diff --git a/Gemfile b/Gemfile
index f2479d5..efb60a0 100644
--- a/Gemfile
+++ b/Gemfile
@@ -6,6 +6,10 @@ gem "sequel"
 gem "sqlite3"
 
 group :dev do
+  # Manually adding IRB as a dependency so I can adjust colors until
+  # https://github.com/ruby/reline/pull/552 is in Ruby itself
+  gem "irb"
+
   gem "minitest"
   gem "rake"
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 6a5c349..121e87a 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,16 +2,28 @@ GEM
   remote: https://rubygems.org/
   specs:
     bigdecimal (3.1.4)
+    io-console (0.6.0)
+    irb (1.9.0)
+      rdoc
+      reline (>= 0.3.8)
     minitest (5.20.0)
+    psych (5.1.1.1)
+      stringio
     rake (13.0.6)
+    rdoc (6.6.0)
+      psych (>= 4.0.0)
+    reline (0.4.0)
+      io-console (~> 0.5)
     sequel (5.73.0)
       bigdecimal
     sqlite3 (1.6.8-arm64-darwin)
+    stringio (3.0.9)
 
 PLATFORMS
   arm64-darwin-22
 
 DEPENDENCIES
+  irb
   minitest
   rake
   sequel
diff --git a/db/migrations/007_add_id_to_models.rb b/db/migrations/007_add_id_to_models.rb
new file mode 100644
index 0000000..15be742
--- /dev/null
+++ b/db/migrations/007_add_id_to_models.rb
@@ -0,0 +1,15 @@
+Sequel.migration do
+  change do
+    alter_table(:notes) do
+      add_primary_key :id
+    end
+
+    alter_table(:sources) do
+      add_primary_key :id
+    end
+
+    alter_table(:titles) do
+      add_primary_key :id
+    end
+  end
+end
diff --git a/lib/alphadex.rb b/lib/alphadex.rb
index 408a7de..a8df2a1 100644
--- a/lib/alphadex.rb
+++ b/lib/alphadex.rb
@@ -1,13 +1,13 @@
 require_relative "../models"
 
 module Alphadex
-  def self.add_bookmark(url, title, note, tags)
+  def self.add_bookmark(url:, title:, note:, tags:)
     fail "url already exists" unless Url.where(url:).empty?
 
     DB.transaction do
       entity = Entity.create
       entity.url = Url.new(url:)
-      entity.title = Title.new(title:)
+      entity.title = Title.new(title:) if title
       entity.add_note(text: note)
       tags.map { Tag.find_or_create(name: _1) }.each do |tag|
         entity.add_tag(tag)
diff --git a/models.rb b/models.rb
index 2f1c217..33b76ed 100644
--- a/models.rb
+++ b/models.rb
@@ -4,35 +4,38 @@ require_relative "db"
 
 Sequel::Model.plugin :timestamps
 
-class Entity < Sequel::Model
-  one_to_many :notes
-  one_to_many :sources
-  one_to_one :title
-  many_to_many :tags
-  one_to_one :url
-
-  def add_tag(tag)
-    DB[:entities_tags].insert(entity_id: self.id, tag_id: tag.id, created_at: DateTime.now)
+module Alphadex
+  class Entity < Sequel::Model
+    one_to_many :notes
+    one_to_many :sources
+    one_to_one :title
+    many_to_many :tags
+    one_to_one :url
+
+    # override this since I have `created_at` on this join table for some reason
+    def add_tag(tag)
+      DB[:entities_tags].insert(entity_id: self.id, tag_id: tag.id, created_at: DateTime.now)
+    end
   end
-end
 
-class Note < Sequel::Model
-  many_to_one :entity
-end
+  class Note < Sequel::Model
+    many_to_one :entity
+  end
 
-class Source < Sequel::Model
-  many_to_one :entity
-  many_to_one :source, class: :Entity
-end
+  class Source < Sequel::Model
+    many_to_one :entity
+    many_to_one :source, class: :Entity
+  end
 
-class Title < Sequel::Model
-  many_to_one :entity
-end
+  class Title < Sequel::Model
+    many_to_one :entity
+  end
 
-class Tag < Sequel::Model
-  many_to_many :entities
-end
+  class Tag < Sequel::Model
+    many_to_many :entities
+  end
 
-class Url < Sequel::Model
-  one_to_one :entity
+  class Url < Sequel::Model
+    many_to_one :entity
+  end
 end