Delete row sig_45f3904b327a from signals

id sig_45f3904b327a
event_id evt_ac20eaa22070
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T10:40:21.930257+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:39b19bb943e2261a
throttle_s 0
created_at 2026-04-21T10:40:21.930257+00:00
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