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feat(usage): cache_read_tokens and cache_write_tokens on usage events - #21
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The input tokens read from and written to the vendor's prompt cache, part of tokens_input, so callers and reports can tell cached input from plain input that vendors bill at a different rate. Stored in Postgres and ClickHouse and summed in summary and by-meta rows.
…ClickHouse and HTTP Events without cache tokens validate exactly as before, and the bound check cannot overflow. Tests cover cache_write_tokens through the replicator and both ClickHouse reads, and the HTTP mapping. The README says how to report Anthropic usage, whose input_tokens excludes cached input.
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Part of ai-process/docs#78 (prompt-cache costs in KTMS).
usage.v1:UsageEvent.cache_read_tokens = 17,cache_write_tokens = 18; summed inUsageSummaryRow(16, 17) andUsageByMetaRow(9, 10). Additive;buf breakingpasses.tokens_input; an event is refused if either is negative or together they exceed it.KTMS fills them after this lands (its CI checks
usage.protoagainst this repo's main).