Delete row sig_1507ec193159 from signals

id sig_1507ec193159
event_id evt_5fa29f48cadc
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-11T02:38:38.680552+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:294024586ff3bccd
throttle_s 0
created_at 2026-04-11T02:38:38.680552+00:00
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