Delete row sig_301be1b355ad from signals

id sig_301be1b355ad
event_id evt_2144ba2f698b
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_80b34f2f4 ...
dedupe_key signal_enriched:discovery_ipo_delta:ef864062e74019 ...
throttle_s 0
created_at 2026-04-20T08:07:12.530016+00:00
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