chore: snapshot workflow migration progress

backend/app/domains/rendering/workflow_executor.py

@@ -25,7 +25,7 @@ from collections import deque
 from dataclasses import dataclass, field
 from typing import Literal
 
-from app.domains.rendering.workflow_schema import WorkflowConfig, WorkflowNode
+from app.domains.rendering.workflow_schema import WorkflowConfig, WorkflowEdge, WorkflowNode
 from app.core.process_steps import StepName
 
 logger = logging.getLogger(__name__)
@@ -40,6 +40,17 @@ class WorkflowContext:
     execution_mode: WorkflowExecutionMode
     workflow_run_id: uuid.UUID | None = None
     ordered_nodes: list[WorkflowNode] = field(default_factory=list)
+    edges: list[WorkflowEdge] = field(default_factory=list)
+
+
+@dataclass(slots=True)
+class WorkflowTaskDispatchSpec:
+    node_id: str
+    task_name: str
+    args: list[str]
+    kwargs: dict
+    task_id: str
+    queue: str | None = None
 
 
 @dataclass(slots=True)
@@ -48,6 +59,38 @@ class WorkflowDispatchResult:
     task_ids: list[str]
     node_task_ids: dict[str, str]
     skipped_node_ids: list[str]
+    task_specs: list[WorkflowTaskDispatchSpec] = field(default_factory=list)
+
+
+class WorkflowTaskSubmissionError(RuntimeError):
+    def __init__(self, message: str, *, submitted_task_ids: list[str] | None = None) -> None:
+        super().__init__(message)
+        self.submitted_task_ids = list(submitted_task_ids or [])
+
+
+def submit_prepared_workflow_tasks(dispatch_result: WorkflowDispatchResult) -> None:
+    """Submit pre-built Celery tasks after DB state has been committed."""
+    from app.tasks.celery_app import celery_app
+
+    submitted_task_ids: list[str] = []
+    for spec in dispatch_result.task_specs:
+        task_options: dict[str, str] = {"task_id": spec.task_id}
+        if spec.queue:
+            task_options["queue"] = spec.queue
+        try:
+            celery_app.send_task(
+                spec.task_name,
+                args=spec.args,
+                kwargs=spec.kwargs,
+                **task_options,
+            )
+        except Exception as exc:
+            raise WorkflowTaskSubmissionError(
+                f"Failed to submit workflow task for node '{spec.node_id}': {exc}",
+                submitted_task_ids=submitted_task_ids,
+            ) from exc
+        submitted_task_ids.append(spec.task_id)
+
 
 
 # ---------------------------------------------------------------------------
@@ -65,7 +108,7 @@ STEP_TASK_MAP: dict[StepName, str] = {
     StepName.STL_CACHE_GENERATE: "app.tasks.step_tasks.process_step_file",
     # ── Thumbnail generation ─────────────────────────────────────────────
     StepName.BLENDER_RENDER: "app.tasks.step_tasks.render_step_thumbnail",
-    StepName.THUMBNAIL_SAVE: "app.tasks.step_tasks.render_step_thumbnail",
+    StepName.THUMBNAIL_SAVE: "app.tasks.step_tasks.render_graph_thumbnail",
     # ── Order line stills & turntables ──────────────────────────────────
     StepName.BLENDER_STILL: "app.domains.rendering.tasks.render_order_line_still_task",
     StepName.BLENDER_TURNTABLE: "app.domains.rendering.tasks.render_turntable_task",
@@ -98,6 +141,7 @@ def prepare_workflow_context(
         execution_mode=execution_mode,
         workflow_run_id=workflow_run_id,
         ordered_nodes=ordered_nodes,
+        edges=list(config.edges),
     )