feat: headless cms event handlers

[brunozoric]

Short Description

Headless CMS Event handlers for Groups, Models and Entries.

Relevant Links

• Headless CMS - About
• Headless CMS Group Event Handlers
• Headless CMS Model Event Handlers
• Headless CMS Entry Event Handlers
• Headless CMS Entry Event Handler Extended Example
• Headless CMS Group Use Cases
• Headless CMS Model Use Cases
• Headless CMS Entry Use Cases
• Basic - Result

Checklist

• I added page metadata (description, keywords)
• I've added "Can I Use This?" section (if needed, e.g. if documenting a new feature)
• I added What You'll Learn at the top of the page and every item in the list starts with a lower case letter
• I used title case for titles and subtitles (in the main menu and in the page content)
• I checked for typos and grammar mistakes
• I added alt / title attributes for inserted images (if any)
• When linking code from GitHub, I did it via a specific tag (and not next / v5 branch)

Screenshots (if relevant):

N/A

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Project	Deployment	Review	Updated (UTC)
docs-webiny-com	Ready	Preview, Comment	Jan 29, 2026 11:17am