Delete row sig_3a646c3e1c94 from signals

id sig_3a646c3e1c94
event_id evt_df85cb487743
watcher_id NULL
signal_type discovery_new_listings_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_477a50c5d ...
dedupe_key signal_enriched:discovery_new_listings_delta:49d4e ...
throttle_s 0
created_at 2026-04-22T08:07:13.237740+00:00
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