Delete row sig_c15703f487b4 from signals

id sig_c15703f487b4
event_id evt_4a106dd7de3d
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_c6c67feea ...
dedupe_key signal_enriched:discovery_sec_filing_delta:2d50563 ...
throttle_s 0
created_at 2026-04-11T03:10:51.104915+00:00
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