A chat's title, its short description, a pin, unsent attachments and the document last shown in the preview panel are kept with the chat. This page says what each is, where you see it and what deleting does.
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Every chat is saved as its own conversation. Beside it, Haruno keeps a few small details about the chat. You see most of them in History.
Title
A chat's title is your first message, shortened to about 60 characters. You do not have to name anything.
To give a chat a better name, open More actions on its row in History and choose Rename. A box says: "Enter a new name for this chat. Leave it empty to restore the automatic name."
Description
Under the title, a History row shows a sentence or two about what the chat was about. Haruno writes it for you.
It is written in the language the app is set to, even if the chat was in another language.
Haruno writes one once a chat has at least two messages. To do that it sends the start of the conversation to its service, so you need to be signed in.
It is written again after the chat has grown by about six messages, so it stays close to the truth.
Pin
More actions ▸ Pin to top keeps a chat in a Pinned group at the top of History. Unpin puts it back.
Unsent attachments
Files you attached but have not sent yet are saved with the chat. Open it again from History and the chips are back. See Attachments.
The document in the preview panel
Haruno remembers which document the Preview panel showed for each chat.
When a chat is branched
A branch is listed at the top of History with the time it was made, and it keeps that position even after you write in it. It starts with the same unsent attachments and preview document as the chat it was copied from. Its name is the original's name with "(branch)". The original's pin and description are not copied. See Branching a chat.
Archive and delete
Archive moves the chat out of the main list. Everything about it is kept, and it comes back with the same name, pin and details when you restore it.
Delete removes the chat for good. History asks first: it says the chat will be permanently removed from your history. Its title, description, pin, attachments and preview document go with it.
Delete local data in Settings removes these details along with everything else Haruno keeps on this PC. Files in your own project folders are left alone.
What is not listed
History shows your own chats. These are not listed there:
the conversation of an automation, which you open from Hooks;
the sub-tasks Haruno starts inside a chat.
Each chat keeps its own details
Haruno keeps a chat's name, pin and other details with that chat's own saved conversation. Renaming or pinning one chat never changes another, even when two chats look alike.