Initial commit

db/migrate/20201222155655_add_indexes_on_trades.rb

@@ -0,0 +1,8 @@
+class AddIndexesOnTrades < ActiveRecord::Migration[5.2]
+  def change
+    remove_index :trades, column: %i[maker_id taker_id]
+
+    add_index :trades, :maker_id
+    add_index :trades, :taker_id
+  end
+end