Fixing migrations. Not sure what I was thinking before :/

db/migrate/11_fix_usda_weights.rb

@@ -0,0 +1,16 @@
+class FixUsdaWeights < ActiveRecord::Migration
+  def change
+    remove_column :usda_weights, :id
+
+    change_table :usda_weights do |t|
+      t.remove_index :nutrient_databank_number
+
+      t.index [
+        :nutrient_databank_number,
+        :sequence_number
+      ], {
+        unique: true
+      }
+    end
+  end
+end

db/migrate/12_fix_usda_foods_nutrients.rb

@@ -0,0 +1,20 @@
+class FixUsdaFoodsNutrients < ActiveRecord::Migration
+  def change
+    remove_column :usda_foods_nutrients, :id
+
+    change_table :usda_foods_nutrients do |t|
+      t.remove_index [
+        :nutrient_databank_number,
+        :nutrient_number
+      ]
+
+      t.index [
+        :nutrient_databank_number,
+        :nutrient_number
+      ], {
+        unique: true,
+        name: 'index_usda_foods_nutrients_on_unique_keys'
+      }
+    end
+  end
+end

db/migrate/13_fix_usda_source_codes.rb

@@ -0,0 +1,10 @@
+class FixUsdaSourceCodes < ActiveRecord::Migration
+  def change
+    remove_column :source_codes, :id
+
+    change_table :source_codes do |t|
+      t.remove_index :code
+      t.index :code, unique: true
+    end
+  end
+end