Delete row sig_78b5be755098 from signals

id sig_78b5be755098
event_id evt_bf2a28ebba17
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_b7a1a0fa2 ...
dedupe_key signal_enriched:discovery_ipo_delta:580b7e3a2b4dab ...
throttle_s 0
created_at 2026-04-20T05:04:04.603819+00:00
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