Delete row sig_ecb9ac30bcf3 from signals

id sig_ecb9ac30bcf3
event_id evt_880eaa0c2901
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_6108570da ...
dedupe_key signal_enriched:discovery_ipo_delta:1332c70d49ce08 ...
throttle_s 0
created_at 2026-04-16T10:15:40.769768+00:00
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