Delete row sig_f61224531303 from signals

id sig_f61224531303
event_id evt_6d74ff514d07
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-12T04:13:14.693307+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:a348b028050cc5ed
throttle_s 0
created_at 2026-04-12T04:13:14.693307+00:00
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