Delete row sig_35a7f7c3b192 from signals

id sig_35a7f7c3b192
event_id evt_e71a6686a60b
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_7f4a9236b ...
dedupe_key signal_enriched:discovery_ipo_delta:9f231b206e87d4 ...
throttle_s 0
created_at 2026-04-20T14:11:25.277652+00:00
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