graph TB
    subgraph "Event Management"
        EVENT[Events]
        CATEGORY[Categories]
        INSTRUCTOR[Instructors]
    end

    subgraph "Booking"
        BOOKING[Bookings]
        AVAILABILITY[Availability]
        WAITLIST[Waitlist]
    end

    subgraph "Calendar"
        CALENDAR[Calendar View]
        SLOTS[Time Slots]
        RECURRENCE[Recurring Events]
    end

    subgraph "Customer"
        CONTACT[Contacts]
        HISTORY[Booking History]
        CREDITS[Event Credits]
    end

    EVENT --> CATEGORY
    EVENT --> INSTRUCTOR
    EVENT --> SLOTS

    BOOKING --> EVENT
    BOOKING --> CONTACT
    AVAILABILITY --> SLOTS

    CALENDAR --> EVENT
    RECURRENCE --> EVENT

    CONTACT --> HISTORY
    CONTACT --> CREDITS
    CREDITS --> BOOKING

    style EVENT fill:#e1f5fe
    style BOOKING fill:#fff3e0

erDiagram
    TENANT ||--o{ EVENT : has
    TENANT ||--o{ EVENT_CATEGORY : has
    TENANT ||--o{ INSTRUCTOR : has

    EVENT }o--|| EVENT_CATEGORY : belongs_to
    EVENT }o--o| INSTRUCTOR : led_by
    EVENT ||--o{ EVENT_BOOKING : has
    EVENT ||--o{ EVENT_OCCURRENCE : scheduled_as

    EVENT_BOOKING }o--|| CONTACT : made_by
    EVENT_BOOKING }o--|| EVENT_OCCURRENCE : for
    EVENT_BOOKING ||--o| PAYMENT_TRANSACTION : paid_by

    CALENDAR ||--o{ EVENT : displays
    AVAILABILITY ||--o{ TIME_SLOT : defines

    EVENT {
        string id PK
        string tenantId FK
        string categoryId FK
        string instructorId FK
        string title
        text description
        int capacity
        int duration
        decimal price
        enum status
        json recurrenceRule
        boolean requiresApproval
    }

    EVENT_BOOKING {
        string id PK
        string eventId FK
        string occurrenceId FK
        string contactId FK
        enum status
        int participants
        timestamp bookedAt
        string notes
        boolean checkedIn
        timestamp checkedInAt
    }

    EVENT_OCCURRENCE {
        string id PK
        string eventId FK
        timestamp startTime
        timestamp endTime
        int availableSpots
        enum status
    }

stateDiagram-v2
    [*] --> PENDING: Create Booking

    PENDING --> CONFIRMED: Auto-Confirm
    PENDING --> AWAITING_APPROVAL: Requires Approval
    PENDING --> CANCELLED: User Cancels

    AWAITING_APPROVAL --> CONFIRMED: Approved
    AWAITING_APPROVAL --> REJECTED: Rejected

    CONFIRMED --> CHECKED_IN: Check In
    CONFIRMED --> NO_SHOW: No Show
    CONFIRMED --> CANCELLED: Cancel

    CHECKED_IN --> COMPLETED: Event Ends
    NO_SHOW --> COMPLETED: Event Ends

    COMPLETED --> [*]
    CANCELLED --> [*]
    REJECTED --> [*]

    note right of PENDING
        Awaiting payment
        or confirmation
    end note

flowchart TD
    BROWSE[Browse Events] --> SELECT[Select Event]
    SELECT --> CHECK{Spots Available?}

    CHECK -->|Yes| BOOK[Create Booking]
    CHECK -->|No| WAITLIST[Join Waitlist]

    BOOK --> APPROVAL{Requires Approval?}
    APPROVAL -->|Yes| WAIT[Await Approval]
    APPROVAL -->|No| PAYMENT{Paid Event?}

    WAIT --> APPROVED{Approved?}
    APPROVED -->|Yes| PAYMENT
    APPROVED -->|No| REJECT[Booking Rejected]

    PAYMENT -->|Yes| PAY[Process Payment]
    PAYMENT -->|No| CONFIRM[Confirm Booking]

    PAY --> SUCCESS{Payment OK?}
    SUCCESS -->|Yes| CONFIRM
    SUCCESS -->|No| FAIL[Payment Failed]

    CONFIRM --> NOTIFY[Send Confirmation]
    NOTIFY --> CALENDAR[Add to Calendar]

    WAITLIST --> SPOT_OPEN[Spot Opens]
    SPOT_OPEN --> NOTIFY_WL[Notify Waitlist]
    NOTIFY_WL --> BOOK

    style CONFIRM fill:#e8f5e9
    style REJECT fill:#ffebee