diff --git a/src/murfey/server/api/processing_parameters.py b/src/murfey/server/api/processing_parameters.py
index dc81b56d9..fa359c322 100644
--- a/src/murfey/server/api/processing_parameters.py
+++ b/src/murfey/server/api/processing_parameters.py
@@ -1,27 +1,29 @@
 from logging import getLogger
+from typing import Optional
 
-from fastapi import APIRouter
+from fastapi import APIRouter, Depends
 from pydantic import BaseModel
 from sqlmodel import Session, select
 
+from murfey.server.api.auth import MurfeySessionID, validate_token
 from murfey.server.murfey_db import murfey_db
 from murfey.util.db import SessionProcessingParameters
 
 logger = getLogger("murfey.server.api.processing_parameters")
 
-router = APIRouter()
+router = APIRouter(dependencies=[Depends(validate_token)])
 
 
 class EditableSessionProcessingParameters(BaseModel):
-    gain_ref: str
-    dose_per_frame: float
-    eer_fractionation_file: str
-    symmetry: str
+    gain_ref: str = ""
+    dose_per_frame: Optional[float] = None
+    eer_fractionation_file: str = ""
+    symmetry: str = ""
 
 
-@router.get("sessions/{session_id}/session_processing_parameters")
+@router.get("/sessions/{session_id}/session_processing_parameters")
 def get_session_processing_parameters(
-    session_id: int, db: Session = murfey_db
+    session_id: MurfeySessionID, db: Session = murfey_db
 ) -> EditableSessionProcessingParameters:
     proc_params = db.exec(
         select(SessionProcessingParameters).where(
@@ -34,3 +36,28 @@ def get_session_processing_parameters(
         eer_fractionation_file=proc_params.eer_fractionation_file,
         symmetry=proc_params.symmetry,
     )
+
+
+@router.post("/sessions/{session_id}/session_processing_parameters")
+def set_session_processing_parameters(
+    session_id: MurfeySessionID,
+    edited_parameters: EditableSessionProcessingParameters,
+    db: Session = murfey_db,
+) -> EditableSessionProcessingParameters:
+    proc_params = db.exec(
+        select(SessionProcessingParameters).where(
+            SessionProcessingParameters.session_id == session_id
+        )
+    ).one()
+    proc_params.gain_ref = edited_parameters.gain_ref or proc_params.gain_ref
+    proc_params.dose_per_frame = (
+        edited_parameters.dose_per_frame or proc_params.dose_per_frame
+    )
+    proc_params.eer_fractionation_file = (
+        edited_parameters.eer_fractionation_file or proc_params.eer_fractionation_file
+    )
+    proc_params.symmetry = edited_parameters.symmetry or proc_params.symmetry
+    db.add(proc_params)
+    db.commit()
+    db.close()
+    return edited_parameters