Chart (Mermaid)

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  sequenceDiagram
    participant web as Web Browser
    participant blog as Blog Service
    participant account as Account Service
    participant mail as Mail Service
    participant db as Storage

    Note over web,db: The user must be logged in to submit blog posts
    web->>+account: Logs in using credentials
    account->>db: Query stored accounts
    db->>account: Respond with query result

    alt Credentials not found
        account->>web: Invalid credentials
    else Credentials found
        account->>-web: Successfully logged in

        Note over web,db: When the user is authenticated, they can now submit new posts
        web->>+blog: Submit new post
        blog->>db: Store post data

        par Notifications
            blog--)mail: Send mail to blog subscribers
            blog--)db: Store in-site notifications
        and Response
            blog-->>-web: Successfully posted
        end
    end

  graph LR
    A[Square Rect] -- Link text --> B((Circle))
    A --> C(Round Rect)
    B --> D{Rhombus}
    C --> D

  %%{init: { 'logLevel': 'debug', 'theme': 'base', 'gitGraph': {'rotateCommitLabel': false}} }%%
gitGraph
  commit id: "feat(api): ..."
  commit id: "a"
  commit id: "b"
  commit id: "fix(client): .extra long label.."
  branch c2
  commit id: "feat(modules): ..."
  commit id: "test(client): ..."
  checkout main
  commit id: "fix(api): ..."
  commit id: "ci: ..."
  branch b1
  commit
  branch b2
  commit

  quadrantChart
    title Reach and engagement of campaigns
    x-axis Low Reach --> High Reach
    y-axis Low Engagement --> High Engagement
    quadrant-1 We should expand
    quadrant-2 Need to promote
    quadrant-3 Re-evaluate
    quadrant-4 May be improved
    Campaign A: [0.3, 0.6]
    Campaign B: [0.45, 0.23]
    Campaign C: [0.57, 0.69]
    Campaign D: [0.78, 0.34]
    Campaign E: [0.40, 0.34]
    Campaign F: [0.35, 0.78]