Delete row sig_600d8037940f from signals

id sig_600d8037940f
event_id evt_39181dcb6500
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_4746cff66 ...
dedupe_key signal_enriched:discovery_ipo_delta:23fcd4fec44ee3 ...
throttle_s 0
created_at 2026-04-22T04:05:03.223061+00:00
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