commit 3788fd

2026-09-02 14:20:50 Bob Green: -/-

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`programming/filesystem layer.md` ..
@@ 1,7 1,15 @@
	# Filesystem Layer

	```mermaid
-
+	erDiagram
+	CUSTOMER }\|..\|{ DELIVERY-ADDRESS : has
+	CUSTOMER \|\|--o{ ORDER : places
+	CUSTOMER \|\|--o{ INVOICE : "liable for"
+	DELIVERY-ADDRESS \|\|--o{ ORDER : receives
+	INVOICE \|\|--\|{ ORDER : covers
+	ORDER \|\|--\|{ ORDER-ITEM : includes
+	PRODUCT-CATEGORY \|\|--\|{ PRODUCT : contains
+	PRODUCT \|\|--o{ ORDER-ITEM : "ordered in"
	```
	> [!NOTE]
	> This diagram is evolving as I am in the process of implementing