Tie images to their prompts - move delete button next to prompt
Add confirm deletion state to guard against fat fingering - highlight the image to be deleted when the confirm modal is displayed
Show prompts for existing images with their submitted text (readonly to keep it simple)
Add re-generate button next to image prompt - which: A. deletes existing image, B. triggers a re-generation with the same text prompt and C. and shows some visual confirmation of the action
Add update param for generate-images route so that the correct update versus insert SQL statement is used.