Delete row sig_1e620acac9eb from signals

id sig_1e620acac9eb
event_id evt_f198cc0bcbaf
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_8f0ce43eb ...
dedupe_key signal_enriched:discovery_ipo_delta:babe45a84d82e7 ...
throttle_s 0
created_at 2026-04-17T15:43:22.010403+00:00
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