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The recipientAddressCache grows with every unique ServiceId resolved via findByServiceId() and entries are never evicted. In a long-running daemon handling group messages from many contacts, this map grows monotonically. Replace the unbounded HashMap with an LRU-bounded LinkedHashMap (access order, max 2000 entries). Evicted entries are reloaded from SQLite on next access via an indexed lookup, so correctness is preserved. Claude-Session: https://claude.ai/code/session_01HHzM2XLKQoX9iraEdhoh3h Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>