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fix(gateway): preserve original transcript when /compress rotation is skipped

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The manual /compress handler called rewrite_transcript() unconditionally on
the session id returned by _compress_context(). When rotation does not occur
(e.g. _session_db unavailable, or the DB split raised), session_id is unchanged
and rewrite_transcript() DELETEs the original messages and replaces them with
only the compressed summary — permanent data loss (#44794, #39704).

Guard the rewrite on actual rotation: only overwrite when _compress_context
produced a new session id. Otherwise leave the original transcript intact and
log a warning.
This commit is contained in:
teknium1 2026-06-18 11:35:43 -07:00 • committed by Teknium
parent 81ff916e57
commit 0879d5cc8f
1 changed files with 17 additions and 2 deletions
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19
gateway/slash_commands.py
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@ -2588,14 +2588,29 @@ class GatewaySlashCommandsMixin:
# session_id for the continuation. Write the compressed messages
# into the NEW session so the original history stays searchable.
new_session_id = tmp_agent.session_id
if new_session_id != session_entry.session_id:
rotated = new_session_id != session_entry.session_id
if rotated:
session_entry.session_id = new_session_id
self.session_store._save()
self._sync_telegram_topic_binding(
source, session_entry, reason="compress-command",
)
self.session_store.rewrite_transcript(new_session_id, compressed)
# Only rewrite the transcript when rotation actually produced a
# NEW session id. If _compress_context could not rotate (e.g.
# _session_db unavailable, or the DB split raised), session_id
# is unchanged and rewrite_transcript() would DELETE the
# original messages and replace them with only the compressed
# summary — permanent data loss (#44794, #39704). In that case
# leave the original transcript intact.
if rotated:
self.session_store.rewrite_transcript(new_session_id, compressed)
else:
logger.warning(
"Manual /compress: session rotation did not occur "
"(session_id unchanged) — preserving original transcript "
"instead of overwriting it (#44794)."
)
# Reset stored token count — transcript changed, old value is stale
self.session_store.update_session(
session_entry.session_key, last_prompt_tokens=0