Delete row sig_972cc3edb930 from signals

id sig_972cc3edb930
event_id evt_acc57c100bc8
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T21:26:42.512486+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:53221959b6d9800a
throttle_s 0
created_at 2026-04-18T21:26:42.512486+00:00
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