Initial commit

db/migrate/20190814102636_create_trading_fees.rb

@@ -0,0 +1,16 @@
+class CreateTradingFees < ActiveRecord::Migration[5.2]
+  def change
+    create_table :trading_fees do |t|
+
+      t.string :market_id, limit: 20, default: 'any', null: false, index: true, foreign_key: true
+      t.string :group, limit: 32, default: 'any', null: false, index: true
+
+      t.decimal :maker, precision: 5, scale: 4, default: 0, null: false
+      t.decimal :taker, precision: 5, scale: 4, default: 0, null: false
+
+      t.timestamps
+    end
+
+    add_index :trading_fees, %i[market_id group], unique: true
+  end
+end