A single NUL (U+0000) in model/tool output (e.g. a truncated multibyte
read of a web page) is rejected by Postgres in BOTH the content (text) and
toolCalls/metadata (jsonb) columns, so it failed EVERY write of the
streaming assistant row ("invalid input syntax for type json") and silently
dropped the turn's content from the DB while the live stream still showed it.
- add stripNulChars: deep-strips NUL from all strings, returns the same
reference when there is nothing to strip (no needless clone)
- apply it at the flushAssistant choke point (covers content + toolCalls +
metadata for the seed, per-step and terminal writes)
- tests: deep-strip, same-reference, end-to-end via flushAssistant
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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