[Issue #5] - Reworked app to better organize results with their corresponding tests

db/migrations/0003_add_tests_table.rb

@@ -0,0 +1,31 @@
+Sequel.migration do
+
+  up do
+    # create tests table
+    create_table(:tests) do
+      primary_key :id
+      String :date_tag, null: false
+      DateTime :created_at, default: Sequel::CURRENT_TIMESTAMP
+      DateTime :updated_at, default: Sequel::CURRENT_TIMESTAMP
+    end
+
+    # add foreign keys to tests table
+    alter_table(:tests) do
+      add_foreign_key(:benchmark_id, :benchmarks, null: false)
+      add_foreign_key(:hardware_id, :hardware, null: false)
+    end
+
+    # add the test ID link to results table; remove old links to hardware and benchmarks tables
+    alter_table(:results) do
+      add_foreign_key(:test_id, :tests, null: false)
+      drop_column(:benchmark_id)
+      drop_column(:hardware_id)
+    end
+  end
+
+  down do
+    drop_column(:results, :test_id)
+    drop_table(:tests)
+  end
+
+end