fix: correct logic for weather arts selection

- Update query to select weather arts with last generation time
  greater than the cutoff time.
- Adjust logging for clarity, including brackets around limits
  and counts for better readability.
- Change from appending to selected cities to concatenating selected
  cities, ensuring the full list is preserved.

This commit resolves an issue where the logic for filtering
recent weather arts was incorrect, potentially leading to missing
relevant entries. Additionally, it improves log output formatting
for better debugging.

app/workers/batch_generate_weather_arts_worker.rb

@@ -47,7 +47,7 @@ class BatchGenerateWeatherArtsWorker
           FROM weather_arts
           GROUP BY city_id
         ) latest_arts ON cities.id = latest_arts.city_id")
-        .where("latest_arts.last_generation_time < ?", cutoff_time)
+        .where("latest_arts.last_generation_time > ?", cutoff_time)
   end
 
   def calculate_remaining_slots
@@ -69,8 +69,8 @@ class BatchGenerateWeatherArtsWorker
   end
 
   def select_cities(recent_city, countries, limit)
-    Rails.logger.debug "Select Cities with limit: #{limit}, in #{countries.size} countries."
-    Rails.logger.debug "Skip Cities(count: #{recent_city.count}) list: #{recent_city.map(&:name).join(', ')}."
+    Rails.logger.debug "Select Cities with limit: [#{limit}], in [#{countries.size}] countries."
+    Rails.logger.debug "Skip Cities(count: [#{recent_city.count}]) list: [#{recent_city.map(&:name).join(', ')}]."
     # 第一阶段：筛选 active 城市, 排除最近生成过的城市
     active_cities = City.where.not(id: recent_city.pluck(:id))
                         .where(active: true, country_id: countries.map(&:id)).limit(limit).to_a
@@ -97,12 +97,12 @@ class BatchGenerateWeatherArtsWorker
               .first(remaining_every_country_count)
       if c.any? # 检查是否有有效的城市
         Rails.logger.debug "== Selected city [#{c.first.name}] in country: [#{country.name}]"
-        selected << c
+        selected += c
       else
         Rails.logger.debug "== No valid cities found in country: [#{country.name}]"
       end
     end
-    Rails.logger.debug "==recent selected city list: #{selected.map(&:name).join(', ')}."
+    Rails.logger.debug "==recent selected city list: #{selected.map(&:name).join(', ')}." if selected.any?
     Rails.logger.debug "Finished selected #{selected.size} cities."
     selected
   end