1 files changed, 64 insertions, 0 deletions
diff --git a/internal/domain/types.go b/internal/domain/types.go
new file mode 100644
index 0000000..e2586ea
--- /dev/null
+++ b/internal/domain/types.go
@@ -0,0 +1,64 @@
+package domain
+
+import "time"
+
+type Protocol string
+
+const (
+	ProtocolOpenAI    Protocol = "openai"
+	ProtocolAnthropic Protocol = "anthropic"
+)
+
+type Principal struct {
+	KeyID     string
+	TenantID  string
+	ProjectID string
+	Scopes    []string
+}
+
+type Provider struct {
+	ID       string
+	Protocol Protocol
+	BaseURL  string
+	APIKey   string
+}
+
+type Route struct {
+	Provider      Provider
+	UpstreamModel string
+	Priority      int
+	Weight        int
+}
+
+type Model struct {
+	ID      string
+	OwnedBy string
+	Routes  []Route
+}
+
+type Usage struct {
+	InputTokens              int64 `json:"input_tokens,omitempty"`
+	OutputTokens             int64 `json:"output_tokens,omitempty"`
+	TotalTokens              int64 `json:"total_tokens,omitempty"`
+	CacheCreationInputTokens int64 `json:"cache_creation_input_tokens,omitempty"`
+	CacheReadInputTokens     int64 `json:"cache_read_input_tokens,omitempty"`
+}
+
+type UsageEvent struct {
+	RequestID     string    `json:"request_id"`
+	KeyID         string    `json:"key_id"`
+	TenantID      string    `json:"tenant_id"`
+	ProjectID     string    `json:"project_id"`
+	PublicModel   string    `json:"public_model"`
+	ProviderID    string    `json:"provider_id,omitempty"`
+	UpstreamModel string    `json:"upstream_model,omitempty"`
+	Protocol      Protocol  `json:"protocol"`
+	Stream        bool      `json:"stream"`
+	StatusCode    int       `json:"status_code"`
+	Success       bool      `json:"success"`
+	ErrorType     string    `json:"error_type,omitempty"`
+	Attempts      int       `json:"attempts"`
+	StartedAt     time.Time `json:"started_at"`
+	DurationMS    int64     `json:"duration_ms"`
+	Usage         Usage     `json:"usage"`
+}