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fix(session): use second-level timestamp granularity in legacy dedup key

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The _normalized_message_timestamp_for_key helper was preserving
microsecond precision (%.6f). When the same message is persisted by
both the WebUI sidecar JSON writer and the Hermes agent state.db
writer, their timestamps can differ by a few microseconds, causing
_session_message_merge_key to produce different keys for the same
logical message and letting both copies survive the dedup pass in
merge_session_messages_append_only.

Truncating to second-level granularity collapses sub-second drift to
the same key, so the duplicate is suppressed correctly.

Fixes #2616
This commit is contained in:
manji
2026-05-20 07:13:55 +00:00
parent 9c983e693a
commit ff0aa69d5f
1 changed files with 4 additions and 3 deletions
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api/models.py
+4 -3
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@@ -2495,9 +2495,10 @@ def _normalized_message_timestamp_for_key(value):
timestamp = float(value)
except (TypeError, ValueError):
return str(value)
if timestamp.is_integer():
return str(int(timestamp))
return ("%.6f" % timestamp).rstrip("0").rstrip(".")
# Truncate to second-level granularity so that sub-second drift between
# the sidecar JSON write and the state.db created_at write does not cause
# the legacy dedup key to differ for the same logical message.
return str(int(timestamp))
def _message_timestamp_as_float(msg):