Delete row sig_13156f83f888 from signals

id sig_13156f83f888
event_id evt_95fdb7aa8ee4
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_e07404e7b ...
dedupe_key signal_enriched:discovery_ipo_delta:ea92209a204a52 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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