Delete row sig_680b90067833 from signals

id sig_680b90067833
event_id evt_16317226a26b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T16:55:05.592467+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:df326245da8cd951
throttle_s 0
created_at 2026-04-19T16:55:05.592467+00:00
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