Delete row sig_476b3d84027c from signals

id sig_476b3d84027c
event_id evt_5d70b621131c
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T11:03:02.381811+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:3de11875c12c7ec4
throttle_s 0
created_at 2026-04-18T11:03:02.381811+00:00
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