Delete row sig_e6940816b117 from signals

id sig_e6940816b117
event_id evt_906eb4dcbb5b
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_11090bbf8 ...
dedupe_key signal_enriched:discovery_ipo_delta:78debb11e52135 ...
throttle_s 0
created_at 2026-04-21T13:49:56.265209+00:00
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