Delete row sig_41f51370a54f from signals

id sig_41f51370a54f
event_id evt_7985dc4870ad
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T01:55:12.230512+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:15cf6d3d5fc593cc
throttle_s 0
created_at 2026-04-19T01:55:12.230512+00:00
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