Delete row sig_d9f848a694a0 from signals

id sig_d9f848a694a0
event_id evt_e31b7d97557a
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_3a0915e6d ...
dedupe_key signal_enriched:discovery_ipo_delta:246ae5c4b22a2b ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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