diff --git a/db/migration/1725540224795-CleanUpChartConfigStackMode.ts b/db/migration/1725540224795-CleanUpChartConfigStackMode.ts
new file mode 100644
index 00000000000..0686bb9a529
--- /dev/null
+++ b/db/migration/1725540224795-CleanUpChartConfigStackMode.ts
@@ -0,0 +1,21 @@
+import { MigrationInterface, QueryRunner } from "typeorm"
+
+export class CleanUpChartConfigStackMode1725540224795
+    implements MigrationInterface
+{
+    public async up(queryRunner: QueryRunner): Promise<void> {
+        await queryRunner.query(`-- sql
+          UPDATE chart_configs cc
+          JOIN charts c ON c.configId = cc.id
+          SET
+              -- remove NULLs from the patch config
+              cc.patch = JSON_REMOVE(cc.patch, '$.stackMode'),
+              -- replace NULLs with the default value in the full config
+              cc.full = JSON_REPLACE(cc.full, '$.stackMode', 'absolute')
+          WHERE cc.patch ->> '$.stackMode' = 'null'
+      `)
+    }
+
+    // eslint-disable-next-line
+    public async down(queryRunner: QueryRunner): Promise<void> {}
+}
diff --git a/devTools/schemaProcessor/columns.json b/devTools/schemaProcessor/columns.json
index ef55467b8bb..4fde4cd7362 100644
--- a/devTools/schemaProcessor/columns.json
+++ b/devTools/schemaProcessor/columns.json
@@ -653,10 +653,10 @@
         "editor": "checkbox"
     },
     {
-        "type": ["string", "null"],
+        "type": "string",
         "pointer": "/stackMode",
         "editor": "textfield",
-        "enumOptions": ["absolute", "relative", "grouped", "stacked", null]
+        "enumOptions": ["absolute", "relative"]
     },
     {
         "type": ["string", "number"],