Delete row sig_da52807b036b from signals

id sig_da52807b036b
event_id evt_7879740d870e
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_c2c0a2d81 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:ce4f3da ...
throttle_s 0
created_at 2026-04-11T03:10:51.104915+00:00
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