Delete row sig_9a1c27ae3f40 from signals

id sig_9a1c27ae3f40
event_id evt_e294141f16e0
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_5eb6892d3 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:d426cc2 ...
throttle_s 0
created_at 2026-04-16T02:08:52.472606+00:00
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