fix: flush in-memory chat history buffer to Redis on recovery#65
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When Redis has a transient failure, messages stored in the in-memory fallback were invisible on subsequent reads once Redis recovered, causing chat history to intermittently show only some messages. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
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Summary
_flush_fallback()method that replays buffered messages to Redis via pipeline when the connection recovers, called from bothappend_message()andget_history().clear_history()to always clear the in-memory fallback buffer alongside Redis.Test plan
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