mermaid: update

banque.md

@@ -89,8 +89,8 @@ erDiagram
 
   %% Relations
 
-    person ||--o{ holder : "is held by"
-    company ||--o{ holder : "is held by"
+  person  ||--|| holder
+  company ||--|| holder
 ```
 
 ## 2. Les comptes
@@ -122,6 +122,66 @@ begin;
 commit;
 ```
 
+```mermaid
+erDiagram
+  person {
+    bigint id PK
+    text firstname
+    text lastname
+    date birthdate
+  }
+
+  company {
+    bigint id PK
+    text registration_numer
+    date creation_date
+  }
+
+  bank {
+    bigint id PK
+  }
+
+  holder {
+    bigint id PK
+    date creation_date
+  }
+
+  account {
+    bigint id PK
+    date creation_date
+    decimal balance >0
+    text currency_code FK
+  }
+
+  account_holder {
+    bigint account_id FK
+    bigint holder_id FK
+  }
+
+  transaction {
+    bigint id PK
+    date transaction_date
+    decimal amount
+  }
+
+  currency {
+    text code PK
+  }
+
+  currency {
+    text code PK
+  }
+
+  %% Relations
+
+  person  ||--|| holder
+  company ||--|| holder
+  bank    ||--|| holder
+  holder  }|--|{ account_holder
+  account_holder }|--|{ account
+
+```
+
 ## 4. Procédure stockée
 
 Pour fiabiliser le process et être sûr que l'execution s'effectue toujours dans une transaction,

banque.sql

@@ -98,7 +98,6 @@ create table account (
   id bigint primary key generated always as identity,
   number text unique not null,
   opened_at date not null default current_date,
-  closed_at date,
   balance numeric(18,6) not null default 0 check (balance >= 0)
 );