Delete row sig_858900c6ebfa from signals

id sig_858900c6ebfa
event_id evt_dd985bca27c3
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T05:14:23.341492+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:dcc503992b1d5b92
throttle_s 0
created_at 2026-04-21T05:14:23.341492+00:00
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