The Library selection bar (D148) gets Add tags and select-all of the loaded
shelf, the legacy admin page's bulk Add Tags and select-all checkbox.
Add tags posts {prompt_ids, tags, expected_epoch} to
POST /prompt_manager/bulk/tags: in one BEGIN IMMEDIATE transaction the server
checks the storage epoch, normalizes the names as image tags are, gives each
Library parent only the names it lacks (casefold), finds or inserts tag rows
by exact name only when some prompt gets them, and skips prompts that would
pass 20 tags. Prompt tags only. Both bulk/tags forms refuse a non-object body
with 400.
Ctrl/Cmd+A in the grid and "Select all N loaded" in the bar select every
loaded prompt; the offer follows each loaded batch.
Closes#442
Vito Sansevero
ebd43a8140