Delete row sig_d16e78e69a2f from signals

id sig_d16e78e69a2f
event_id evt_6dc313ea5c13
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-08T05:23:21.463047+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:41d18d13e7ed88ce
throttle_s 0
created_at 2026-04-08T05:23:21.463047+00:00
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