Move the `scratch` field in nwb to metadata json

[hanhou]

As a temporary solution, I previously stored session-related metadata in the nwb.scratch field: https://github.com/AllenNeuralDynamics/dynamic-foraging-task/blob/2fea58cc170beb75d6d92e31a9d7253e26c6bf57/src/foraging_gui/TransferToNWB.py#L153-L197

We should relocate all of them to session.json etc.

related issues:

• https://github.com/AllenNeuralDynamics/aind-behavior-blog/discussions/408

@alexpiet @XX-Yin @Ahad-Allen

[XX-Yin]

I have asked Saskia where to store these fields in the session.json. waiting for response

[hanhou]

also tagging @hagikent here as he will be working on backfilling metadata json from previously generated nwbs.

[hanhou]

I have asked Saskia where to store these fields in the session.json. waiting for response

My understanding is:

• trials and water info --> https://github.com/AllenNeuralDynamics/aind-data-schema/blob/319bdcb64157f83d242211f1adb843153831c948/src/aind_data_schema/core/session.py#L521-L525
• all other performance-related fields --> output_parameters: https://github.com/AllenNeuralDynamics/aind-data-schema/blob/319bdcb64157f83d242211f1adb843153831c948/src/aind_data_schema/core/session.py#L520
• Optogenetics-related --> should go into stimulus_parameters of PhotoStimulation

What I'm not sure about:

• Weights-related info --> should go into subject or session?

[XX-Yin]

I know they can go to stimulus_epoch, but it does not make sense to me. These parameters should be for that session instead of for a specific stimulus (e.g. we have auditory stimulus and optogenetics stimulus, but foraging efficiency, total reward, finish rate ... are for that session instead of for auditory stimulus or optogenetics).