Add intro auto-delete feature for departed members

[Copilot]

Admins need the ability to automatically handle introductions from members who leave the server, with manual confirmation before deletion.

Changes

Commands

• /intro-channel - Sets the introductions channel
• /admin-messages-channel - Sets the admin notification channel
• /intro-auto-delete - Toggles feature enable/disable

Event Handler

• guildMemberRemove - On member departure, searches intro channel for their messages (limit 100), sends confirmation request to admin channel with Delete/Keep buttons

Button Interactions

• Delete: Removes intro message, updates confirmation with success/error
• Keep: Dismisses confirmation, no action

Database

• IntroChannelSetting model stores introChannelId, adminMessagesChannelId, autoDeleteEnabled per guild
• Added MongoDB CRUD functions for intro settings

Integration

• Registered commands in activeCommands.ts
• Added GuildMessages and MessageContent intents for message fetching
• Button handler uses Promise.allSettled for concurrent admin notifications

// Admin confirmation includes message preview and actions
await adminChannel.send({
  content: `**Member Left:** ${username}\n**Message:** \`\`\`${preview}\`\`\`\n[Jump to Message](${url})`,
  components: [row], // Delete/Keep buttons
})

Note: Fetches last 100 messages only. Messages beyond that limit won't be detected.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• fastdl.mongodb.org
  • Triggering command: /usr/local/bin/node ./postinstall.js (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Remove introduction for user's who leave</issue_title>
<issue_description>As a server admin I want to have a command to enable/disable a function of the bot where when it detects that a server member leaves the server any message from the member who left that is in the specified introductions channel is removed.

• There should be a /intro-auto-delete command that can be set to either enable or disable.
• There should be a /intro-channel commannd which specifies the server's introductions channel.
• There should be a /admin-messages-channel command which specifies the private channel where to send message to the admin.
• When a member of the server leaves it should trigger the bot to check for any messages left by that user in the channel set by /admin-messages-channel asking if the admin wants to delete the specified message with an action button to confirm.
• Clicking the confirm button on the admin messages channel message should delete the message in the intro channel.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Remove introduction for user's who leave #2

---

💬 We'd love your input! Share your thoughts on Copilot coding agent in our 2 minute survey.