initial data model implementation

app/models/entry.rb

@@ -0,0 +1,19 @@
+class Entry < ApplicationRecord
+  belongs_to :created_by, class_name: "User", optional: true
+  belongs_to :updated_by, class_name: "User", optional: true
+
+  has_many :suggested_meanings, dependent: :destroy
+  has_many :comments, as: :commentable, dependent: :destroy
+  has_many :entry_versions, dependent: :destroy
+
+  enum category: {
+    word: 0,
+    phrase: 1,
+    name: 2,
+    title: 3,
+    reference: 4,
+    other: 5
+  }
+
+  validates :category, presence: true
+end