Delete row sig_e34e0c9622b2 from signals

id sig_e34e0c9622b2
event_id evt_b371a177a5ce
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_8294c1446 ...
dedupe_key signal_enriched:discovery_ipo_delta:deb280e43150ae ...
throttle_s 0
created_at 2026-04-20T15:42:12.815098+00:00
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