feat: Introduce WorkflowExecution Domain Entity and Repository, Replace WorkflowRun Direct Usage, and Unify Stream Response Logic (#20067)

Signed-off-by: -LAN- <laipz8200@outlook.com>

api/core/workflow/entities/workflow_execution_entities.py

@@ -0,0 +1,91 @@
+"""
+Domain entities for workflow execution.
+
+Models are independent of the storage mechanism and don't contain
+implementation details like tenant_id, app_id, etc.
+"""
+
+from collections.abc import Mapping
+from datetime import UTC, datetime
+from enum import StrEnum
+from typing import Any, Optional
+
+from pydantic import BaseModel, Field
+
+
+class WorkflowType(StrEnum):
+    """
+    Workflow Type Enum for domain layer
+    """
+
+    WORKFLOW = "workflow"
+    CHAT = "chat"
+
+
+class WorkflowExecutionStatus(StrEnum):
+    RUNNING = "running"
+    SUCCEEDED = "succeeded"
+    FAILED = "failed"
+    STOPPED = "stopped"
+    PARTIAL_SUCCEEDED = "partial-succeeded"
+
+
+class WorkflowExecution(BaseModel):
+    """
+    Domain model for workflow execution based on WorkflowRun but without
+    user, tenant, and app attributes.
+    """
+
+    id: str = Field(...)
+    workflow_id: str = Field(...)
+    workflow_version: str = Field(...)
+    sequence_number: int = Field(...)
+
+    type: WorkflowType = Field(...)
+    graph: Mapping[str, Any] = Field(...)
+
+    inputs: Mapping[str, Any] = Field(...)
+    outputs: Optional[Mapping[str, Any]] = None
+
+    status: WorkflowExecutionStatus = WorkflowExecutionStatus.RUNNING
+    error_message: str = Field(default="")
+    total_tokens: int = Field(default=0)
+    total_steps: int = Field(default=0)
+    exceptions_count: int = Field(default=0)
+
+    started_at: datetime = Field(...)
+    finished_at: Optional[datetime] = None
+
+    @property
+    def elapsed_time(self) -> float:
+        """
+        Calculate elapsed time in seconds.
+        If workflow is not finished, use current time.
+        """
+        end_time = self.finished_at or datetime.now(UTC).replace(tzinfo=None)
+        return (end_time - self.started_at).total_seconds()
+
+    @classmethod
+    def new(
+        cls,
+        *,
+        id: str,
+        workflow_id: str,
+        sequence_number: int,
+        type: WorkflowType,
+        workflow_version: str,
+        graph: Mapping[str, Any],
+        inputs: Mapping[str, Any],
+        started_at: datetime,
+    ) -> "WorkflowExecution":
+        return WorkflowExecution(
+            id=id,
+            workflow_id=workflow_id,
+            sequence_number=sequence_number,
+            type=type,
+            workflow_version=workflow_version,
+            graph=graph,
+            inputs=inputs,
+            status=WorkflowExecutionStatus.RUNNING,
+            started_at=started_at,
+        )