Delete row sig_d28ccbf71279 from signals

id sig_d28ccbf71279
event_id evt_7770f121a056
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_569db4ec3 ...
dedupe_key signal_enriched:discovery_sec_filing_delta:b5d0cc3 ...
throttle_s 0
created_at 2026-04-18T03:05:05.644967+00:00
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