Delete row sig_3bc9428a563a from signals

id sig_3bc9428a563a
event_id evt_107699f62afd
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-21T08:53:56.520598+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:fa4c9c33c478f47b
throttle_s 0
created_at 2026-04-21T08:53:56.520598+00:00
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