Delete row sig_df5c5ca11b8b from signals

id sig_df5c5ca11b8b
event_id evt_b78d9b6787a6
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_b233468d2 ...
dedupe_key signal_enriched:discovery_new_listings_delta:8f60a ...
throttle_s 0
created_at 2026-04-20T20:32:04.855080+00:00
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