Delete row sig_409e2db37a5f from signals

id sig_409e2db37a5f
event_id evt_50a86f641f2b
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T05:14:48.024784+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:ad960ada04e5fa1c
throttle_s 0
created_at 2026-04-22T05:14:48.024784+00:00
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