Delete row sig_1a227279b845 from signals

id sig_1a227279b845
event_id evt_450dd84ff3e9
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-12T11:02:50.567122+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:a9a229e4ba1015fe
throttle_s 0
created_at 2026-04-12T11:02:50.567122+00:00
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