Delete row sig_54703ed7bdf7 from signals

id sig_54703ed7bdf7
event_id evt_f0813ca7124e
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_edb1198c0 ...
dedupe_key signal_enriched:discovery_ipo_delta:01b82d1b4b415d ...
throttle_s 0
created_at 2026-04-22T13:12:40.941923+00:00
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