Add utf8mb4 migration and tests for emoji support

Co-authored-by: moio <250541+moio@users.noreply.github.com>
Signed-off-by: Silvio Moioli <silvio@moioli.net>

Author: Copilot

config/database.yml.example

@@ -6,7 +6,8 @@
 
 default: &default
   adapter: mysql2
-  encoding: utf8
+  encoding: utf8mb4
+  collation: utf8mb4_unicode_ci
   username: root
   password: root
   host: <%= host %>

db/migrate/20251202131317_convert_to_utf8mb4.rb

@@ -0,0 +1,27 @@
+class ConvertToUtf8mb4 < ActiveRecord::Migration[7.2]
+  # Tables that need utf8mb4 for emoji support in their text fields
+  TABLES_TO_CONVERT = %w[
+    announcements
+    comments
+    faqs
+    projects
+    updates
+  ].freeze
+
+  def up
+    # Convert the database default charset
+    execute "ALTER DATABASE `#{connection.current_database}` CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
+
+    TABLES_TO_CONVERT.each do |table|
+      execute "ALTER TABLE #{table} CONVERT TO CHARACTER SET utf8mb4 COLLATE utf8mb4_unicode_ci;"
+    end
+  end
+
+  def down
+    TABLES_TO_CONVERT.each do |table|
+      execute "ALTER TABLE #{table} CONVERT TO CHARACTER SET utf8 COLLATE utf8_bin;"
+    end
+
+    execute "ALTER DATABASE `#{connection.current_database}` CHARACTER SET utf8 COLLATE utf8_general_ci;"
+  end
+end

spec/models/comment_spec.rb

@@ -6,4 +6,13 @@
     comment.destroy!
     expect(Comment.count).to eq 0
   end
+
+  describe 'emoji support' do
+    it 'saves and retrieves comments with emoji characters' do
+      emoji_text = 'This is a great idea! 😱🎉👍'
+      comment = create(:comment, text: emoji_text)
+      comment.reload
+      expect(comment.text).to eq(emoji_text)
+    end
+  end
 end

spec/models/project_spec.rb

@@ -175,4 +175,20 @@
       expect(Notification.where(recipient: user).count).to eq(1)
     end
   end
+
+  describe 'emoji support' do
+    it 'saves and retrieves project descriptions with emoji characters' do
+      emoji_description = 'Project with emojis 😱🎉👍 and more text'
+      project = create(:project, description: emoji_description)
+      project.reload
+      expect(project.description).to eq(emoji_description)
+    end
+
+    it 'saves and retrieves project titles with emoji characters' do
+      emoji_title = 'My Awesome Project 🚀'
+      project = create(:project, title: emoji_title)
+      project.reload
+      expect(project.title).to eq(emoji_title)
+    end
+  end
 end