Implement FastAPI Temporal MVP pipeline

app/domain/models/asset.py

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+"""Domain asset model."""
+
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Any
+
+from app.domain.enums import AssetType, WorkflowStepName
+
+
+@dataclass(slots=True)
+class Asset:
+    """Business representation of a generated asset."""
+
+    id: int
+    order_id: int
+    asset_type: AssetType
+    step_name: WorkflowStepName | None
+    uri: str
+    metadata_json: dict[str, Any] | None
+    created_at: datetime
+

app/domain/models/order.py

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+"""Domain order model."""
+
+from dataclasses import dataclass
+from datetime import datetime
+
+from app.domain.enums import CustomerLevel, OrderStatus, ServiceMode, WorkflowStepName
+
+
+@dataclass(slots=True)
+class Order:
+    """Business representation of an image order."""
+
+    id: int
+    customer_level: CustomerLevel
+    service_mode: ServiceMode
+    status: OrderStatus
+    model_id: int
+    pose_id: int
+    garment_asset_id: int
+    scene_ref_asset_id: int
+    final_asset_id: int | None
+    workflow_id: str | None
+    current_step: WorkflowStepName | None
+    created_at: datetime
+    updated_at: datetime
+

app/domain/models/review_task.py

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+"""Domain review task model."""
+
+from dataclasses import dataclass
+from datetime import datetime
+
+from app.domain.enums import ReviewDecision, ReviewTaskStatus
+
+
+@dataclass(slots=True)
+class ReviewTask:
+    """Business representation of a review task."""
+
+    id: int
+    order_id: int
+    status: ReviewTaskStatus
+    decision: ReviewDecision | None
+    reviewer_id: int | None
+    selected_asset_id: int | None
+    comment: str | None
+    created_at: datetime
+    updated_at: datetime
+

app/domain/models/workflow_run.py

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+"""Domain workflow run model."""
+
+from dataclasses import dataclass
+from datetime import datetime
+
+from app.domain.enums import OrderStatus, WorkflowStepName
+
+
+@dataclass(slots=True)
+class WorkflowRun:
+    """Business representation of a workflow execution."""
+
+    id: int
+    order_id: int
+    workflow_id: str
+    workflow_type: str
+    status: OrderStatus
+    current_step: WorkflowStepName | None
+    created_at: datetime
+    updated_at: datetime
+

app/domain/models/workflow_step.py

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+"""Domain workflow step model."""
+
+from dataclasses import dataclass
+from datetime import datetime
+from typing import Any
+
+from app.domain.enums import StepStatus, WorkflowStepName
+
+
+@dataclass(slots=True)
+class WorkflowStep:
+    """Business representation of a workflow step attempt."""
+
+    id: int
+    workflow_run_id: int
+    step_name: WorkflowStepName
+    step_status: StepStatus
+    input_json: dict[str, Any] | None
+    output_json: dict[str, Any] | None
+    error_message: str | None
+    started_at: datetime
+    ended_at: datetime | None
+