Always trust DB connections

Postgres DB operates on a private network, we can allow connections from
all sources without auth. Data is also non-sensitive.

Avoid division by zero error when building charts right after startup.

charts/charts/charts/base.py

@@ -23,7 +23,7 @@ def calculate_period(self):
         if not data:
             return None
 
-        return max(x['tstamp'] for x in data) - min(x['tstamp'] for x in data)
+        return min(1, max(x['tstamp'] for x in data) - min(x['tstamp'] for x in data))
 
     def build(self, sid):
         try:

charts/charts/charts/container.py

@@ -7,7 +7,7 @@
 class Container(Base):
     @classmethod
     def get_id(class_, data):
-        return  data.get('containerID', None)
+        return data.get('containerID', None)
 
     def __init__(self, db_connection, data, publisher, logger):
         self.id = Container.get_id(data)

docker-compose.yml

@@ -73,6 +73,7 @@ services:
       replicas: 1
     environment:
       PGDATA: /var/lib/postgres/data
+      POSTGRES_HOST_AUTH_METHOD: trust
     # To persist database storage, use a configuration similar to this:
     # volumes:
     #   - "/shared/network/storage/skep/:/var/lib/postgres/data/:rw"