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Brisbanehuang
b0f5007f04
Successful upstream billing probes already persist the upstream-declared rate as a display-only snapshot. Add a per-account opt-in that writes that declared rate back to the account's rate_multiplier, so the account cost basis follows upstream repricing automatically instead of drifting until an operator notices. - new per-account flag upstream_billing_rate_sync_enabled stored next to the probe flag in account extra: enabling sync force-enables the probe, disabling the probe cascades sync off, and eligibility follows IsUpstreamBillingProbeIdentity (tightened from any non-empty platform to an explicit whitelist of the five supported API-key platforms so future platforms do not silently inherit probe/sync semantics) - only a successful probe whose declared rate survives validation (finite, within bounds, not rounded to zero at the rate_multiplier decimal(10,4) scale) writes back; failed/unsupported/invalid probes leave rate_multiplier unchanged - the writeback rides the existing snapshot CAS transaction: UpdateUpstreamBillingProbeSnapshot takes an optional rateMultiplier and applies it atomically with the snapshot under the same identity/snapshot compare-and-swap, so a probe result observed on a stale account cannot clobber a concurrent admin edit - admin edit goes through UpdateWithAccountBillingSettings, which applies the form without overwriting a rate that a probe synchronized after the edit form was loaded (nil rateMultiplier = not edited); once sync is enabled the edit form shows the rate as managed - bulk update rejects a manual rate_multiplier change when any target account has rate sync enabled (whole batch fails with a dedicated error so partial writes cannot bypass the sync ownership) - frontend: sync toggle with hints in the edit modal (probe/sync enable/disable coupling enforced in the form), synced-rate tooltip on the rate cell, bulk edit modal warns and blocks rate edits that hit sync-enabled accounts; en/zh copy updated - tests: service unit tests for sync gating/validation/cascade, sqlmock repo tests for the extended CAS, real-PostgreSQL integration tests (rate written only for successful+enabled accounts, manual rate protected after sync disabled, admin edit preserved across concurrent probe sync), handler/API contract updates, frontend specs for modal coupling, bulk rejection and rate cell