Delete row sig_8adda500797f from signals

id sig_8adda500797f
event_id evt_463b49299d40
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T21:56:31.193650+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:815f874d8a39fc09
throttle_s 0
created_at 2026-04-12T21:56:31.193650+00:00
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