Delete row sig_1e632224a537 from signals

id sig_1e632224a537
event_id evt_ecd98cd678ad
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T07:54:15.545991+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:71ee8a5629c02fdf
throttle_s 0
created_at 2026-04-19T07:54:15.545991+00:00
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