Delete row sig_4d5cc7629cbd from signals

id sig_4d5cc7629cbd
event_id evt_c775bbdaabe7
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_9bd41e12c ...
dedupe_key signal_enriched:discovery_options_flow_delta:06865 ...
throttle_s 0
created_at 2026-04-20T18:44:57.233742+00:00
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