fix: Grafana-Datasource-UID gepinnt, Dashboard-Feinheiten

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

finance/grafana/dashboards/finanzen.json

@@ -97,9 +97,6 @@
       "gridPos": { "h": 8, "w": 12, "x": 0, "y": 8 },
       "fieldConfig": {
         "defaults": {
-          "custom": {
-            "stacking": { "mode": "normal", "group": "A" }
-          },
           "unit": "currencyEUR"
         },
         "overrides": []
@@ -143,8 +140,9 @@
           "thresholds": {
             "mode": "absolute",
             "steps": [
-              { "color": "red", "value": 0 },
-              { "color": "orange", "value": 500 }
+              { "color": "red", "value": null },
+              { "color": "orange", "value": 0 },
+              { "color": "green", "value": 500 }
             ]
           }
         },

finance/grafana/provisioning/datasources/postgres.yaml

@@ -2,6 +2,7 @@ apiVersion: 1
 datasources:
   - name: FinanzDB
     type: postgres
+    uid: FinanzDB
     access: proxy
     url: localhost:5432
     user: finance_read