Refactor db connection

db/connect.rb

+def connect
+  Sequel.connect(
+    adapter: :postgres,
+    database: ENV['DB_DATABASE'],
+    user: ENV['DB_USERNAME'],
+    password: ENV['DB_PASSWORD'],
+  )
+end

db/migrate.rb

 require 'sequel'
 
-def migrate
-  db = Sequel.connect(adapter: :postgres, database: 'vlv2')
+require_relative 'connect'
 
+def migrate
+  db = connect
   db.create_table :threads do
     primary_key :id
     String :title

db/scrape.rb

 require 'nokogiri'
 require 'sequel'
 
+require_relative '../db/connect'
 require_relative '../lib/auth'
 
 def fetch_page(page_number, cookie)
 
 def scrape(first: 0, last: 0)
   cookie = login(ENV['VLV_USERNAME'], ENV['VLV_PASSWORD'])
-  db = Sequel.connect(adapter: :postgres, database: ENV['DB_DATABASE'])
+  db = connect
 
   (first..last).each do |page_number|
     page = fetch_page(page_number, cookie)

lib/search.rb

 require 'sequel'
 
 def search(params)
-  db = Sequel.connect(adapter: :postgres, database: ENV['DB_DATABASE'])
+  db = connect
   query = params[:q].strip
   offset = (params[:page] - 1) * 10
   username = params[:username].strip