Delete row sig_18faf8c4bd0d from signals

id sig_18faf8c4bd0d
event_id evt_8d1cf206242b
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_065d9c609 ...
dedupe_key signal_enriched:discovery_ipo_delta:0614e7addb2b05 ...
throttle_s 0
created_at 2026-04-20T13:10:00.946643+00:00
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