Delete row sig_319993df97d1 from signals

id sig_319993df97d1
event_id evt_c1fa51709e30
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_9c674bafb ...
dedupe_key signal_enriched:discovery_ipo_delta:00ef872e5915fa ...
throttle_s 0
created_at 2026-04-09T15:06:58.940339+00:00
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