handle chip and chip values operations

db/migrate/20200827113649_create_chips.rb

@@ -0,0 +1,12 @@
+class CreateChips < ActiveRecord::Migration[5.2]
+  def change
+    create_table :chips do |t|
+      t.text :name, null: false
+      t.text :symbol, null: false
+      t.boolean :enabled, default: true
+      t.timestamps
+    end
+
+    add_index :chips, :name, unique: true
+  end
+end

db/migrate/20200827142428_create_chip_values.rb

@@ -0,0 +1,12 @@
+class CreateChipValues < ActiveRecord::Migration[5.2]
+  def change
+    create_table :chip_values do |t|
+      t.references :base_chip, foreign_key: { to_table: :chips }
+      t.references :secondary_chip, foreign_key: { to_table: :chips }
+      t.decimal :value, precision: 12, scale: 3, null: false
+      t.timestamps
+
+      t.index [:base_chip_id, :secondary_chip_id], unique: true
+    end
+  end
+end