Fix path to sqlite db.

app.py

@@ -20,7 +20,7 @@ logging.basicConfig(level=logging.DEBUG)
 logger = logging.getLogger(__name__)
 
 app = Flask(__name__)
-app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///data/timetrack.db'
+app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:////data/timetrack.db'
 app.config['SQLALCHEMY_TRACK_MODIFICATIONS'] = False
 app.config['SECRET_KEY'] = os.environ.get('SECRET_KEY', 'dev_key_for_timetrack')
 app.config['PERMANENT_SESSION_LIFETIME'] = timedelta(days=7)  # Session lasts for 7 days