Init

appdaemon/settings/apps/test/db.py

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+import appdaemon.plugins.hass.hassapi as hass
+from datetime import datetime, timedelta
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import sessionmaker, scoped_session
+
+class Db(hass.Hass):
+  def initialize(self):
+    # Set up callback and listen for state change of desired switch
+    self.listen_state(self.entity_changed, self.args["entity_id"])
+    self.update_stats()
+
+  def entity_changed(self, entity, attribute, old, new, kwargs):
+    self.update_stats()
+
+  def update_stats(self):
+    engine = create_engine(self.args["connectionstring"])
+    session_obj = sessionmaker(bind=engine)
+    session = scoped_session(session_obj)
+
+    results = session.execute('SELECT state,last_changed FROM states where entity_id = "' + self.args["entity_id"] + '" and state<>\'unknown\' and last_changed>=(NOW() - INTERVAL 1 MONTH) order by last_changed limit 1')
+    row = results.first()
+    start_value = float(row['state'])
+    start_date = row['last_changed']
+
+    current_value = float(self.get_state(self.args["entity_id"]))
+    diff = round(current_value - start_value,2)
+    self.log('Counter start value: {} (@{}), current value: {}, diff: {}'.format(start_value, start_date, current_value, diff))