新增：活跃度计算访问量限制

db/migrate/20220923012923_create_timeable_visit_records.rb

@@ -0,0 +1,13 @@
+class CreateTimeableVisitRecords < ActiveRecord::Migration[5.2]
+  def change
+    create_table :timeable_visit_records do |t|
+      t.string :time
+      t.references :project
+      t.integer :visits, default: 0
+
+      t.timestamps
+    end
+
+    add_index :timeable_visit_records, :time
+  end
+end