Delete row sig_2451d6e92a93 from signals

id sig_2451d6e92a93
event_id evt_8592cc611e69
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-18T01:48:20.307157+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b4b4e3497255a639
throttle_s 0
created_at 2026-04-18T01:48:20.307157+00:00
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