[Bug]: Usage prices Claude 1-hour cache writes at the 5-minute rate #21010

Before submitting

• I searched existing issues and did not find a duplicate.
• I included enough detail to reproduce or investigate the problem.

Area

apps/server

Summary

Usage prices every Claude cache write at cache_creation_input_token_cost (the 5-minute rate). Claude Code also writes 1-hour cache entries, which bill at a higher rate, so Claude cost is understated.

Steps to reproduce

1. Use Claude Code long enough to produce transcript records whose message.usage.cache_creation.ephemeral_1h_input_tokens is greater than 0.
2. Compare the cost Usage shows with tokens x rate: the 1-hour tokens are charged at the 5-minute rate.

Expected behavior

Tokens in usage.cache_creation.ephemeral_1h_input_tokens are priced with cache_creation_input_token_cost_above_1hr from the pricing data; the rest of cache_creation_input_tokens stays at cache_creation_input_token_cost. For example the LiteLLM entry anthropic.claude-opus-4-5-20251101-v1:0 has 6.25e-06 for the 5-minute write and 1e-05 for the 1-hour write (1.6x).

Actual behavior

• parseClaudeRecord in apps/server/src/provider/Drivers/claudeUsage.ts reads only cache_creation_input_tokens, so the 5-minute and 1-hour split is dropped.
• readTokenRates in apps/server/src/usage/usagePricing.ts (the cacheRate("cache_creation_input_token_cost", ...) call, near line 76) reads one write rate and never cache_creation_input_token_cost_above_1hr.

Measured over 30 days on one machine (Claude Code transcripts): 290M tokens were 1-hour writes, which is about $870 of cost not counted. Together with the output-token undercount in #20246, Claude cost shows about 13% low here. Total tokens are not affected.

Suggested fix

Carry the 1-hour write count through UsageRecord totals next to cacheCreationTokens, and in the cost step price it at cache_creation_input_token_cost_above_1hr when the entry has it (fall back to the 5-minute rate when it does not, as cacheRate already does for missing fields). Records with no cache_creation breakdown keep today's behaviour.

Impact

Minor bug or occasional failure

Version or commit

Desktop app 0.1.0 (Beta build), checked against main @ 13aa882

Environment

macOS, Claude Code transcripts from the 2.1.x series