Delete row sig_1574b0eced49 from signals

id sig_1574b0eced49
event_id evt_fff816494ca8
watcher_id NULL
signal_type discovery_sec_filing_delta
value {"aggregator_url":"https://www.sec.gov ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_sec_filings
reason_trace {"_evidence_event_ids":["evt_01d34f4b3 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:f27ff49 ...
throttle_s 0
created_at 2026-04-09T03:12:49.786272+00:00
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