Delete row sig_01b1b3dd845c from signals

id sig_01b1b3dd845c
event_id evt_c2955e0eb5e6
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_1ec82567e ...
dedupe_key signal_enriched:discovery_ipo_delta:32e367a95135ad ...
throttle_s 0
created_at 2026-04-09T12:08:05.625638+00:00
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