Delete row sig_282ff84830ae from signals

id sig_282ff84830ae
event_id evt_499087051c3b
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-07T05:08:51.438771+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:998588bb93513e61
throttle_s 0
created_at 2026-04-07T05:08:51.438771+00:00
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