Delete row sig_19c9041ca5ac from signals

id sig_19c9041ca5ac
event_id evt_6b6a7114e66a
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T17:57:08.457469+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:c76a6d1004a54ec0
throttle_s 0
created_at 2026-04-21T17:57:08.457469+00:00
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