Delete row sig_f819b2aea307 from signals

id sig_f819b2aea307
event_id evt_551569a0a1f1
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T07:17:43.935401+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:ae412a9cb645e36b
throttle_s 0
created_at 2026-04-11T07:17:43.935401+00:00
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