Follow-up to the cherry-picked fix: the same UnicodeEncodeError bind
failure was live at sibling sites the PR didn't cover —
- api_content sidecar (append_message, _insert_message_rows,
set_latest_user_api_content): bound raw; a surrogate in the composed
api_content aborted the whole row/UPDATE. Scrubbing is wire-accurate:
the conversation loop already scrubs every outgoing payload, so the
scrubbed form IS what was sent.
- tool_name (both INSERT sites): raw bind.
- sanitize_title: session titles from LLM title generation or /title
could carry surrogates; scrub before validation.
E2E-verified each site raised UnicodeEncodeError on main and persists
after this commit. Tests added for all five paths.
653a95f9fa