# Simplify session attach + add rename

**Date:** 2026-06-10
**Status:** Approved

## Goal

Streamline session handling with two changes:

1. Remove the redundant Resume (`Shift+R`) binding — attach already auto-resumes.
2. Add a Rename action (`r`) to relabel the selected session.

## Background

Each session row carries two names:

- `tmux_session_name` (`hqt-{id}`) — the stable internal identifier used to
  target the tmux window and as the unique DB key. Never user-facing.
- `nickname` — an optional display label shown in the session list and in the
  tmux window label (falls back to `tmux_session_name` when unset).

`attach_session()` (`src/hqt/sessions/service.py`) already handles every window
state: alive → switch to it; dead pane or missing window → respawn via the
fallback ladder (`_respawn_with_fallback`) then attach. The `resume_session()`
method and its `R,shift+r` binding only duplicate that respawn-then-attach path,
so Resume is dead weight.

## Change 1 — Remove the Resume binding (deletion only)

- **`src/hqt/tui/app.py`**: delete the `Binding("R,shift+r", "resume_session",
  "Resume")` entry and the `action_resume_session()` method.
- **`src/hqt/sessions/service.py`**: delete the `resume_session()` method.

Keep `_respawn_with_fallback()` — `attach_session()` depends on it. Attach
behavior is unchanged; Enter becomes the single way into a session, resuming
transparently when the window is dead or gone.

## Change 2 — Add Rename (`r`)

### Service

New synchronous method on `SessionService` (pure DB write — no tmux call):

```python
def rename_session(self, session_id: int, nickname: str | None) -> None:
    sess = self.db.get(Session, session_id)
    sess.nickname = nickname or None  # empty -> None -> label falls back to tmux name
    self.db.commit()
```

The next 3-second poll (`sync_window_labels()`) reads the updated `nickname` and
refreshes the tmux window label automatically — no immediate label push needed.

A small `get_session(session_id) -> Session | None` accessor is added so the app
layer can read the current nickname to prefill the dialog without reaching into
`db` directly.

### Modal

New `RenameSessionScreen(ModalScreen[str | None])` in
`src/hqt/tui/screens/rename_session.py`, mirroring `ProjectFormScreen`:

- Titled dialog with a single `Input` prefilled with the current nickname.
- OK / Cancel buttons in a `.dialog-actions` row.
- OK dismisses with the stripped input value; Cancel dismisses with `None`.

### App wiring (`src/hqt/tui/app.py`)

- Add `Binding("r", "rename_session", "Rename")`.
- `action_rename_session()`:
  - Get the selected session id; warn ("Select a session first") if none.
  - Load the session via `get_session()` to read its current nickname.
  - Push `RenameSessionScreen` prefilled with that nickname.
  - On a non-`None` dismiss, call `rename_session()` then `_refresh_sessions()`.

## Testing

- `rename_session` sets `nickname`; an empty string clears it to `None`.
- Remove or update any test referencing `resume_session` or the Resume binding.
- Pilot test: press `r`, type a name, confirm, assert the session's nickname /
  displayed label updates.

## Out of scope

- No change to `tmux_session_name`.
- No new harness logic.
- No DB migration (reuses the existing `nickname` column).