Delete row sig_efd1ca2f0ed7 from signals

id sig_efd1ca2f0ed7
event_id evt_a248fd5fe3bc
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_c7e14c07f ...
dedupe_key signal_enriched:discovery_ipo_delta:1fcd724f7ecde7 ...
throttle_s 0
created_at 2026-04-07T23:23:54.391414+00:00
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