Delete row sig_1faadb88236c from signals

id sig_1faadb88236c
event_id evt_31244aceedab
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T19:56:02.933268+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:d8ec2c438974ad1d
throttle_s 0
created_at 2026-04-18T19:56:02.933268+00:00
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