Fix working group slug updates being silently ignored

.changeset/ripe-zebras-sell.md

@@ -0,0 +1,2 @@
+---
+---

server/src/db/working-group-db.ts

@@ -153,6 +153,7 @@ export class WorkingGroupDatabase {
 
     const COLUMN_MAP: Record<string, string> = {
       name: 'name',
+      slug: 'slug',
       description: 'description',
       slack_channel_url: 'slack_channel_url',
       slack_channel_id: 'slack_channel_id',

server/src/routes/committees.ts

@@ -313,6 +313,25 @@ export function createCommitteeRouters(): {
         updates.region = null;
       }
 
+      // Validate slug format and uniqueness if changing
+      if (updates.slug) {
+        const slugPattern = /^[a-z0-9-]+$/;
+        if (!slugPattern.test(updates.slug)) {
+          return res.status(400).json({
+            error: 'Invalid slug',
+            message: 'Slug must contain only lowercase letters, numbers, and hyphens'
+          });
+        }
+
+        const slugAvailable = await workingGroupDb.isSlugAvailable(updates.slug, id);
+        if (!slugAvailable) {
+          return res.status(409).json({
+            error: 'Slug already exists',
+            message: `A working group with slug '${updates.slug}' already exists`
+          });
+        }
+      }
+
       // Check if we're adding/changing a Slack channel
       const existingGroup = await workingGroupDb.getWorkingGroupById(id);
       const isAddingChannel = updates.slack_channel_url && (!existingGroup?.slack_channel_id || updates.slack_channel_url !== existingGroup.slack_channel_url);