Delete row sig_19700cd60736 from signals

id sig_19700cd60736
event_id evt_0bfde608d213
watcher_id NULL
signal_type discovery_options_flow_delta
value {"aggregator_url":"https://www.nasdaq. ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_46cadae84 ...
dedupe_key signal_enriched:discovery_options_flow_delta:48766 ...
throttle_s 0
created_at 2026-04-21T15:19:25.858681+00:00
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