Change column type to binary from string

db/migrate/20180226050030_add_checksum_to_ci_job_artifacts.rb

@@ -2,7 +2,6 @@ class AddChecksumToCiJobArtifacts < ActiveRecord::Migration
   DOWNTIME = false
 
   def change
-    add_column :ci_job_artifacts, :checksum, :string, limit: 64
+    add_column :ci_job_artifacts, :checksum, :binary
   end
 end
-

db/schema.rb

@@ -346,7 +346,7 @@ ActiveRecord::Schema.define(version: 20180304204842) do
     t.datetime_with_timezone "updated_at", null: false
     t.datetime_with_timezone "expire_at"
     t.string "file"
-    t.string "checksum", limit: 64
+    t.binary "checksum"
   end
 
   add_index "ci_job_artifacts", ["expire_at", "job_id"], name: "index_ci_job_artifacts_on_expire_at_and_job_id", using: :btree