Combine migrations for solid_cache_entries

Combine the migrations for solid_cache_entries into a single file.

Author: djmb

db/migrate/20230724121448_create_solid_cache_entries.rb

@@ -1,11 +1,15 @@
-class CreateSolidCacheEntries < ActiveRecord::Migration[7.0]
+class CreateSolidCacheEntries < ActiveRecord::Migration[7.2]
   def change
     create_table :solid_cache_entries do |t|
       t.binary   :key,        null: false,   limit: 1024
       t.binary   :value,      null: false,   limit: 512.megabytes
       t.datetime :created_at, null: false
+      t.integer :key_hash,    null: false,    limit: 8
+      t.integer :byte_size,   null: false,    limit: 4
 
-      t.index    :key,        unique: true
+      t.index  :key_hash, unique: true
+      t.index  [:key_hash, :byte_size]
+      t.index  :byte_size
     end
   end
 end