Delete row sig_8ac150fc981f from signals

id sig_8ac150fc981f
event_id evt_0272cb85475f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T09:09:48.519384+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:1f6cd78f6b7133db
throttle_s 0
created_at 2026-04-13T09:09:48.519384+00:00
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