Delete row sig_a4b77841aa29 from signals

id sig_a4b77841aa29
event_id evt_3a81258c1b24
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_2765cb475 ...
dedupe_key signal_enriched:discovery_ipo_delta:5436f3f90f5300 ...
throttle_s 0
created_at 2026-04-10T17:21:18.772571+00:00
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