Delete row sig_2a3687428151 from signals

id sig_2a3687428151
event_id evt_fe009251433d
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-09T20:38:36.835560+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:afdcddee403b2972
throttle_s 0
created_at 2026-04-09T20:38:36.835560+00:00
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