class CreateNutrientMeasurements < ActiveRecord::Migration[8.0] def change create_table :nutrient_measurements do |t| t.date :measured_on t.float :nno3 t.float :p t.float :k t.float :ca t.float :mg t.float :s t.float :na t.float :cl t.float :si t.float :fe t.float :zn t.float :b t.float :mn t.float :cu t.float :mo t.float :nnh4 t.timestamps end add_index :nutrient_measurements, :measured_on, unique: true end end