Delete row sig_87833c892a6a from signals

id sig_87833c892a6a
event_id evt_412a02181c62
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-14T18:10:20.939357+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:66777dab88035d54
throttle_s 0
created_at 2026-04-14T18:10:20.939357+00:00
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