Delete row sig_f15452ba3780 from signals

id sig_f15452ba3780
event_id evt_77d22c6c5218
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_f960c9da7 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:fe5b32f ...
throttle_s 0
created_at 2026-04-08T02:28:02.401723+00:00
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