Delete row sig_f78116f7662d from signals

id sig_f78116f7662d
event_id evt_8bfc9c7ba15b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T00:07:47.231236+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:ca476308f685bb67
throttle_s 0
created_at 2026-04-10T00:07:47.231236+00:00
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