Feature: Create conversations from Tweets (#470)

* Feature: Add tweets to conversations

db/migrate/20200206180408_add_contact_to_message.rb

@@ -0,0 +1,12 @@
+class AddContactToMessage < ActiveRecord::Migration[6.0]
+  def change
+    add_reference(:messages, :contact, foreign_key: true, index: true)
+
+    ::Message.all.each do |message|
+      conversation = message.conversation
+      next if conversation.contact.nil?
+
+      message.update!(contact_id: conversation.contact.id)
+    end
+  end
+end

db/migrate/20200206180927_rename_fb_id_to_source_id.rb

@@ -0,0 +1,7 @@
+class RenameFbIdToSourceId < ActiveRecord::Migration[6.0]
+  def change
+    rename_column :messages, :fb_id, :source_id
+
+    add_index(:messages, :source_id)
+  end
+end

db/migrate/20200206182948_add_additional_attributes_to_contact.rb

@@ -0,0 +1,5 @@
+class AddAdditionalAttributesToContact < ActiveRecord::Migration[6.0]
+  def change
+    add_column :contacts, :additional_attributes, :jsonb
+  end
+end