Delete row sig_88ca5b619676 from signals

id sig_88ca5b619676
event_id evt_7d8d9d282f26
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_9a6ff8a50 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:292a0bf ...
throttle_s 0
created_at 2026-04-03T11:12:58.166696+00:00
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