Delete row sig_108f30538308 from signals

id sig_108f30538308
event_id evt_8d576c5de9e4
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_d56c4c3a8 ...
dedupe_key signal_enriched:discovery_ipo_delta:8b9461e4d610e3 ...
throttle_s 0
created_at 2026-04-08T06:31:07.641041+00:00
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