Delete row sig_f513e8a5bce8 from signals

id sig_f513e8a5bce8
event_id evt_f138c03fffe3
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-18T12:12:36.301126+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:3791f4fb275b1ff7
throttle_s 0
created_at 2026-04-18T12:12:36.301126+00:00
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