Delete row sig_929a15938dc8 from signals

id sig_929a15938dc8
event_id evt_28421739c712
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_a565ac4d7 ...
dedupe_key signal_enriched:discovery_ipo_delta:a912c6b41d2ef5 ...
throttle_s 0
created_at 2026-04-16T08:14:25.857765+00:00
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