Change db vars to standard postgres equivalents

config/base.ini

@@ -11,8 +11,8 @@ CAC_URL = https://localhost:8001
 REQUESTS_QUEUE_BASE_URL = http://localhost:8003
 REDIS_URI = redis://localhost:6379
 SESSION_TTL_SECONDS = 600
-DATABASE_HOST = localhost
-DATABASE_PORT = 5432
-DATABASE_USERNAME = postgres
-DATABASE_PASSWORD = postgres
-DATABASE_NAME = atat
+PGHOST = localhost
+PGPORT = 5432
+PGUSER = postgres
+PGPASSWORD = postgres
+PGDATABASE = atat