Remove OfficerAssignment composed index

app/models/poll/officer_assignment.rb

@@ -8,7 +8,7 @@ class Poll
 
     validates :officer_id, presence: true
     validates :booth_assignment_id, presence: true
-    validates :date, presence: true, uniqueness: { scope: [:officer_id, :booth_assignment_id] }
+    validates :date, presence: true
 
     delegate :poll_id, :booth_id, to: :booth_assignment
 

db/migrate/20171003095936_remove_officer_assigment_composed_index.rb

@@ -0,0 +1,5 @@
+class RemoveOfficerAssigmentComposedIndex < ActiveRecord::Migration
+  def change
+    remove_index "poll_officer_assignments", name: "index_poll_officer_assignments_on_officer_id_and_date"
+  end
+end

db/schema.rb

@@ -11,7 +11,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 20171002191347) do
+ActiveRecord::Schema.define(version: 20171003095936) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -639,7 +639,6 @@ ActiveRecord::Schema.define(version: 20171002191347) do
   end
 
   add_index "poll_officer_assignments", ["booth_assignment_id"], name: "index_poll_officer_assignments_on_booth_assignment_id", using: :btree
-  add_index "poll_officer_assignments", ["officer_id", "date"], name: "index_poll_officer_assignments_on_officer_id_and_date", using: :btree
   add_index "poll_officer_assignments", ["officer_id"], name: "index_poll_officer_assignments_on_officer_id", using: :btree
 
   create_table "poll_officers", force: :cascade do |t|