text: """Models for timing data."""
  
  from datetime import datetime
  from typing import Dict, Optional
  
  from pydantic import BaseModel, Field
  
  
  class StopwatchData(BaseModel):
      """Timing for a single event."""
  
      event: str = Field(..., title="Name of the event", example="lab_create")
  
      annotations: Dict[str, str] = Field(
          default_factory=dict,
          title="Event annotations",
          example={"notebook": "example.ipynb"},
      )
  
      start: datetime = Field(
          ..., title="Start of event", example="2021-07-21T19:43:40.446072+00:00"
      )
  
      stop: Optional[datetime] = Field(
          None,
          title="End of event",
          description="Will be null if the event is ongoing",
          example="2021-07-21T19:43:40.514623+00:00",
      )
  
      elapsed: float = Field(
          None,
          title="Duration of event in seconds",
          description="Will be null if the event is ongoing",
          example=0.068551,
      )
  
      failed: bool = Field(
          False, title="Whether the event failed", example=False
      )
  