Delete row sig_14e19e2eb657 from signals

id sig_14e19e2eb657
event_id evt_0080fc109fc7
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_45c438601 ...
dedupe_key signal_enriched:discovery_ipo_delta:5a51c886306031 ...
throttle_s 0
created_at 2026-04-17T08:15:09.531669+00:00
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