed
@@ -47,4 +45,23 @@ SELECT
     LIMIT 1
   ) AS is_day
 FROM windowed`
+
+	queryCurrentConditionsConditionCodeCandidates = `
+WITH ranked AS (
+  SELECT
+    event_source,
+    condition_code,
+    ROW_NUMBER() OVER (
+      PARTITION BY event_source
+      ORDER BY observed_at DESC, event_emitted_at DESC
+    ) AS source_rank
+  FROM observations
+  WHERE observed_at > CURRENT_TIMESTAMP - make_interval(mins => $1)
+)
+SELECT
+  event_source,
+  condition_code
+FROM ranked
+WHERE source_rank = 1
+ORDER BY event_source`
 )