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:memo: add database diagram
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README.md
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README.md
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export SECRET_KEY="wibble"
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export DATABASE_URL="postgresql://user:password@localhost:5432/database"
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```
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## Database
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```mermaid
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erDiagram
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USER_ACCOUNT {
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uuid id PK
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user_role_enum user_role
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text full_name
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text password_hash
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text phone
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text email
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boolean is_active
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timestamp created_at
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timestamp updated_at
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}
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ACCESS_AREA {
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uuid id PK
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text label
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}
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ACCESS_CARD {
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uuid id PK
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text label
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timestamp created_at
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timestamp updated_at
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}
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ACCESS_CARD_OWNERSHIP {
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uuid id PK
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uuid card_id FK
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uuid user_id FK
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}
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CARD_USAGE {
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uuid id PK
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uuid card_id FK
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uuid user_id FK
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uuid access_area_id FK
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timestamp usage_timestamp
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}
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ITEM {
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uuid id PK
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text label
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}
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USER_ACCOUNT ||--o{ ACCESS_CARD_OWNERSHIP : "owns"
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ACCESS_CARD ||--o{ ACCESS_CARD_OWNERSHIP : "assigned to"
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USER_ACCOUNT ||--o{ CARD_USAGE : "triggers"
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ACCESS_CARD ||--o{ CARD_USAGE : "used for"
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ACCESS_AREA ||--o{ CARD_USAGE : "location of"
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```