Delete row sig_f0086e240d7d from signals

id sig_f0086e240d7d
event_id evt_63d328cc7c02
watcher_id NULL
signal_type market_headlines_snapshot
value {"as_of":"2026-04-21T01:31:07.989852+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source market_ingestor
reason_trace {}
dedupe_key market_headlines_snapshot:90c0b27909c61485
throttle_s 0
created_at 2026-04-21T01:31:07.989852+00:00
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