Delete row sig_3033f50b1be4 from signals

id sig_3033f50b1be4
event_id evt_9fa76cfd3db6
watcher_id NULL
signal_type market_prices_snapshot
value {"as_of":"2026-04-11T16:17:22.391444+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_prices_snapshot:b49a1813b04662d5
throttle_s 0
created_at 2026-04-11T16:17:22.391444+00:00
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