Delete row sig_ef990b8e8b5a from signals

id sig_ef990b8e8b5a
event_id evt_76a0d4272db2
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-16T08:11:06.207890+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:111a1faef4aef86a
throttle_s 0
created_at 2026-04-16T08:11:06.207890+00:00
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