feat: add bounded kafka ingestion pipeline

src/core/api/routes.py

@@ -3,6 +3,7 @@ import json
 from fastapi import APIRouter, Request, status
 from fastapi.responses import JSONResponse
 
+from core.api.publisher import IngestionQueueFull, KafkaPublishError
 from core.domain.errors import CDRProcessingError
 from core.domain.validation import parse_raw_cdr
 
@@ -49,6 +50,30 @@ async def ingest_raw_cdr(request: Request) -> JSONResponse:
             },
         )
 
+    try:
+        await request.app.state.publisher.publish(
+            payload,
+            key=raw_cdr.raw_id,
+        )
+
+    except IngestionQueueFull:
+        return JSONResponse(
+            status_code=status.HTTP_429_TOO_MANY_REQUESTS,
+            content={
+                "error": "backpressure",
+                "detail": "Ingestion queue is full.",
+            },
+        )
+
+    except KafkaPublishError as exc:
+        return JSONResponse(
+            status_code=status.HTTP_503_SERVICE_UNAVAILABLE,
+            content={
+                "error": "kafka_unavailable",
+                "detail": str(exc),
+            },
+        )
+
     return JSONResponse(
         status_code=status.HTTP_202_ACCEPTED,
         content={