Delete row sig_3b857e5638c7 from signals

id sig_3b857e5638c7
event_id evt_8ff17c7e2686
watcher_id NULL
signal_type discovery_options_flow_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_3a5e5c39b ...
dedupe_key signal_enriched:discovery_options_flow_delta:aaf66 ...
throttle_s 0
created_at 2026-04-12T13:46:53.258496+00:00
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