Delete row sig_850c9b763038 from signals

id sig_850c9b763038
event_id evt_b08262c1e4bf
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-09T10:17:30.381419+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:7fc0e5c42fb83157
throttle_s 0
created_at 2026-04-09T10:17:30.381419+00:00
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