add Fabric read model rollback activation

Assistant: codex
Assistant-Model: gpt-5.6-sol
Assistant-Session: 01a053ff-1d6f-7fe2-ac1c-a6eb40a42a0c

api/routers/fabric.py

@@ -1,5 +1,6 @@
 from __future__ import annotations
 
+import uuid
 from typing import Any
 
 import httpx
@@ -10,6 +11,8 @@ from sqlalchemy.ext.asyncio import AsyncSession
 from api.database import get_session
 from api.models.fabric_graph import FabricGraphEdge, FabricGraphImport, FabricGraphNode
 from api.schemas.fabric_graph import (
+    FabricGraphActivationRequest,
+    FabricGraphActivationResult,
     FabricGraphEdgeRead,
     FabricGraphImportRead,
     FabricGraphIngestResult,
@@ -19,6 +22,7 @@ from api.schemas.fabric_graph import (
 )
 from api.services.fabric_graph import (
     FabricGraphValidationError,
+    activate_fabric_graph_import,
     ingest_fabric_graph_export,
     record_fabric_graph_error,
     split_graph_ingest_body,
@@ -132,6 +136,34 @@ async def latest_graph_import(
     return FabricGraphImportRead.model_validate(import_run)
 
 
+@router.post(
+    "/graph-exports/{import_id}/activate",
+    response_model=FabricGraphActivationResult,
+)
+async def activate_graph_import(
+    import_id: uuid.UUID,
+    body: FabricGraphActivationRequest | None = None,
+    session: AsyncSession = Depends(get_session),
+) -> FabricGraphActivationResult:
+    request = body or FabricGraphActivationRequest()
+    try:
+        import_run, previous_import_id, activated = await activate_fabric_graph_import(
+            session,
+            import_id,
+            requested_by=request.requested_by,
+        )
+    except ValueError as exc:
+        raise HTTPException(status_code=409, detail=str(exc)) from exc
+    if import_run is None:
+        raise HTTPException(status_code=404, detail=f"Fabric graph import '{import_id}' not found")
+    return FabricGraphActivationResult(
+        import_run=FabricGraphImportRead.model_validate(import_run),
+        previous_import_id=previous_import_id,
+        activated=activated,
+        idempotent=not activated,
+    )
+
+
 @router.get("/graph/nodes", response_model=list[FabricGraphNodeRead])
 async def list_graph_nodes(
     source_repo_slug: str = "railiance-fabric",