Delete row sig_651c82b651eb from signals

id sig_651c82b651eb
event_id evt_861d0f2bccfd
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-11T21:03:01.896424+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:c8579a63a7c33c61
throttle_s 0
created_at 2026-04-11T21:03:01.896424+00:00
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