Delete row sig_218aadd83a87 from signals

id sig_218aadd83a87
event_id evt_c77155692665
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_1333a0720 ...
dedupe_key signal_enriched:discovery_ipo_delta:f345577e07098e ...
throttle_s 0
created_at 2026-04-14T10:11:17.846354+00:00
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