Function scope_capacity_ok

Scripts/ButSystem.py:1243–1252

Enforce a maximum of 20 users per scope (plus 1 admin = 21).

(username: str, is_admin_flag: bool, scope: str)

        FROM dm_messages
        WHERE recipient=? AND read_at IS NULL AND (deleted_at IS NULL OR deleted_at='')
        GROUP BY sender
    """, (me,)).fetchall()
    conn.close()
    by = {r["sender"]: int(r["c"]) for r in rows} if rows else {}
    return sum(by.values()), by

# ---------------------------
# Session key
# ---------------------------

def load_or_create_session_key() -> str:
    """load_or_create_session_key.