Forgot that this is needed for DB stats..

config/custom_components/sensor/database.py

@@ -0,0 +1,69 @@
+"""
+Sensor for checking the size of your HA database file. 
+
+For more details about this platform, please refer to the documentation at
+https://home-assistant.io/components/sensor.database
+"""
+import logging
+import os
+
+from homeassistant.helpers.entity import Entity
+
+_LOGGER = logging.getLogger(__name__)
+
+PATH = "/config/home-assistant_v2.db"
+
+
+def setup_platform(hass, config, add_devices, discovery_info=None):
+    """Set up the database sensor."""
+    db = Database(PATH)
+    add_devices([db], True)
+
+
+class Database(Entity):
+    """Representation of the HA database."""
+    ICON = 'mdi:harddisk'
+
+    def __init__(self, path):
+        """Initialize the data object."""
+        self._path = path   # Need to check its a valid path
+        self._size = None
+        self._name = "Database_sensor"
+        self._attributes = {}
+        self._unit_of_measurement = 'MB'
+        self.update()
+
+    def update(self):
+        """Get the size of the database."""
+        self._size = self.get_db_size(self._path)
+
+    def get_db_size(self, path):
+        statinfo = os.stat(path)
+        decimals = 2
+        db_size = round(statinfo.st_size/1e6, decimals)
+        return db_size
+
+    @property
+    def name(self):
+        """Return the name of the sensor."""
+        return self._name
+
+    @property
+    def state(self):
+        """Return the state of the sensor."""
+        return self._size
+
+    @property
+    def icon(self):
+        """Icon to use in the frontend, if any."""
+        return self.ICON
+
+    @property
+    def device_state_attributes(self):
+        """Attributes."""
+        return self._attributes
+
+    @property
+    def unit_of_measurement(self):
+        """Return the unit of measurement of this entity, if any."""
+        return self._unit_of_measurement