feat: add block statistic

app/models/block_statistic.rb

@@ -0,0 +1,16 @@
+class BlockStatistic < ApplicationRecord
+end
+
+# == Schema Information
+#
+# Table name: block_statistics
+#
+#  id              :bigint           not null, primary key
+#  difficulty      :string
+#  hash_rate       :string
+#  live_cell_count :string           default("0")
+#  dead_cell_count :string           default("0")
+#  block_number    :string
+#  created_at      :datetime         not null
+#  updated_at      :datetime         not null
+#

db/migrate/20191201023327_create_block_statistics.rb

@@ -0,0 +1,13 @@
+class CreateBlockStatistics < ActiveRecord::Migration[6.0]
+  def change
+    create_table :block_statistics do |t|
+      t.string :difficulty
+      t.string :hash_rate
+      t.string :live_cell_count, default: "0"
+      t.string :dead_cell_count, default: "0"
+      t.string :block_number
+
+      t.timestamps
+    end
+  end
+end

db/schema.rb

@@ -10,7 +10,7 @@
 #
 # It's strongly recommended that you check this file into your version control system.
 
-ActiveRecord::Schema.define(version: 2019_11_27_045149) do
+ActiveRecord::Schema.define(version: 2019_12_01_023327) do
 
   # These are extensions that must be enabled in order to support this database
   enable_extension "plpgsql"
@@ -40,6 +40,16 @@
     t.index ["lock_hash"], name: "index_addresses_on_lock_hash", unique: true
   end
 
+  create_table "block_statistics", force: :cascade do |t|
+    t.string "difficulty"
+    t.string "hash_rate"
+    t.string "live_cell_count", default: "0"
+    t.string "dead_cell_count", default: "0"
+    t.string "block_number"
+    t.datetime "created_at", precision: 6, null: false
+    t.datetime "updated_at", precision: 6, null: false
+  end
+
   create_table "blocks", force: :cascade do |t|
     t.binary "block_hash"
     t.decimal "number", precision: 30