Delete row sig_1b6c88292436 from signals

id sig_1b6c88292436
event_id evt_5a31dce41ace
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_0a89d9aca ...
dedupe_key signal_enriched:discovery_ipo_delta:49766202c88968 ...
throttle_s 0
created_at 2026-04-21T09:16:05.409385+00:00
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