Delete row sig_a3a422acc96f from signals

id sig_a3a422acc96f
event_id evt_0c0d27eaec38
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_297edaa2b ...
dedupe_key signal_enriched:discovery_sec_filing_delta:f292ecc ...
throttle_s 0
created_at 2026-04-21T03:09:54.871544+00:00
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