Delete row sig_8b2f5d916b7b from signals

id sig_8b2f5d916b7b
event_id evt_0d0913e9799f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T19:56:02.933268+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:2035e33871cde3bd
throttle_s 0
created_at 2026-04-18T19:56:02.933268+00:00
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