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Renn F
af6cad98d8
Confirmed by inspecting a local opencode run: opencode persists per-session usage in SQLite at ~/.local/share/opencode/opencode.db — the `session` table carries cost + tokens_input/output/reasoning/cache_read/cache_write. xAI's response usage object (prompt_tokens, completion_tokens, prompt_tokens_details.cached_tokens, completion_tokens_details.reasoning_tokens) maps directly onto those columns. Add opencode_usage.read_session_usage / cost_for_session: read the opencode DB and price the tokens via roboco.billing.pricing (our cost stays authoritative; opencode's own `cost` column is kept for reference). Tested against a fixture DB mirroring the real schema (single session, summed sessions, missing/empty DB). Remaining wiring (for the live spawn): mount the opencode data dir on grok spawn + call cost_for_session at reap to record the usage rollup.