fix length on session table index

db/migrate/20170421195415_add_index_to_token_hashes_on_authie_sessions.authie.rb

@@ -1,6 +1,6 @@
 # This migration comes from authie (originally 20170421174100)
 class AddIndexToTokenHashesOnAuthieSessions < ActiveRecord::Migration
   def change
-    add_index :authie_sessions, :token_hash
+    add_index :authie_sessions, :token_hash, :length => 8
   end
 end

db/schema.rb

@@ -53,7 +53,7 @@ ActiveRecord::Schema.define(version: 20170421195415) do
     t.string   "token_hash"
     t.index ["browser_id"], name: "index_authie_sessions_on_browser_id", length: { browser_id: 8 }, using: :btree
     t.index ["token"], name: "index_authie_sessions_on_token", length: { token: 8 }, using: :btree
-    t.index ["token_hash"], name: "index_authie_sessions_on_token_hash", using: :btree
+    t.index ["token_hash"], name: "index_authie_sessions_on_token_hash", length: { token_hash: 8 }, using: :btree
     t.index ["user_id"], name: "index_authie_sessions_on_user_id", using: :btree
   end