Delete row sig_8b4528152148 from signals

id sig_8b4528152148
event_id evt_11f1c3407a45
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_4e492a61e ...
dedupe_key signal_enriched:discovery_sec_filing_delta:ae68bbd ...
throttle_s 0
created_at 2026-04-11T03:10:51.104915+00:00
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