Add profile directory (#9427)

Fix #5578

db/migrate/20181203003808_create_accounts_tags_join_table.rb

@@ -0,0 +1,8 @@
+class CreateAccountsTagsJoinTable < ActiveRecord::Migration[5.2]
+  def change
+    create_join_table :accounts, :tags do |t|
+      t.index [:account_id, :tag_id]
+      t.index [:tag_id, :account_id], unique: true
+    end
+  end
+end

db/migrate/20181203021853_add_discoverable_to_accounts.rb

@@ -0,0 +1,5 @@
+class AddDiscoverableToAccounts < ActiveRecord::Migration[5.2]
+  def change
+    add_column :accounts, :discoverable, :boolean
+  end
+end

db/migrate/20181204193439_add_last_status_at_to_account_stats.rb

@@ -0,0 +1,5 @@
+class AddLastStatusAtToAccountStats < ActiveRecord::Migration[5.2]
+  def change
+    add_column :account_stats, :last_status_at, :datetime
+  end
+end

db/migrate/20181204215309_create_account_tag_stats.rb

@@ -0,0 +1,11 @@
+class CreateAccountTagStats < ActiveRecord::Migration[5.2]
+  def change
+    create_table :account_tag_stats do |t|
+      t.belongs_to :tag, null: false, foreign_key: { on_delete: :cascade }, index: { unique: true }
+      t.bigint :accounts_count, default: 0, null: false
+      t.boolean :hidden, default: false, null: false
+
+      t.timestamps
+    end
+  end
+end