diff --git a/backend/pb_migrations/1754400000_init_schema.js b/backend/pb_migrations/1754400000_init_schema.js
index b353646..9e2b5ab 100644
--- a/backend/pb_migrations/1754400000_init_schema.js
+++ b/backend/pb_migrations/1754400000_init_schema.js
@@ -130,7 +130,7 @@ migrate((app) => {
                 "hidden": false,
                 "id": "file376926767",
                 "maxSelect": 1,
-                "maxSize": 0,
+                "maxSize": 5242880,
                 "mimeTypes": [
                     "image/jpeg",
                     "image/png",
@@ -173,7 +173,7 @@ migrate((app) => {
             "CREATE UNIQUE INDEX `__pb_users_auth__tokenKey_idx` ON `users` (`tokenKey`)"
         ],
         "created": "2023-10-28 21:35:49.020Z",
-        "updated": "2026-08-06 12:06:09.028Z",
+        "updated": "2026-08-06 15:05:38.398Z",
         "system": false,
         "authRule": "",
         "manageRule": null,
@@ -1273,7 +1273,7 @@ migrate((app) => {
         "viewRule": "team.users.id ?= @request.auth.id",
         "createRule": "team.owner.id ?= @request.auth.id || team.admins.id ?= @request.auth.id",
         "updateRule": "team.owner.id ?= @request.auth.id || team.admins.id ?= @request.auth.id",
-        "deleteRule": "team.owner.id ?= @request.auth.id || team.admins.id ?= @request.auth.id",
+        "deleteRule": "team.owner.id ?= @request.auth.id || team.admins.id ?= @request.auth.id && @collection.trail_markers.flag ?!= id",
         "name": "trail_flags",
         "type": "base",
         "fields": [
@@ -1390,7 +1390,7 @@ migrate((app) => {
         ],
         "indexes": [],
         "created": "2026-08-06 14:55:19.508Z",
-        "updated": "2026-08-06 14:55:19.508Z",
+        "updated": "2026-08-06 15:05:38.402Z",
         "system": false
     },
     {
diff --git a/backend/pb_migrations/1754500000_created_trails.js b/backend/pb_migrations/1754500000_created_trails.js
index 9fca1c3..085f800 100644
--- a/backend/pb_migrations/1754500000_created_trails.js
+++ b/backend/pb_migrations/1754500000_created_trails.js
@@ -149,7 +149,9 @@ migrate((app) => {
         viewRule: 'team.users.id ?= @request.auth.id',
         createRule: adminOnly,
         updateRule: adminOnly,
-        deleteRule: adminOnly,
+        // Löschen nur, solange kein Marker diesen Typ verwendet — sonst
+        // bliebe ein Pflichtfeld zurück, das ins Leere zeigt.
+        deleteRule: adminOnly + ' && @collection.trail_markers.flag ?!= id',
         fields: [
             teamScoped('team'),
             { name: 'label', type: 'text', required: true, max: 60 },
diff --git a/backend/pb_migrations/1754500200_trail_flags_delete_rule.js b/backend/pb_migrations/1754500200_trail_flags_delete_rule.js
new file mode 100644
index 0000000..bee4927
--- /dev/null
+++ b/backend/pb_migrations/1754500200_trail_flags_delete_rule.js
@@ -0,0 +1,23 @@
+/// <reference path="../pb_data/types.d.ts" />
+
+// trail_flags.deleteRule ergänzt: Löschen nur, solange kein Marker diesen
+// Typ verwendet — sonst bliebe ein Pflichtfeld (trail_markers.flag) zurück,
+// das ins Leere zeigt. Separate Migration, weil 1754500000_created_trails.js
+// bereits angewendet wurde und PocketBase Migrationsdateien nur einmal
+// anhand des Dateinamens ausführt, unabhängig vom Inhalt.
+
+migrate((app) => {
+    const flags = app.findCollectionByNameOrId('trail_flags')
+    const adminOnly =
+        'team.owner.id ?= @request.auth.id' +
+        ' || team.admins.id ?= @request.auth.id'
+    flags.deleteRule = adminOnly + ' && @collection.trail_markers.flag ?!= id'
+    app.save(flags)
+}, (app) => {
+    const flags = app.findCollectionByNameOrId('trail_flags')
+    const adminOnly =
+        'team.owner.id ?= @request.auth.id' +
+        ' || team.admins.id ?= @request.auth.id'
+    flags.deleteRule = adminOnly
+    app.save(flags)
+})