Delete row sig_1973918f9bb0 from signals

id sig_1973918f9bb0
event_id evt_3d05a89b43e3
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_b3f1e011e ...
dedupe_key signal_enriched:discovery_ipo_delta:91b3359cf058d6 ...
throttle_s 0
created_at 2026-04-21T16:48:38.963204+00:00
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