Delete row sig_0b394941989c from signals

id sig_0b394941989c
event_id evt_90131c2e9a92
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T00:25:50.754449+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:d5fa3d984f711a87
throttle_s 0
created_at 2026-04-19T00:25:50.754449+00:00
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