- add byAgentModel endpoint and expandable per-agent model sub-rows in the spend tab
- validate date range inputs with isNaN + badRequest to return HTTP 400 on bad input
- move CostByProject from a local api/costs.ts definition into packages/shared types
- gate providerData query on mainTab === providers, consistent with weekData/windowData/quotaData
- fix byProject range filter from finishedAt to startedAt, consistent with byProvider runs query
- fix WHAM used_percent threshold from <= 1 to < 1 to avoid misclassifying 1% usage as 100%
- replace inline opacity style with tailwind bg-primary/85 class in ProviderQuotaCard
- reset expandedAgents set when company or date range changes
- sort agent model sub-rows by cost descending in ui memo
- add company existence check on quota-windows route to guard against
sentinel and forged company IDs (was a no-op assertCompanyAccess)
- fix useDateRange minuteTick memo frozen at mount; realign interval to
next calendar minute boundary via setTimeout + intervalRef pattern
- fix midnight timer in Costs.tsx to use stable [] dep and
self-scheduling todayTimerRef to avoid StrictMode double-invoke
- return null for rolling window rows with no DB data instead of
rendering $0.00 / 0 tok false zeros
- fix secondsToWindowLabel to handle windows >168h with actual day count
instead of silently falling back to 7d
- fix byProvider.get(p) non-null assertion to use ?? [] fallback
merge Usage page into Costs as two tabs ('Spend' and 'Providers'),
extract shared date-range logic to useDateRange() hook, delete /usage
route and sidebar entry, fix quota-windows bugs from prior review
reads local claude and codex auth files server-side, calls provider
quota apis (anthropic oauth usage, chatgpt wham/usage), and surfaces
live usedPercent per window in ProviderQuotaCard with threshold fill colors
