Delete row sig_0459f580535d from signals

id sig_0459f580535d
event_id evt_ec802fcdbe3c
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T23:08:35.902780+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:b238ab8ceac93170
throttle_s 0
created_at 2026-04-10T23:08:35.902780+00:00
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