Added ChatGPT-created Mermaid database diagram to the Readme file

misc/Readme.md

@@ -48,3 +48,156 @@ DROP TABLE IF EXISTS `shipcall`;
 SET FOREIGN_KEY_CHECKS = 1;
 ```
 
+## Schema
+
+```mermaid
+erDiagram
+    participant {
+        INT id PK
+        VARCHAR name
+        VARCHAR street
+        VARCHAR postal_code
+        VARCHAR city
+        INT type
+        INT flags
+    }
+    port {
+        INT id PK
+        VARCHAR name
+        CHAR locode
+    }
+    berth {
+        INT id PK
+        VARCHAR name
+        BIT lock
+        INT owner_id FK
+        INT authority_id FK
+        INT port_id FK
+        BIT deleted
+    }
+    ship {
+        INT id PK
+        VARCHAR name
+        INT imo
+        VARCHAR callsign
+        INT participant_id FK
+        FLOAT length
+        FLOAT width
+        BIT is_tug
+        INT bollard_pull
+        INT eni
+        BIT deleted
+    }
+    shipcall {
+        INT id PK
+        INT ship_id FK
+        TINYINT type
+        DATETIME eta
+        DATETIME etd
+        INT arrival_berth_id FK
+        INT departure_berth_id FK
+        INT port_id FK
+        INT flags
+        BIT tug_required
+        BIT pilot_required
+    }
+    times {
+        INT id PK
+        INT shipcall_id FK
+        INT participant_id FK
+        INT berth_id FK
+        INT participant_type
+        DATETIME eta_berth
+        DATETIME etd_berth
+        DATETIME lock_time
+        DATETIME zone_entry
+    }
+    notification {
+        INT id PK
+        INT shipcall_id FK
+        INT participant_id FK
+        TINYINT level
+        TINYINT type
+    }
+    history {
+        INT id PK
+        INT participant_id FK
+        INT user_id FK
+        INT shipcall_id FK
+        DATETIME timestamp
+        DATETIME eta
+        INT type
+        INT operation
+    }
+    shipcall_participant_map {
+        INT id PK
+        INT shipcall_id FK
+        INT participant_id FK
+        INT type
+    }
+    shipcall_tug_map {
+        INT id PK
+        INT shipcall_id FK
+        INT ship_id FK
+    }
+    participant_port_map {
+        INT id PK
+        INT participant_id FK
+        INT port_id FK
+    }
+    user {
+        INT id PK
+        INT participant_id FK
+        VARCHAR first_name
+        VARCHAR last_name
+        VARCHAR user_name
+        VARCHAR user_email
+    }
+    role {
+        INT id PK
+        VARCHAR name
+        VARCHAR description
+    }
+    securable {
+        INT id PK
+        VARCHAR name
+    }
+    role_securable_map {
+        INT id PK
+        INT role_id FK
+        INT securable_id FK
+    }
+    user_role_map {
+        INT id PK
+        INT user_id FK
+        INT role_id FK
+    }
+
+    participant ||--o{ berth : owner_id
+    participant ||--o{ berth : authority_id
+    port ||--o{ berth : port_id
+    participant ||--o{ ship : participant_id
+    ship ||--o{ shipcall : ship_id
+    berth ||--o{ shipcall : arrival_berth_id
+    berth ||--o{ shipcall : departure_berth_id
+    port ||--o{ shipcall : port_id
+    shipcall ||--|| times : shipcall_id
+    participant ||--|| times : participant_id
+    berth ||--o{ times : berth_id
+    shipcall ||--o{ notification : shipcall_id
+    participant ||--o{ notification : participant_id
+    participant ||--o{ history : participant_id
+    user ||--o{ history : user_id
+    shipcall ||--o{ history : shipcall_id
+    shipcall ||--o{ shipcall_participant_map : shipcall_id
+    participant ||--o{ shipcall_participant_map : participant_id
+    shipcall ||--o{ shipcall_tug_map : shipcall_id
+    ship ||--o{ shipcall_tug_map : ship_id
+    participant ||--o{ participant_port_map : participant_id
+    port ||--o{ participant_port_map : port_id
+    participant ||--o{ user : participant_id
+    user ||--o{ user_role_map : user_id
+    role ||--o{ user_role_map : role_id
+    role ||--o{ role_securable_map : role_id
+    securable ||--o{ role_securable_map : securable_id
+```