Use cylinder for db and general cleanup

documents/diagram.md

@@ -1,45 +1,38 @@
-# Forms Platform - C4 diagram
+# Forms Platform - architecture diagram
 
 ```mermaid
 flowchart TB
-    %% External Users
     subgraph "External Users"
         formFiller[Form Filler: Submits forms]
         formCreator[Form Creator: Uses no-code interface to create forms]
         formReviewer[Form Reviewer: Reviews submitted forms]
     end
 
-    %% Internal System
     subgraph "Forms Platform (Internal)"
         webServer[Node.js Web Server: Handles form creation, submission, and interactions]
-        database[Postgres Database: Stores form data and user information]
+        database[(Postgres DB: Stores form data and user information)]
     end
 
-    %% Dummy node for layout control
-    dummyNode[ ]:::invisible
-
-    %% External Systems (grouped together, positioned below the Forms Platform)
     subgraph "External Systems"
         loginGov[Login.gov: Handles authentication]
 
         subgraph "Agency Systems"
             agencyBackend[Agency Backend Systems: Receives submitted form data]
-            s3Bucket[S3 Bucket: Stores completed forms]
+            s3Bucket[Amazon S3: Stores completed forms]
         end
     end
 
-    %% Relationships between users and the internal system
     formCreator -->|Creates forms using| webServer
     formFiller -->|Submits forms via| webServer
     formReviewer -->|Reviews submitted forms using| webServer
     webServer -->|Stores and retrieves form data from| database
 
-    %% Relationships with external systems (actions + HTTPS on separate lines)
     webServer -->|Authenticates form creators - https| loginGov
     webServer -->|Submits form data to Agency Backend - https| agencyBackend
     webServer -->|Uploads form PDFs to S3 Bucket - https| s3Bucket
 
     %% Forcing "External Systems" to be below "Forms Platform"
+    dummyNode[ ]:::invisible
     webServer --> dummyNode
     dummyNode --> loginGov
 ```