Delete row sig_1033139a8495 from signals

id sig_1033139a8495
event_id evt_d0e6cec5441a
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_4e3f0edc3 ...
dedupe_key signal_enriched:discovery_ipo_delta:bf4c286f48769f ...
throttle_s 0
created_at 2026-04-12T12:46:13.193279+00:00
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