classDiagram
    direction TB

    class Base {
        +ID: string
        +CreatedAt: time.Time
        +UpdatedAt: time.Time
        +DeletedAt: gorm.DeletedAt
        +BeforeCreate(db: *gorm.DB) error
    }

    class User {
        -Base
        +Username: string
        +PasswordHash: string
        +Role: string
        +Tier: string
        +Email: string
        +AvatarURL: string
        +Nickname: string
        +IsActive: bool
        +ForcePasswordReset: bool
        +LastLoginAt: *time.Time
    }

    class UserPermission {
        +ID: string
        +UserID: string
        +CanViewDashboard: bool
        +CanPlayMedia: bool
        +CanCast: bool
        +CanExternalPlayer: bool
        +CanFavorite: bool
        +CanViewHistory: bool
        +CanEditMedia: bool
        +CanRescrape: bool
        +CanUseAI: bool
        +CanCaptureFrames: bool
        +CanManageDownloads: bool
        +CanViewDiscover: bool
        +CanManageSubscriptions: bool
        +CanManageSites: bool
        +CanUseAIAssistant: bool
        +CanManageUsers: bool
        +CanManageFiles: bool
        +CanManageStrm: bool
        +CanAccessSettings: bool
    }

    class RefreshToken {
        +ID: string
        +UserID: string
        +TokenHash: string
        +ExpiresAt: time.Time
        +CreatedAt: time.Time
        +Revoked: bool
    }

    class Library {
        -Base
        +Name: string
        +Path: string
        +Type: string
        +Enabled: bool
        +ScanIntervalMin: int
        +MetadataLanguage: string
        +AdultContent: bool
        +PreferNFO: bool
        +EnableWatch: bool
        +MinFileSizeMB: int
    }

    class Media {
        -Base
        +LibraryID: string
        +SeriesID: string
        +Title: string
        +OriginalName: string
        +Path: string
        +SizeBytes: int64
        +DurationSec: int
        +Width: int
        +Height: int
        +VideoCodec: string
        +AudioCodec: string
        +Container: string
        +PosterURL: string
        +BackdropURL: string
        +Overview: string
        +Rating: float32
        +Year: int
        +SeasonNum: int
        +EpisodeNum: int
        +ScrapeStatus: string
        +TMDbID: int
        +BangumiID: int
        +DoubanID: int
        +NSFW: bool
        +FileHash: string
        +IsDuplicate: bool
        +DuplicateOfID: string
        +STRMURL: string
        +Resolution: string
        +AudioChannels: int
        +HdrFormat: string
        +FrameRate: float32
        +ColorSpace: string
        +BitDepth: int
        +Genres: string
    }

    class Series {
        -Base
        +LibraryID: string
        +Title: string
        +PosterURL: string
        +BackdropURL: string
        +Overview: string
        +Rating: float32
        +Year: int
        +TMDbID: int
        +BangumiID: int
    }

    class SubtitleTrack {
        -Base
        +MediaID: string
        +Language: string
        +LanguageName: string
        +Path: string
        +Source: string
        +Codec: string
        +IsInternal: bool
        +StreamIdx: int
    }

    class PlaybackHistory {
        -Base
        +UserID: string
        +MediaID: string
        +PositionMs: int64
        +DurationMs: int64
        +WatchedAt: time.Time
        +PlayedAt: time.Time
        +Completed: bool
        +DeviceType: string
        +IPAddress: string
    }

    class Favorite {
        -Base
        +UserID: string
        +MediaID: string
    }

    class Playlist {
        -Base
        +UserID: string
        +Name: string
        +Description: string
        +IsPublic: bool
        +CoverURL: string
    }

    class PlaylistItem {
        -Base
        +PlaylistID: string
        +MediaID: string
        +Position: int
    }

    class DownloadClient {
        -Base
        +Name: string
        +Type: string
        +Host: string
        +Port: int
        +Username: string
        +Password: string
        +Enabled: bool
        +Category: string
    }

    class DownloadTask {
        -Base
        +ClientID: string
        +UserID: string
        +Source: string
        +URL: string
        +SavePath: string
        +InfoHash: string
        +Status: string
        +Progress: float32
        +TotalSize: int64
        +SpeedDown: int64
        +SpeedUp: int64
        +Message: string
    }

    class Site {
        -Base
        +Name: string
        +BaseURL: string
        +SiteType: string
        +AuthType: string
        +Cookie: string
        +APIKey: string
        +AuthHeader: string
        +UserAgent: string
        +RSSURL: string
        +TimeoutSec: int
        +Priority: int
        +UseProxy: bool
        +RateLimit: int
        +Enabled: bool
        +LoginStatus: string
        +UploadBytes: int64
        +DownloadBytes: int64
    }

    class Subscription {
        -Base
        +UserID: string
        +Name: string
        +FeedURL: string
        +Filter: string
        +Enabled: bool
        +LastRunAt: *time.Time
        +TMDbID: int
        +MediaType: string
        +Year: int
        +QualityFilter: []byte
        +MinSizeMB: int
        +MaxSizeMB: int
        +ExcludeKeys: string
        +IncludeKeys: string
        +TotalDownloaded: int
        +Status: string
    }

    class NotifyChannel {
        -Base
        +Name: string
        +ChannelType: string
        +Enabled: bool
        +Config: string
        +EncryptedConfig: string
        +Events: string
    }

    class ApiConfig {
        +ID: string
        +Provider: string
        +APIKey: string
        +BaseURL: string
        +Extra: string
        +Enabled: bool
        +Description: string
        +LastTestedAt: *time.Time
        +TestResult: string
        +UpdatedAt: time.Time
    }

    class STRMRecord {
        -Base
        +MediaID: string
        +URL: string
        +Protocol: string
    }

    class Setting {
        +Key: string
        +Value: string
        +UpdatedAt: time.Time
    }

    class AccessLog {
        -Base
        +UserID: string
        +Action: string
        +Target: string
        +IP: string
        +Detail: string
    }

    User "1" -- "1..1" --> UserPermission : has
    User "1" -- "*" --> RefreshToken : issues
    Library "1" -- "1..*" --> Media : contains
    Media "*..*" -- "..1" --> Series : belongs_to
    Media "1" -- "1..*" --> SubtitleTrack : has_tracks
    User "1" -- "0..*" --> PlaybackHistory : records
    User "1" -- "0..*" --> Favorite : marks
    User "1" -- "0..*" --> Playlist : owns
    Playlist "1" -- "1..*" --> PlaylistItem : contains
    DownloadClient "1" -- "0..*" --> DownloadTask : manages
    Site "1" -- "0..*" --> Subscription : feeds_into
    Subscription "1" -- "0..*" --> DownloadTask : queues
    Media "1" -- "0..1" --> STRMRecord : has_strm