[BUG] rec_sys_personalized_with_trace() access an invalid key

[StefanoNoce]

Required prerequisites

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What version of camel-oasis are you using?

0.2.5

System information

installed via uv

3.11.14 (main, Dec 9 2025, 19:02:23) [Clang 21.1.4 ] linux

Problem description

in oasis/social_platform/recsys.py
in the function rec_sys_personalized_with_trace()

'post_id' is not a valid key for trace -> raise an error

Reproducible example code

slightly modified version of
examples/experiment/twitter_simulation_1M_agents/twitter_simulation_1m.py
using twitter recsys

when calling
await platform.update_rec_table()

Traceback

Traceback (most recent call last):
  File "/home/noce/.local/share/uv/python/cpython-3.11.14-linux-x86_64-gnu/lib/python3.11/asyncio/runners.py", line 190, in run
    return runner.run(main)
           ^^^^^^^^^^^^^^^^
  File "/home/noce/.local/share/uv/python/cpython-3.11.14-linux-x86_64-gnu/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/noce/.local/share/uv/python/cpython-3.11.14-linux-x86_64-gnu/lib/python3.11/asyncio/base_events.py", line 654, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/home/noce/Documents/TG/backend/src/services/simulation_service.py", line 234, in run
    await self.platform.update_rec_table()
  File "/home/noce/Documents/TG/backend/.venv/lib/python3.11/site-packages/oasis/social_platform/platform.py", line 340, in update_rec_table
    new_rec_matrix = rec_sys_personalized_with_trace(
                     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/noce/Documents/TG/backend/.venv/lib/python3.11/site-packages/oasis/social_platform/recsys.py", line 784, in rec_sys_personalized_with_trace
    swap_free_ids = [
                    ^
  File "/home/noce/Documents/TG/backend/.venv/lib/python3.11/site-packages/oasis/social_platform/recsys.py", line 786, in <listcomp>
    if post_id not in rec_post_ids and post_id not in [
                                                      ^
  File "/home/noce/Documents/TG/backend/.venv/lib/python3.11/site-packages/oasis/social_platform/recsys.py", line 787, in <listcomp>
    trace['post_id']
    ~~~~~^^^^^^^^^^^
KeyError: 'post_id'

Expected behavior

Not raising an error

Additional context

trace only have these keys