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backend/app/api/pipelines/get_dialog_history.py

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+from __future__ import annotations
+
+from uuid import UUID
+
+from fastapi import APIRouter, Depends, HTTPException, Query, Request, status
+from sqlalchemy.ext.asyncio import AsyncSession
+
+from app.core.database.session import get_session
+from app.models import User
+from app.schemas.pipeline_chat_sch import (
+    PipelineDialogHistoryResponse,
+    PipelineDialogMessageResponse,
+)
+from app.services.pipeline_dialog_service import DialogAccessError, PipelineDialogService
+from app.utils.business_logger import log_business_event
+from app.utils.token_manager import get_current_user
+
+
+router = APIRouter(tags=["Pipelines"])
+
+
+@router.get("/dialogs/{dialog_id}/history", response_model=PipelineDialogHistoryResponse)
+async def get_pipeline_dialog_history(
+    dialog_id: UUID,
+    request: Request,
+    limit: int = Query(default=30, ge=1, le=200),
+    offset: int = Query(default=0, ge=0),
+    session: AsyncSession = Depends(get_session),
+    current_user: User = Depends(get_current_user),
+):
+    trace_id = getattr(request.state, "traceId", None)
+    dialog_service = PipelineDialogService(session)
+    try:
+        dialog, messages = await dialog_service.get_history(
+            dialog_id=dialog_id,
+            user_id=current_user.id,
+            limit=limit,
+            offset=offset,
+        )
+    except DialogAccessError as exc:
+        detail = str(exc)
+        log_business_event(
+            "pipeline_dialog_history_rejected",
+            trace_id=trace_id,
+            user_id=str(current_user.id),
+            dialog_id=str(dialog_id),
+            reason=detail,
+        )
+        if "denied" in detail:
+            raise HTTPException(status_code=status.HTTP_403_FORBIDDEN, detail=detail) from exc
+        raise HTTPException(status_code=status.HTTP_404_NOT_FOUND, detail=detail) from exc
+
+    response = PipelineDialogHistoryResponse(
+        dialog_id=dialog.id,
+        title=dialog.title,
+        messages=[
+            PipelineDialogMessageResponse(
+                id=message.id,
+                role=message.role.value,
+                content=message.content,
+                assistant_payload=message.assistant_payload,
+                created_at=message.created_at,
+            )
+            for message in messages
+        ],
+    )
+
+    log_business_event(
+        "pipeline_dialog_history_viewed",
+        trace_id=trace_id,
+        user_id=str(current_user.id),
+        dialog_id=str(dialog.id),
+        limit=limit,
+        offset=offset,
+        message_count=len(response.messages),
+    )
+
+    return response