Delete row sig_abf48780a203 from signals

id sig_abf48780a203
event_id evt_82cfcbab3098
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_27de0cac9 ...
dedupe_key signal_enriched:discovery_ipo_delta:2bc245bfd3374c ...
throttle_s 0
created_at 2026-04-17T14:13:05.509159+00:00
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