Default codex_fingerprint_mode to off. v0.1.175 treated a missing key as
"session", so upgrading silently rewrote installation/session/thread/turn/
window identifiers for every existing OAuth account that had never configured
this field. The quota regressions in #5555, #5556 and #5582 line up with that
version boundary, with A/B reports that rolling back to v0.1.173 restores
quota. Convergence is now explicit opt-in (#5610).
Only accounts that never set the field change behaviour; explicit off /
device / session / full keep working exactly as configured. That required
flipping the persistence condition in all three account modals from
"!== 'session'" to "!== 'off'": the old rule deleted the key when it equalled
the default, which after the flip would have silently discarded an
administrator's explicit opt-in to session.
Also extend convergence to the passthrough path, which previously left client
identifiers untouched:
- resolve the ids once in forwardOpenAIPassthrough and rewrite
client_metadata on the raw bytes (gjson extract + sjson splice) because
passthrough is a hot path that must not fully unmarshal multi-MB bodies;
a shared core keeps the raw and map variants from drifting
- both request builders apply the staged ids at the same relative position
(after session isolation, before identity enforcement) so headers and body
share one id set and turn_id stays consistent
- stage the ids unconditionally, including nil: a failover from a converged
account to an off account must not leave the previous account's ids behind
shaw
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