Initial model

app/models/prometheus_query.rb

+class PrometheusQuery < ActiveRecord::Base
+  belongs_to :project
+end

db/migrate/20171213160629_create_prometheus_queries.rb

+class CreatePrometheusQueries < ActiveRecord::Migration
+  def change
+    create_table :prometheus_queries do |t|
+      t.references :project, index: true, foreign_key: true
+      t.string :title
+      t.string :query
+      t.string :y_label
+      t.string :unit
+      t.string :legend
+
+      t.timestamps null: false
+    end
+  end
+end

spec/models/prometheus_query_spec.rb

+require 'rails_helper'
+
+RSpec.describe PrometheusQuery, type: :model do
+  pending "add some examples to (or delete) #{__FILE__}"
+end