Delete row sig_844148a6e502 from signals

id sig_844148a6e502
event_id evt_675f2307d12f
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-17T16:11:36.658714+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:6dcb3ce8783d2f8d
throttle_s 0
created_at 2026-04-17T16:11:36.658714+00:00
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