Delete row sig_e90c9af75440 from signals

id sig_e90c9af75440
event_id evt_4da97a3342d8
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-22T11:15:02.489830+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:35efa9124ecb7dc8
throttle_s 0
created_at 2026-04-22T11:15:02.489830+00:00
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