Basic architecture diagram for a potential deadlink checker

src/deadlinks/architecture.mermaid

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+flowchart LR
+    subgraph DeadLinks
+        URLs["`[]URL{
+        - URLString
+        - LastChecked
+        - Status
+        - DestURLs
+        - Pinned
+        }`"]
+        style URLs text-align:left
+
+        Cleaner -->|"periodically delete where\nnot linked to and not pinned"| URLs
+
+        CheckerWorker -->|getNext| Queue
+        Queue -->|iterate over stale| URLs
+        CheckerWorker -->|upsert| URLs
+    end
+
+    User -->|upsert pinned| URLs
+    User -->|notify pinned| Queue
+    User -->|query by state| URLs