Delete row sig_815bd5c52746 from signals

id sig_815bd5c52746
event_id evt_1637e092ba01
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-10T04:04:02.423543+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:6f081e5572c4cc3a
throttle_s 0
created_at 2026-04-10T04:04:02.423543+00:00
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