Delete row sig_621f8f254f9c from signals

id sig_621f8f254f9c
event_id evt_d866bdf194fe
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-10T04:18:48.519948+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:b66c1244395b07c1
throttle_s 0
created_at 2026-04-10T04:18:48.519948+00:00
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