delete leftovers & reserve id

- delete team memberships
- create a reserved id

app/config/collections.php

@@ -1187,6 +1187,13 @@ $collections = [
             ],
         ],
     ],
+    Database::SYSTEM_COLLECTION_RESERVED => [
+        '$collection' => Database::SYSTEM_COLLECTION_COLLECTIONS,
+        '$id' => Database::SYSTEM_COLLECTION_RESERVED,
+        '$permissions' => ['read' => ['*']],
+        'name' => 'Reserved',
+        'structure' => true,
+    ],
 ];
 
 /*

app/controllers/api/users.php

@@ -208,6 +208,19 @@ $utopia->delete('/v1/users/:userId')
             if (!$projectDB->deleteDocument($userId)) {
                 throw new Exception('Failed to remove file from DB', 500);
             }
+
+            $reservedId = $projectDB->createDocument([
+                '$collection' => Database::SYSTEM_COLLECTION_RESERVED,
+                '$id' => $userId,
+                '$permissions' => [
+                    'read' => ['*'],
+                ],
+            ]);
+
+            if (false === $reservedId) {
+                throw new Exception('Failed saving reserved id to DB', 500);
+            }
+
             $tokens = $user->getAttribute('tokens', []);
 
             foreach ($tokens as $token) {
@@ -216,6 +229,21 @@ $utopia->delete('/v1/users/:userId')
                 }
             }
 
+            $memberships = $projectDB->getCollection([
+                'limit' => 2000,
+                'offset' => 0,
+                'filters' => [
+                    '$collection='.Database::SYSTEM_COLLECTION_MEMBERSHIPS,
+                    'userId='.$userId,
+                ],
+            ]);
+
+            foreach ($memberships as $membership) {
+                if (!$projectDB->deleteDocument($membership->getId())) {
+                    throw new Exception('Failed to remove team membership from DB', 500);
+                }
+            }
+
             $response->noContent();
         }
     );

src/Appwrite/Database/Database.php

@@ -23,6 +23,7 @@ class Database
     const SYSTEM_COLLECTION_USAGES = 'usages'; //TODO add structure
     const SYSTEM_COLLECTION_DOMAINS = 'domains';
     const SYSTEM_COLLECTION_CERTIFICATES = 'certificates';
+    const SYSTEM_COLLECTION_RESERVED = 'reserved';
 
     // Auth, Account and Users (private to user)
     const SYSTEM_COLLECTION_USERS = 'users';