Delete row sig_4dcfba410d4f from signals

id sig_4dcfba410d4f
event_id evt_a3013b4c0676
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_2cf9c55bd ...
dedupe_key signal_enriched:discovery_ipo_delta:aa15352e418378 ...
throttle_s 0
created_at 2026-04-19T08:16:46.541573+00:00
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