Delete row sig_806cd49dfa1c from signals

id sig_806cd49dfa1c
event_id evt_4acd1afc0572
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_3a98b59af ...
dedupe_key signal_enriched:discovery_ipo_delta:d241f65e45c5bf ...
throttle_s 0
created_at 2026-04-18T23:17:56.322952+00:00
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