Delete row sig_0144be9b6996 from signals

id sig_0144be9b6996
event_id evt_b29c7c98efce
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_46c475e2d ...
dedupe_key signal_enriched:discovery_sec_filing_delta:e4749f7 ...
throttle_s 0
created_at 2026-04-15T02:18:53.247056+00:00
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