Delete row sig_8cb230140ef1 from signals

id sig_8cb230140ef1
event_id evt_af52069aed5e
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T23:28:52.615759+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:0fe8790675b0f693
throttle_s 0
created_at 2026-04-08T23:28:52.615759+00:00
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