Delete row sig_92fe1d8f1777 from signals

id sig_92fe1d8f1777
event_id evt_59444a69c8cf
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-08T08:21:13.525268+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:ce2e36a27c068445
throttle_s 0
created_at 2026-04-08T08:21:13.525268+00:00
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