Problem with batch operations when there are too much observations

[pisum]

for moderators or staff, it might be time to consolidate this and similar threads, such as:

• https://forum.inaturalist.org/t/bulk-edit-performance-issues/9151
• https://forum.inaturalist.org/t/getting-error-message-when-batch-editing-more-than-100-observations/42533
• https://forum.inaturalist.org/t/batch-edit-save-gives-error/51961