Delete row sig_15204476853d from signals

id sig_15204476853d
event_id evt_a1695b9ebc2e
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_e3feed901 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:0b70b21 ...
throttle_s 0
created_at 2026-04-21T03:09:54.871544+00:00
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