Delete row sig_c400e53ccbab from signals

id sig_c400e53ccbab
event_id evt_32a5c017fd5d
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_3170cc375 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:346c5fe ...
throttle_s 0
created_at 2026-04-08T02:28:02.401723+00:00
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