Delete row sig_fde468c58152 from signals

id sig_fde468c58152
event_id evt_854392787b5b
watcher_id NULL
signal_type opportunity_research_delta
value {"aggregator_url":"http://www.alcircle ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {"_evidence_event_ids":["evt_46eeab722 ...
dedupe_key signal_enriched:opportunity_research_delta:7233194 ...
throttle_s 0
created_at 2026-04-04T05:53:11.784212+00:00
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