Preserve connector source runtime evidence

src/govoplan_datasources/backend/router.py

@@ -31,9 +31,12 @@ from govoplan_datasources.backend.schemas import (
     DatasourceListResponse,
     DatasourceMaterializationListResponse,
     DatasourceMaterializationResponse,
+    DatasourceOriginHealthResponse,
     DatasourceOriginListResponse,
+    DatasourceOriginPushdownResponse,
     DatasourceOriginRegisterRequest,
     DatasourceOriginResponse,
+    DatasourcePreviewDiagnosticResponse,
     DatasourcePreviewResponse,
     DatasourceResponse,
     DatasourceRetireResponse,
@@ -383,6 +386,8 @@ def api_preview_datasource(
     offset: int = Query(default=0, ge=0),
     consistency: str = Query(default="current", pattern="^(current|live|frozen)$"),
     materialization_ref: str | None = Query(default=None, max_length=120),
+    max_bytes: int = Query(default=1_000_000, ge=1_024, le=20_000_000),
+    timeout_ms: int = Query(default=2_000, ge=100, le=10_000),
     session: Session = Depends(get_session),
     principal: ApiPrincipal = Depends(get_api_principal),
 ) -> DatasourcePreviewResponse:
@@ -397,6 +402,8 @@ def api_preview_datasource(
                 consistency=consistency,  # type: ignore[arg-type]
                 limit=limit,
                 offset=offset,
+                max_bytes=max_bytes,
+                timeout_ms=timeout_ms,
             ),
         )
     except DatasourceError as exc:
@@ -411,6 +418,20 @@ def api_preview_datasource(
             if result.materialization
             else None
         ),
+        returned_bytes=result.returned_bytes,
+        elapsed_ms=result.elapsed_ms,
+        effective_row_limit=result.effective_row_limit,
+        effective_byte_limit=result.effective_byte_limit,
+        effective_timeout_ms=result.effective_timeout_ms,
+        diagnostics=[
+            DatasourcePreviewDiagnosticResponse(
+                severity=item.severity,
+                code=item.code,
+                message=item.message,
+                details=dict(item.details),
+            )
+            for item in result.diagnostics
+        ],
     )
 
 
@@ -662,6 +683,23 @@ def _origin_response(item: DatasourceOrigin) -> DatasourceOriginResponse:
         updated_at=item.updated_at.isoformat() if item.updated_at else None,
         capabilities=list(item.capabilities),
         metadata=dict(item.metadata),
+        source_mode=item.source_mode,
+        pushdown=DatasourceOriginPushdownResponse(
+            projections=item.pushdown.projections,
+            pagination=item.pushdown.pagination,
+            filters=list(item.pushdown.filters),
+            aggregations=list(item.pushdown.aggregations),
+            sorting=list(item.pushdown.sorting),
+        ),
+        health=DatasourceOriginHealthResponse(
+            status=item.health.status,
+            code=item.health.code,
+            summary=item.health.summary,
+            checked_at=(
+                item.health.checked_at.isoformat() if item.health.checked_at else None
+            ),
+            details=dict(item.health.details),
+        ),
     )