Added DB size sensor

customize.yaml

@@ -1,2 +1,4 @@
 media_player.wohnzimmer_main:
   icon: mdi:audio-video
+sensor.home_assistant_datenbankgrosse:
+  icon: mdi:database

sensors.yaml

@@ -10,3 +10,11 @@
   - platform: dwd_weather_warnings
     name: "DWD Unwetterwarnungen"
     region_name: "Münster-Süd"
+# Database size sensor
+  - platform: sql
+    db_url: !secret ha_recorder_dburl
+    queries:
+      - name: "Home Assistant Datenbankgröße"
+        query: 'SELECT table_schema "database", Round(Sum(data_length + index_length) / 1048576, 2) "value" FROM information_schema.tables WHERE table_schema="homeassistant" GROUP BY table_schema;'
+        column: 'value'
+        unit_of_measurement: MB