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app/api/routes_onchain.py

@@ -16,7 +16,7 @@ why there is no tenant_id to enforce here.
 
 import logging
 
-from fastapi import APIRouter, Depends, HTTPException
+from fastapi import APIRouter, Depends, HTTPException, Response
 from pydantic import BaseModel, field_validator
 from sqlalchemy.orm import Session
 
@@ -68,6 +68,7 @@ class RationaleResponse(BaseModel):
 @router.post("/onchain/rationale", status_code=201)
 async def persist_rationale(
     req: RationaleRequest,
+    response: Response,
     db: Session = Depends(get_db),
 ):
     """Store the plaintext behind an anchored `rationale_hash`.
@@ -94,6 +95,11 @@ async def persist_rationale(
                     "an anchored hash's preimage cannot be overwritten"
                 ),
             )
+        # The route decorator's status_code=201 is FastAPI's default for
+        # every plain-dict return from this handler, including this one --
+        # it must be overridden explicitly here or a replayed post reports
+        # itself as newly Created.
+        response.status_code = 200
         return {"status": "already_recorded", "rationale_hash": req.rationale_hash}
 
     row = OnchainRationaleDB(