Delete row sig_815437827ce4 from signals

id sig_815437827ce4
event_id evt_b72dafae33a6
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-08T01:00:35.899134+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:1c05ced00df306c0
throttle_s 0
created_at 2026-04-08T01:00:35.899134+00:00
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