Delete row sig_500b74c1be74 from signals

id sig_500b74c1be74
event_id evt_1296158f7122
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T15:13:06.958138+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:b863be84d7d5cf77
throttle_s 0
created_at 2026-04-19T15:13:06.958138+00:00
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