Start migration to postgresql and other minor fixes and improvements

docker-compose.yml

@@ -0,0 +1,29 @@
+version: '3.8'
+
+services:
+  db:
+    image: postgres:latest
+    container_name: banking_system_db
+    restart: unless-stopped
+    environment:
+      POSTGRES_DB: banking_system
+      POSTGRES_USER: dbadmin
+      POSTGRES_PASSWORD: your_db_password
+    volumes:
+      - db_data:/var/lib/postgresql/data
+    ports:
+      - "5432:5432"
+
+  api:
+    build: .
+    container_name: banking_system_api
+    restart: unless-stopped
+    environment:
+      DATABASE_URL: postgres://dbadmin:your_db_password@db/banking_system
+    depends_on:
+      - db
+    ports:
+      - "8000:80"
+
+volumes:
+  db_data: