add postgres and refactor code

dev/docker-compose.yaml

@@ -0,0 +1,10 @@
+version: "3.9"
+services:
+  astra_users_db:
+    image: postgres:14.8
+    environment:
+      POSTGRES_DB: "astra_users_db"
+      POSTGRES_USER: "astra_users"
+      POSTGRES_PASSWORD: "password"
+    ports:
+      - "5432:5432"