feat: add single step retry

api/core/workflow/nodes/base/entities.py

@@ -113,6 +113,10 @@ class RetryConfig(BaseModel):
     retry_interval: int = 0  # retry interval in milliseconds
     retry_enabled: bool = False  # whether retry is enabled
 
+    @property
+    def retry_interval_seconds(self) -> float:
+        return self.retry_interval / 1000
+
 
 class BaseNodeData(ABC, BaseModel):
     title: str

api/core/workflow/nodes/event/event.py

@@ -4,6 +4,7 @@ from pydantic import BaseModel, Field
 
 from core.model_runtime.entities.llm_entities import LLMUsage
 from core.workflow.entities.node_entities import NodeRunResult
+from models.workflow import WorkflowNodeExecutionStatus
 
 
 class RunCompletedEvent(BaseModel):
@@ -36,3 +37,17 @@ class RunRetryEvent(BaseModel):
     error: str = Field(..., description="error")
     retry_index: int = Field(..., description="Retry attempt number")
     start_at: datetime = Field(..., description="Retry start time")
+
+
+class SingleStepRetryEvent(BaseModel):
+    """Single step retry event"""
+
+    status: str = WorkflowNodeExecutionStatus.RETRY.value
+
+    inputs: dict | None = Field(..., description="input")
+    error: str = Field(..., description="error")
+    outputs: dict = Field(..., description="output")
+    retry_index: int = Field(..., description="Retry attempt number")
+    error: str = Field(..., description="error")
+    elapsed_time: float = Field(..., description="elapsed time")
+    execution_metadata: dict | None = Field(..., description="execution metadata")