Delete row sig_46b7d7ac739b from signals

id sig_46b7d7ac739b
event_id evt_71f6f46dc191
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_c3d8d104f ...
dedupe_key signal_enriched:discovery_ipo_delta:f3054b3e02f718 ...
throttle_s 0
created_at 2026-04-09T07:40:05.415195+00:00
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