Delete row sig_4aa8606de30d from signals

id sig_4aa8606de30d
event_id evt_389d1820dc8f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T23:12:46.393556+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:8a79f391cfe07389
throttle_s 0
created_at 2026-04-18T23:12:46.393556+00:00
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