diff --git a/pb_migrations/1788500000_client_logs_flavor.js b/pb_migrations/1788500000_client_logs_flavor.js
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+++ b/pb_migrations/1788500000_client_logs_flavor.js
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+/// <reference path="../pb_data/types.d.ts" />
+
+// Add `flavor` to client_logs: which build variant a device runs, clean or adult.
+//
+// WHY THIS MIGRATION EXISTS: the app was already sending the field and PocketBase
+// was silently throwing it away. An unknown key in a create payload is simply
+// dropped — no error, no warning, HTTP 200 — which is the same silent-drop
+// behaviour already documented for hidden fields in amber-app/CLAUDE.md. So the
+// status dashboard's "Podle varianty" row read `neznámá` for every record while the
+// client believed it was reporting the variant, and the only way to notice was to
+// query the stored rows and find the field missing.
+//
+// Not folded into `meta`, though that would have needed no migration and the
+// dashboard already falls back to reading it there: the variant is a first-class
+// dimension of every record, exactly like `platform` and `appVersion` beside it,
+// and burying it in a json blob would make the one query it exists for — group the
+// errors by variant — awkward for no benefit.
+//
+// Additive and nullable, so existing rows stay valid and simply have no variant.
+// Fourteen days from now the retention cron will have aged all of them out and the
+// column will be populated for everything.
+
+migrate(
+  (app) => {
+    const logs = app.findCollectionByNameOrId("client_logs")
+    logs.fields.add(
+      new TextField({
+        name: "flavor",
+        // "clean" | "adult". Not required: every row written before the app build
+        // that sends it, and any future client that omits it, must still be
+        // accepted — losing a diagnostic record over a missing dimension would be
+        // a worse trade than not knowing the variant.
+        required: false,
+        max: 20,
+      }),
+    )
+    app.save(logs)
+  },
+  (app) => {
+    const logs = app.findCollectionByNameOrId("client_logs")
+    logs.fields.removeByName("flavor")
+    app.save(logs)
+  },
+)