Harwinder Sekhon 7a810c4a4c Remove Tiingo spread monitor (indicative two-tier feed, unvalidatable)
Tiingo's free /tiingo/fx/top publishes only a two-tier indicative
spread for gold ($0.10 liquid hours / $0.70 rollover+news; verified on
273 production samples + live probes) — mid ± a posted increment, not
executable depth, so it can never validate the $0.30 backtest cost
assumption. Removed one day after shipping: tiingo_provider.py, the
sampler/quote plumbing in telegram_bot.py, the channel_spread_detail
config knob and tiingo_api_key resolver, and Module 14's Tiingo tests
(221 -> 210). CLAUDE.md documents the verdict: do not re-add a spread
display from Tiingo's free FX feed.

Claude-Session: https://claude.ai/code/session_01BoZKi67Ct6QTeiFJmybXSw
2026-07-24 10:56:55 -04:00
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