Revert "Index and form for bit preferences"

db/migrate/20160917180923_add_index_to_users_bit_prefs.rb

@@ -1,24 +0,0 @@
-class AddIndexToUsersBitPrefs < ActiveRecord::Migration
-  def up
-    execute "set statement_timeout = 0"
-    execute <<-'SQL'
-      CREATE OR REPLACE FUNCTION bit_position_array(x bigint)
-      RETURNS integer[] AS $BODY$
-      select array_agg(i) 
-        from generate_series(0, floor(log(2, x))::integer) i
-       where (x & (1::bigint << i)) > 0;
-      $BODY$ LANGUAGE sql IMMUTABLE
-    SQL
-    
-    execute <<-'SQL'
-      CREATE INDEX index_users_on_bit_prefs_array
-       ON users USING gin (bit_position_array(bit_prefs) _int4_ops)
-    SQL
-  end
-
-  def down
-    execute "set statement_timeout = 0"
-    execute "DROP INDEX index_users_on_bit_prefs_array"
-    execute "DROP FUNCTION bit_position_array(x bigint)"
-  end
-end