Delete row sig_6785fef196be from signals

id sig_6785fef196be
event_id evt_da1bc3542a24
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_fd4299d5f ...
dedupe_key signal_enriched:discovery_ipo_delta:77a14eec9a3c3a ...
throttle_s 0
created_at 2026-04-11T07:38:53.958029+00:00
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