Delete row sig_1d85b77aa8f8 from signals

id sig_1d85b77aa8f8
event_id evt_0120b571e457
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_01e12285a ...
dedupe_key signal_enriched:discovery_new_listings_delta:d96e4 ...
throttle_s 0
created_at 2026-04-21T19:57:20.275338+00:00
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