Delete row sig_d739281ec849 from signals

id sig_d739281ec849
event_id evt_ab146ebdeb9a
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T13:04:47.107913+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:75766bf0727ce416
throttle_s 0
created_at 2026-04-21T13:04:47.107913+00:00
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