Fix frame data records being created for non-ugoira posts.

* Prevent non-ugoira posts from getting dummy frame data records with
  all the columns set to null.
* Make `data` and `content_type` columns NOT NULL, since they should
  always be present.
* Remove the timestamps while we're at it, since they don't seem
  necessary for anything.

app/models/upload.rb

@@ -112,7 +112,7 @@ class Upload < ActiveRecord::Base
         post.distribute_files
         if post.save
           CurrentUser.increment!(:post_upload_count)
-          ugoira_service.process(post)
+          ugoira_service.process(post) if is_ugoira?
           update_attributes(:status => "completed", :post_id => post.id)
         else
           update_attribute(:status, "error: " + post.errors.full_messages.join(", "))

db/migrate/20141017231608_fix_pixiv_ugoira_frame_data.rb

@@ -0,0 +1,9 @@
+class FixPixivUgoiraFrameData < ActiveRecord::Migration
+  def change
+    change_table :pixiv_ugoira_frame_data do |t|
+      t.change :data,         :text,   :null => false
+      t.change :content_type, :string, :null => false
+      t.remove_timestamps
+    end
+  end
+end

db/structure.sql

@@ -2367,10 +2367,8 @@ ALTER SEQUENCE notes_id_seq OWNED BY notes.id;
 CREATE TABLE pixiv_ugoira_frame_data (
     id integer NOT NULL,
     post_id integer,
-    data text,
+    data text NOT NULL,
-    content_type character varying(255),
+    content_type character varying(255) NOT NULL
-    created_at timestamp without time zone,
-    updated_at timestamp without time zone
 );
 
 
@@ -7119,3 +7117,5 @@ INSERT INTO schema_migrations (version) VALUES ('20140725003232');
 
 INSERT INTO schema_migrations (version) VALUES ('20141009231234');
 
+INSERT INTO schema_migrations (version) VALUES ('20141017231608');
+