Delete row sig_8d55637f620e from signals

id sig_8d55637f620e
event_id evt_7660c3cfed83
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T04:09:08.768141+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:fda2c2657ff6b727
throttle_s 0
created_at 2026-04-12T04:09:08.768141+00:00
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