Delete row sig_15261d3f4ccc from signals

id sig_15261d3f4ccc
event_id evt_2e6c8b3e3c0d
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_282449df7 ...
dedupe_key signal_enriched:discovery_ipo_delta:5e11524c146fd4 ...
throttle_s 0
created_at 2026-04-10T15:51:15.884890+00:00
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