Delete row sig_21bcfc5a7b43 from signals

id sig_21bcfc5a7b43
event_id evt_6e99dfcbfbca
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-09T00:07:57.734810+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:102a67b79967768b
throttle_s 0
created_at 2026-04-09T00:07:57.734810+00:00
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