Delete row sig_1a70b17f9827 from signals

id sig_1a70b17f9827
event_id evt_fcf9af73c410
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_14276b905 ...
dedupe_key signal_enriched:discovery_ipo_delta:0ffeedc3847cf7 ...
throttle_s 0
created_at 2026-04-10T21:13:12.521723+00:00
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