going somewhere.

src/db/README.md

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+# DB schema
+
+```mermaid
+erDiagram
+    users ||--o{ accounts : owner
+    users ||--o{ securities : owner
+    security_types ||--o{ securities: s
+    securities ||--o{ accounts: ps
+    users ||--o{ cheques: ps
+    securities ||--o{ cheques: ps
+```