core/memory+cli: session rename, delete, and export

Add MemoryStore rename/delete with explicit message cleanup. Slash
commands /rename, /delete (confirm), /export md|json write transcripts
from DB; deleting the current session starts a fresh empty one.

src/plyngent/cli/export.py

@@ -0,0 +1,114 @@
+from __future__ import annotations
+
+from typing import TYPE_CHECKING
+
+import msgspec
+from msgspec import UNSET
+
+from plyngent.lmproto.openai_compatible.model import (
+    AssistantChatMessage,
+    AssistantFunctionToolCall,
+    ToolChatMessage,
+    UserChatMessage,
+)
+
+if TYPE_CHECKING:
+    from collections.abc import Sequence
+    from datetime import datetime
+    from pathlib import Path
+
+    from plyngent.lmproto.openai_compatible.model import AnyChatMessage
+
+
+def _iso(value: datetime | None) -> str | None:
+    if value is None:
+        return None
+    return value.isoformat()
+
+
+def session_export_payload(
+    *,
+    sid: int,
+    name: str,
+    workspace: str | None,
+    created_at: datetime | None,
+    updated_at: datetime | None,
+    messages: Sequence[AnyChatMessage],
+) -> dict[str, object]:
+    """Build a JSON-serializable dict for a session transcript."""
+    return {
+        "session_id": sid,
+        "name": name,
+        "workspace": workspace,
+        "created_at": _iso(created_at),
+        "updated_at": _iso(updated_at),
+        "messages": [msgspec.to_builtins(m) for m in messages],
+    }
+
+
+def encode_session_export_json(payload: dict[str, object]) -> str:
+    return msgspec.json.encode(payload).decode()
+
+
+def format_session_export_md(
+    messages: Sequence[AnyChatMessage],
+    *,
+    sid: int,
+    name: str,
+    workspace: str | None = None,
+) -> str:
+    """Render a simple markdown transcript."""
+    lines: list[str] = [f"# Session {sid}: {name}"]
+    if workspace:
+        lines.append(f"workspace: `{workspace}`")
+    lines.append("")
+    for message in messages:
+        lines.extend(_format_message_md(message))
+        lines.append("")
+    return "\n".join(lines).rstrip() + "\n"
+
+
+def _format_message_md(message: AnyChatMessage) -> list[str]:
+    if isinstance(message, UserChatMessage):
+        return ["## user", "", message.content]
+    if isinstance(message, AssistantChatMessage):
+        parts: list[str] = ["## assistant", ""]
+        reasoning = message.reasoning_content
+        if isinstance(reasoning, str) and reasoning:
+            parts.extend(["### reasoning", "", reasoning, ""])
+        if isinstance(message.content, str) and message.content:
+            parts.append(message.content)
+        tool_calls = message.tool_calls
+        if tool_calls is not UNSET and tool_calls:
+            names: list[str] = []
+            for call in tool_calls:
+                if isinstance(call, AssistantFunctionToolCall):
+                    names.append(call.function.name)
+                else:
+                    names.append("custom")
+            parts.append(f"*tool_calls: {', '.join(names)}*")
+        # Header only ("## assistant", "") with no body yet.
+        if len(parts) <= 2:  # noqa: PLR2004
+            parts.append("(empty)")
+        return parts
+    if isinstance(message, ToolChatMessage):
+        return [f"## tool (`{message.tool_call_id}`)", "", message.content]
+    role = getattr(message, "role", type(message).__name__)
+    content = getattr(message, "content", "")
+    return [f"## {role}", "", str(content)]
+
+
+def resolve_export_path(sid: int, fmt: str, path_arg: str | None) -> Path:
+    from pathlib import Path
+
+    if path_arg:
+        return Path(path_arg).expanduser()
+    ext = "md" if fmt == "md" else "json"
+    return Path.cwd() / f"session-{sid}.{ext}"
+
+
+def write_export_file(path: Path, text: str) -> Path:
+    """Write export text to ``path`` (sync helper; CLI is not on hot async I/O)."""
+    _ = path.parent.mkdir(parents=True, exist_ok=True)
+    _ = path.write_text(text, encoding="utf-8")
+    return path.resolve()

src/plyngent/cli/readline_setup.py

@@ -24,6 +24,9 @@ SLASH_COMMANDS: tuple[str, ...] = (
     "/sessions",
     "/new",
     "/resume",
+    "/rename",
+    "/delete",
+    "/export",
     "/compact",
     "/provider",
     "/model",
@@ -36,6 +39,7 @@ SLASH_COMMANDS: tuple[str, ...] = (
 )
 
 _ON_OFF_ARGS: tuple[str, ...] = ("on", "off")
+_EXPORT_ARGS: tuple[str, ...] = ("md", "json")
 
 
 def history_path() -> Path:
@@ -78,6 +82,8 @@ def _argument_options(state: ReplState, command: str, text: str) -> list[str]:
         return filter_prefix(text, sorted(state.provider.models.keys()))
     if command in {"/tools", "/stream", "/verbose"}:
         return filter_prefix(text, list(_ON_OFF_ARGS))
+    if command == "/export":
+        return filter_prefix(text, list(_EXPORT_ARGS))
     if command == "/resume":
         return []
     return []

src/plyngent/cli/repl.py

@@ -31,6 +31,9 @@ Commands:
   /sessions          List sessions for this workspace (newest first)
   /new [name]        Start a new session (bound to workspace)
   /resume [id]       Resume session id, or latest for this workspace if omitted
+  /rename <name>     Rename the current session
+  /delete [id]       Hard-delete a session (confirm; current → new empty)
+  /export [md|json] [path]  Export session transcript from DB
   /compact [name]    Soft-compact + model-summarize into a new session
   /provider [name]   Show or switch provider
   /model [id]        Show or switch model
@@ -108,6 +111,113 @@ async def _cmd_new(state: ReplState, arg: str) -> None:
     click.echo(f"new session id={state.session_id} name={name}")
 
 
+async def _cmd_rename(state: ReplState, arg: str) -> None:
+    name = arg.strip()
+    if not name:
+        click.echo("usage: /rename <name>")
+        return
+    try:
+        row = await state.rename_current_session(name)
+    except ValueError as exc:
+        click.echo(f"error: {exc}")
+        return
+    click.echo(f"renamed session {row.sid} -> {row.name}")
+
+
+async def _cmd_delete(state: ReplState, arg: str) -> None:
+    from plyngent.prompting import NonInteractiveError, confirm_async
+
+    token = arg.strip()
+    if token:
+        try:
+            sid = int(token)
+        except ValueError:
+            click.echo("usage: /delete [session id]")
+            return
+    else:
+        if state.session_id is None:
+            click.echo("error: no active session")
+            return
+        sid = state.session_id
+    try:
+        allowed = await confirm_async(
+            f"Permanently delete session {sid} and all messages?",
+            default=False,
+        )
+    except NonInteractiveError:
+        click.echo("error: delete requires interactive confirm (or TTY)")
+        return
+    if not allowed:
+        click.echo("delete cancelled")
+        return
+    try:
+        was_current = await state.delete_session_and_maybe_replace(sid)
+    except ValueError as exc:
+        click.echo(f"error: {exc}")
+        return
+    if was_current:
+        click.echo(f"deleted session {sid}; new session {state.session_id}")
+    else:
+        click.echo(f"deleted session {sid}")
+
+
+async def _cmd_export(state: ReplState, arg: str) -> None:
+    from plyngent.cli.export import (
+        encode_session_export_json,
+        format_session_export_md,
+        resolve_export_path,
+        session_export_payload,
+        write_export_file,
+    )
+
+    if state.session_id is None:
+        click.echo("error: no active session")
+        return
+    parts = arg.split()
+    fmt = "md"
+    path_arg: str | None = None
+    if parts:
+        first = parts[0].lower()
+        if first in {"md", "markdown", "json"}:
+            fmt = "json" if first == "json" else "md"
+            path_arg = parts[1] if len(parts) > 1 else None
+        else:
+            path_arg = parts[0]
+            if len(parts) > 1:
+                click.echo("usage: /export [md|json] [path]")
+                return
+    row = await state.memory.get_session(state.session_id)
+    if row is None:
+        click.echo(f"error: session not found: {state.session_id}")
+        return
+    messages = await state.memory.list_messages(state.session_id)
+    out_path = resolve_export_path(state.session_id, fmt, path_arg)
+    if fmt == "json":
+        text = encode_session_export_json(
+            session_export_payload(
+                sid=row.sid,
+                name=row.name,
+                workspace=row.workspace,
+                created_at=row.created_at,
+                updated_at=row.updated_at,
+                messages=messages,
+            )
+        )
+    else:
+        text = format_session_export_md(
+            messages,
+            sid=row.sid,
+            name=row.name,
+            workspace=row.workspace,
+        )
+    try:
+        written = write_export_file(out_path, text)
+    except OSError as exc:
+        click.echo(f"error: write failed: {exc}")
+        return
+    click.echo(f"exported session {row.sid} ({fmt}) -> {written}")
+
+
 async def _cmd_resume(state: ReplState, arg: str) -> None:
     if not arg.strip():
         mode = await state.resume_latest_or_new()
@@ -321,6 +431,9 @@ async def _dispatch_slash(state: ReplState, command: str, arg: str) -> bool:
         "history": lambda: _cmd_history(state, arg),
         "sessions": lambda: _cmd_sessions(state),
         "new": lambda: _cmd_new(state, arg),
+        "rename": lambda: _cmd_rename(state, arg),
+        "delete": lambda: _cmd_delete(state, arg),
+        "export": lambda: _cmd_export(state, arg),
         "resume": lambda: _cmd_resume(state, arg),
         "compact": lambda: _cmd_compact(state, arg),
         "provider": lambda: _cmd_provider(state, arg),

src/plyngent/cli/state.py

@@ -120,6 +120,26 @@ class ReplState:
         self.session_id = session.sid
         self.agent = self._make_agent()
 
+    async def rename_current_session(self, name: str) -> SessionRow:
+        if self.session_id is None:
+            msg = "no active session"
+            raise ValueError(msg)
+        return await self.memory.rename_session(self.session_id, name)
+
+    async def delete_session_and_maybe_replace(self, sid: int) -> bool:
+        """Hard-delete ``sid``. If it was current, start a new empty session.
+
+        Returns True when the deleted session was the active one.
+        """
+        was_current = self.session_id == sid
+        ok = await self.memory.delete_session(sid)
+        if not ok:
+            msg = f"session not found: {sid}"
+            raise ValueError(msg)
+        if was_current:
+            await self.new_session()
+        return was_current
+
     async def resume_session(self, session_id: int) -> None:
         """Load a session; on workspace mismatch, prompt keep / rebind / abort."""
         from plyngent.cli.limits import prompt_workspace_mismatch

src/plyngent/memory/database/store.py

@@ -5,7 +5,7 @@ from pathlib import Path
 from typing import TYPE_CHECKING, Self
 
 import msgspec
-from sqlalchemy import select, text
+from sqlalchemy import delete, select, text
 from sqlalchemy.ext.asyncio import AsyncEngine, AsyncSession, async_sessionmaker
 
 from plyngent.config.models import DatabaseConfig
@@ -21,6 +21,7 @@ if TYPE_CHECKING:
 DEFAULT_USER_NAME = "local"
 DEFAULT_USER_EMAIL = "local@localhost"
 DEFAULT_USER_PASSWORD_HASH = ""
+_SESSION_NAME_MAX = 64
 
 
 def normalize_workspace(path: str | Path | None) -> str | None:
@@ -175,6 +176,38 @@ class MemoryStore:
             await session.refresh(row)
             return row
 
+    async def rename_session(self, sid: int, name: str) -> Session:
+        """Rename a session (max 64 characters, non-empty after strip)."""
+        cleaned = name.strip()
+        if not cleaned:
+            msg = "session name must be non-empty"
+            raise ValueError(msg)
+        if len(cleaned) > _SESSION_NAME_MAX:
+            msg = f"session name too long (max {_SESSION_NAME_MAX})"
+            raise ValueError(msg)
+        async with self._session_factory() as session:
+            row = await session.get(Session, sid)
+            if row is None:
+                msg = f"session not found: {sid}"
+                raise ValueError(msg)
+            row.name = cleaned
+            row.updated_at = datetime.now(UTC)
+            await session.commit()
+            await session.refresh(row)
+            return row
+
+    async def delete_session(self, sid: int) -> bool:
+        """Hard-delete a session and its messages. Returns False if missing."""
+        async with self._session_factory() as session:
+            row = await session.get(Session, sid)
+            if row is None:
+                return False
+            # Explicit message delete: SQLite FK cascade may be off without PRAGMA.
+            _ = await session.execute(delete(Message).where(Message.sid == sid))
+            await session.delete(row)
+            await session.commit()
+            return True
+
     async def append_message(self, sid: int, message: AnyChatMessage) -> Message:
         """Append a chat message to a session with the next sequence number."""
         data = msgspec.to_builtins(message)