DAQ/GUI: updated beam location to use fixed exp and gain. This can be set now from teh GUi and stored in REDIS.

src/aare/daq/server.py

@@ -529,6 +529,20 @@ async def save_abr_meas_pos(token: str = Depends(oauth2_scheme)):
     daq.save_abr_meas_pos()
     return "OK"
 
+@app.post("/beamline/save_beam_location_camera_setting")
+async def save_beam_location_camera_setting(token: str = Depends(oauth2_scheme)):
+    """
+    Persist the camera's current gain/exposure as the beam-location preset for
+    the current zoom (stored in Redis, re-applied on future zoom changes).
+
+    Returns:
+        "OK" on success.
+    """
+    auth.check_jwt_rw(cfg, auth.parse_token(token))
+    daq.save_beam_location_camera_setting()
+    return "OK"
+
+
 @app.post("/beamline/anneal")
 async def anneal(time_s: float, token: str = Depends(oauth2_scheme)):
     """