Add index for post warehousing tasks

app/models/post_frames.rb

@@ -137,6 +137,7 @@ class PostFrames < ApplicationRecord
   # Warehouse frames.  Only frames which are created and finalized will be warehoused.
   def self.warehouse_frames(update_status = nil)
     # Find a post with frames that need warehousing.
+    # This SQL is designed to use the post_frames_for_warehouse.
     post = Post.find_by("frames = frames_pending AND frames <> '' AND NOT frames_warehoused")
     return false if post.nil?
 

db/migrate/20201103140508_add_post_warehouse_index.rb

@@ -0,0 +1,7 @@
+class AddPostWarehouseIndex < ActiveRecord::Migration[6.0]
+  def change
+    add_index :posts, :id,
+      name: 'post_frames_for_warehouse',
+      where: "frames = frames_pending AND frames <> '' AND NOT frames_warehoused"
+  end
+end

db/structure.sql

@@ -2639,6 +2639,13 @@ CREATE INDEX pools_posts_post_id_idx ON public.pools_posts USING btree (post_id)
 CREATE INDEX pools_user_id_idx ON public.pools USING btree (user_id);
 
 
+--
+-- Name: post_frames_for_warehouse; Type: INDEX; Schema: public; Owner: -
+--
+
+CREATE INDEX post_frames_for_warehouse ON public.posts USING btree (id) WHERE ((frames = frames_pending) AND (frames <> ''::text) AND (NOT frames_warehoused));
+
+
 --
 -- Name: post_frames_out_of_date; Type: INDEX; Schema: public; Owner: -
 --
@@ -3400,6 +3407,7 @@ INSERT INTO "schema_migrations" (version) VALUES
 ('20190817070727'),
 ('20191110172526'),
 ('20200908180652'),
+('20201103140508'),
 ('21'),
 ('22'),
 ('23'),