does not persist attachments (but Attachment.new available)

vanilla sql to export as json
 - reactions:
  - code_log

 - samples:
   - residues
   - elemental_compositions
   - reactions_starting_material_sample
   - reactions_solvent_sample
   - reactions_reactant_sample
   - reactions_product_sample
   - code_log
   - svg data (sample or molecule)

 - analyses:
   - attachments (no files)