sequenceDiagram
    participant Client as Model Client
    participant Model as Model Instance
    participant Events as Event System
    participant Cache as Cache Layer
    participant DB as Database
    participant Queue as Queue System
    participant Relations as Relationship Loader
    participant Observer as Model Observer

    %% Model Creation
    Client->>Model: Create Model
    activate Model
    Model->>Events: Dispatch Creating Event
    activate Events
    Events->>Observer: Handle Creating
    Observer-->>Events: Continue
    Events-->>Model: Proceed
    deactivate Events

    %% Database Operation
    Model->>DB: Insert Record
    activate DB
    DB-->>Model: Record Created
    deactivate DB

    %% Post Creation
    Model->>Events: Dispatch Created Event
    activate Events
    Events->>Observer: Handle Created
    Observer-->>Events: Continue
    Events->>Queue: Queue Events
    Queue-->>Events: Queued
    Events-->>Model: Complete
    deactivate Events
    Model-->>Client: Model Instance
    deactivate Model

    %% Model Retrieval
    Client->>Model: Find Model
    activate Model
    Model->>Cache: Check Cache
    activate Cache
    
    alt Cache Hit
        Cache-->>Model: Return Cached
    else Cache Miss
        Cache-->>Model: Not Found
        Model->>DB: Query Database
        activate DB
        DB-->>Model: Record Found
        deactivate DB
        Model->>Cache: Store in Cache
        Cache-->>Model: Cached
    end
    deactivate Cache

    %% Relationship Loading
    Model->>Relations: Load Relations
    activate Relations
    Relations->>DB: Query Relations
    activate DB
    DB-->>Relations: Related Records
    deactivate DB
    Relations-->>Model: Relations Loaded
    deactivate Relations
    Model-->>Client: Complete Model
    deactivate Model

    %% Model Update
    Client->>Model: Update Model
    activate Model
    Model->>Events: Dispatch Updating Event
    activate Events
    Events->>Observer: Handle Updating
    Observer-->>Events: Continue
    Events-->>Model: Proceed
    deactivate Events

    Model->>DB: Update Record
    activate DB
    DB-->>Model: Record Updated
    deactivate DB

    Model->>Cache: Invalidate Cache
    activate Cache
    Cache-->>Model: Cache Cleared
    deactivate Cache

    Model->>Events: Dispatch Updated Event
    activate Events
    Events->>Observer: Handle Updated
    Observer-->>Events: Continue
    Events->>Queue: Queue Events
    Queue-->>Events: Queued
    Events-->>Model: Complete
    deactivate Events
    Model-->>Client: Updated Model
    deactivate Model

    %% Model Deletion
    Client->>Model: Delete Model
    activate Model
    Model->>Events: Dispatch Deleting Event
    activate Events
    Events->>Observer: Handle Deleting
    Observer-->>Events: Continue
    Events-->>Model: Proceed
    deactivate Events

    Model->>DB: Delete Record
    activate DB
    DB-->>Model: Record Deleted
    deactivate DB

    Model->>Cache: Clear Cache
    activate Cache
    Cache-->>Model: Cache Cleared
    deactivate Cache

    Model->>Events: Dispatch Deleted Event
    activate Events
    Events->>Observer: Handle Deleted
    Observer-->>Events: Continue
    Events->>Queue: Queue Events
    Queue-->>Events: Queued
    Events-->>Model: Complete
    deactivate Events
    Model-->>Client: Deletion Confirmed
    deactivate Model

    %% Style Definitions
    style Client fill:#f9f,stroke:#333,stroke-width:2px
    style Model fill:#bbf,stroke:#333,stroke-width:2px
    style Events fill:#bfb,stroke:#333,stroke-width:2px
    style Cache fill:#fbb,stroke:#333,stroke-width:2px
    style DB fill:#fbb,stroke:#333,stroke-width:2px
    style Queue fill:#bfb,stroke:#333,stroke-width:2px
    style Relations fill:#bbf,stroke:#333,stroke-width:2px
    style Observer fill:#bfb,stroke:#333,stroke-width:2px

    %% Notes
    Note over Model: Model Lifecycle
    Note over Events: Event Handling
    Note over Cache: Cache Management
    Note over DB: Data Persistence
    Note over Queue: Async Processing
    Note over Relations: Relationship Management
    Note over Observer: Lifecycle Hooks

    %% Model States
    Note over Model: States:<br>1. Creating/Created<br>2. Retrieving/Retrieved<br>3. Updating/Updated<br>4. Deleting/Deleted

    %% Event Types
    Note over Events: Events:<br>1. Model Events<br>2. Relation Events<br>3. Cache Events<br>4. Queue Events

    %% Cache Strategy
    Note over Cache: Strategy:<br>1. Read Through<br>2. Write Behind<br>3. Cache Invalidation

    %% Observer Points
    Note over Observer: Hooks:<br>1. Before Events<br>2. After Events<br>3. Around Events