Delete row sig_440d3a822d3a from signals

id sig_440d3a822d3a
event_id evt_b3cbde0da971
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_bf76dd57b ...
dedupe_key signal_enriched:discovery_options_flow_delta:0f31c ...
throttle_s 0
created_at 2026-04-07T18:51:45.491133+00:00
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