Delete row sig_273c45937fdd from signals

id sig_273c45937fdd
event_id evt_d1263a88763f
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_b8ff5a153 ...
dedupe_key signal_enriched:discovery_ipo_delta:7f4bc921777397 ...
throttle_s 0
created_at 2026-04-08T21:48:34.772061+00:00
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