setup defaults for environment variables (configured for a locally running Postgres docker with default config)

database.py

@@ -1,10 +1,12 @@
 import os
 import psycopg2
 
-DB_ADDRESS = os.environ['DB_ADDRESS']
-DB_USER = os.environ['DB_USER']
-DB_PASSWORD = os.environ['DB_PASSWORD']
-DB_NAME = os.environ['DB_NAME']
+
+DB_ADDRESS = os.getenv('DB_ADDRESS', 'localhost')
+DB_PORT = os.getenv('DB_PORT', 5432)
+DB_USER = os.getenv('DB_USER', 'postgres')
+DB_PASSWORD = os.getenv('DB_PASSWORD', '')
+DB_NAME = os.getenv('DB_NAME', 'postgres')
 
 
 class DBConnector:
@@ -31,7 +33,6 @@ class DBConnector:
             result = []
         return result
 
-
     def read(self, **kwargs):
         """Read rows from a database that match the specified filters.