fix(db-postgres): ensure index names are not too long (#13428)

Fixes https://github.com/payloadcms/payload/issues/13196

test/database/getConfig.ts

@@ -44,6 +44,39 @@ export const getConfig: () => Partial<Config> = () => ({
           type: 'text',
           name: 'title',
         },
+        {
+          type: 'tabs',
+          tabs: [
+            {
+              name: 'hideout',
+              fields: [
+                {
+                  label: 'Cameras',
+                  type: 'tabs',
+                  unique: true,
+                  tabs: [
+                    {
+                      name: 'camera1',
+                      fields: [
+                        {
+                          type: 'row',
+                          fields: [
+                            {
+                              name: 'time1Image',
+                              type: 'relationship',
+                              relationTo: 'posts',
+                              unique: true,
+                            },
+                          ],
+                        },
+                      ],
+                    },
+                  ],
+                },
+              ],
+            },
+          ],
+        },
       ],
     },
     {