Delete row sig_6604ef7e6eb9 from signals

id sig_6604ef7e6eb9
event_id evt_f8e7e07d90f6
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-13T13:09:51.933442+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:b72ce1798fa55f8c
throttle_s 0
created_at 2026-04-13T13:09:51.933442+00:00
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