Delete row sig_143a72594154 from signals

id sig_143a72594154
event_id evt_4a75b019796c
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T05:18:26.344707+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:2a7c5ebf856249a8
throttle_s 0
created_at 2026-04-22T05:18:26.344707+00:00
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