Delete row sig_ab97f5f37c3c from signals

id sig_ab97f5f37c3c
event_id evt_8c396a743dae
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T06:22:29.746336+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:497880f7ecaa8b51
throttle_s 0
created_at 2026-04-20T06:22:29.746336+00:00
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