diff --git a/finance/grafana/dashboards/finanzen.json b/finance/grafana/dashboards/finanzen.json
index 6b2aa3a..2f0ea2a 100644
--- a/finance/grafana/dashboards/finanzen.json
+++ b/finance/grafana/dashboards/finanzen.json
@@ -103,12 +103,14 @@
         "defaults": {
           "unit": "currencyEUR"
         },
-        "overrides": []
+        "overrides": [{ "matcher": { "id": "byType", "options": "time" }, "properties": [{ "id": "unit", "value": "time:MM.YYYY" }] }]
       },
       "options": {
         "legend": { "displayMode": "list", "placement": "bottom" },
         "stacking": "normal",
-        "xTickLabelRotation": 0
+        "xTickLabelRotation": 0,
+        "showValue": "never",
+        "tooltip": { "mode": "multi", "sort": "asc" }
       },
       "targets": [
         {
@@ -175,11 +177,13 @@
       "title": "Planung nach Kategorie",
       "datasource": { "type": "postgres", "uid": "FinanzDB" },
       "gridPos": { "h": 8, "w": 12, "x": 0, "y": 16 },
-      "fieldConfig": { "defaults": { "unit": "currencyEUR" }, "overrides": [] },
+      "fieldConfig": { "defaults": { "unit": "currencyEUR" }, "overrides": [{ "matcher": { "id": "byType", "options": "time" }, "properties": [{ "id": "unit", "value": "time:MM.YYYY" }] }] },
       "options": {
         "legend": { "displayMode": "list", "placement": "bottom" },
         "stacking": "normal",
-        "xTickLabelRotation": 0
+        "xTickLabelRotation": 0,
+        "showValue": "never",
+        "tooltip": { "mode": "multi", "sort": "asc" }
       },
       "targets": [
         {
diff --git a/finance/tests/test_grafana_dashboard.py b/finance/tests/test_grafana_dashboard.py
index 2890427..c6df242 100644
--- a/finance/tests/test_grafana_dashboard.py
+++ b/finance/tests/test_grafana_dashboard.py
@@ -69,3 +69,22 @@ def test_panels_ueberlappen_nicht_und_ids_eindeutig():
             for y in range(g["y"], g["y"] + g["h"]):
                 assert (x, y) not in cells, p["title"]
                 cells.add((x, y))
+
+
+BARCHARTS = ("Monat nach Kategorie", "Planung nach Kategorie")
+
+
+def test_barcharts_ohne_segment_beschriftung_mit_voller_aufschluesselung():
+    """Gestapelte Balken mit vielen Kategorien: Segment-Beschriftungen
+    überlagern sich (sichtbar bleibt ein zufälliger kleiner Wert). Daher keine
+    Werte im Balken, stattdessen alle Kategorien im Tooltip, größte Ausgabe
+    zuerst, und den Monat ohne Uhrzeit (Monatserster UTC wirkte in MEZ wie
+    01:00 Uhr)."""
+    panels = {p["title"]: p for p in _load()["panels"]}
+    for title in BARCHARTS:
+        p = panels[title]
+        assert p["options"]["showValue"] == "never", title
+        assert p["options"]["tooltip"] == {"mode": "multi", "sort": "asc"}, title
+        overrides = p["fieldConfig"]["overrides"]
+        assert {"matcher": {"id": "byType", "options": "time"},
+                "properties": [{"id": "unit", "value": "time:MM.YYYY"}]} in overrides, title