Store manga ID with subscriptions

src/plugin/subscriptions.cr

@@ -54,12 +54,13 @@ struct Subscription
 
   property id : String
   property plugin_id : String
+  property manga_id : String
   property name : String
   property created_at : Int64
   property last_checked : Int64
   property filters = [] of Filter
 
-  def initialize(@plugin_id, @name)
+  def initialize(@plugin_id, @manga_id, @name)
     @id = UUID.random.to_s
     @created_at = Time.utc.to_unix
     @last_checked = Time.utc.to_unix

src/routes/api.cr

@@ -629,12 +629,13 @@ struct APIRouter
     post "/api/admin/plugin/subscriptions" do |env|
       begin
         plugin_id = env.params.json["plugin"].as String
+        manga_id = env.params.json["manga"].as String
         filters = env.params.json["filters"].as(Array(JSON::Any)).map do |f|
           Filter.from_json f.to_json
         end
         name = env.params.json["name"].as String
 
-        sub = Subscription.new plugin_id, name
+        sub = Subscription.new plugin_id, manga_id, name
         sub.filters = filters
 
         plugin = Plugin.new plugin_id