Delete row sig_389add04344e from signals

id sig_389add04344e
event_id evt_ef428622e37c
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T22:39:08.588914+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:73f7ae014b15f922
throttle_s 0
created_at 2026-04-11T22:39:08.588914+00:00
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