Delete row sig_4abe45fbcf5f from signals

id sig_4abe45fbcf5f
event_id evt_cf5e1c9440bb
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T13:08:37.922387+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:7a05fa5ec407ed00
throttle_s 0
created_at 2026-04-20T13:08:37.922387+00:00
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