Composite model routes support a match_type: prefix mode with an optional
upstream_model. Leaving upstream_model empty is meant to pass the concrete
requested model through to the upstream, but every request matching the prefix
collapsed to the route's public_model instead. A route with
public_model=deepseek-v4, match_type=prefix and an empty upstream_model
forwarded both deepseek-v4-flash and deepseek-v4-pro upstream as deepseek-v4.
Root cause: normalizeCompositeRouteInput backfilled an empty upstream_model with
public_model at save time, so CompositeRouteResolver.Resolve never reached its
"upstreamModel == '' -> concrete requested model" fallback.
- Skip the backfill for prefix routes only; an empty upstream_model stays empty
and Resolve passes the concrete requested model through.
- exact routes keep the backfill (model == public_model, so persisted/display
contract is unchanged).
- Explicit upstream_model still forwards that fixed model in every mode.
- Frontend: add an upstream_model hint (zh/en) documenting empty = passthrough.
formatMultiplier rounded any value >= 0.01 with toFixed(2), so a
configured multiplier like 0.035 displayed as 0.04x in the /usage and
/admin/usage cost tooltips. Format with up to 4 decimals and trim
trailing zeros while keeping at least 2 decimals; display-only fix,
billing amounts were already computed from the true multiplier.
Persist reasoning ceilings and exact mappings for OpenAI groups, enforce them across HTTP and WebSocket forwarding, and invalidate cached auth snapshots.
Debounced requests can finish out of order, allowing an earlier response to replace newer results or repopulate a cleared field. Track a request generation and gate state updates, with deterministic regression coverage.
Constraint: Preserve the existing 300 ms debounce and admin usage API contract
Rejected: Add AbortController plumbing | sequence invalidation matches repository patterns without changing API signatures
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep async filter results gated against superseded queries
Tested: Focused Vitest (4 tests), vue-tsc, ESLint, and full frontend suite except two pre-existing rollback assertion failures
Not-tested: Live browser against production-sized user data
Related: https://github.com/Wei-Shaw/sub2api/issues/4551
Resolve const-block conflict in openai_gateway_grok_cache.go:
keep #4590's client tool cache constants, drop grokFreeRolling24hTokenLimit
(moved to pkg/xai as IsGrokFreeRolling24hTokenLimit with legacy 2M support).
Subscription plans can carry a display-only ISO currency code, but the admin plan table and user plan cards still used a hard-coded dollar sign. Resolve the symbol through the shared currency helper while retaining existing number formatting, the currency code label, and legacy blank-currency behavior.
Constraint: Plans without a currency must keep the legacy USD display
Rejected: Reformat complete prices with Intl.NumberFormat | it would change existing decimals and remove the explicit currency code
Confidence: high
Scope-risk: narrow
Reversibility: clean
Directive: Keep plan currency symbols aligned across admin and user displays
Tested: targeted Vitest 4 tests; targeted ESLint; vue-tsc; Vite production build; full Vitest 1222 tests passed
Not-tested: Full Vitest has 2 unrelated upstream failures in admin.system.rollback.spec.ts
Related: https://github.com/Wei-Shaw/sub2api/issues/4609
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