Delete row sig_b440e589b269 from signals

id sig_b440e589b269
event_id evt_12634ebb3b75
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_8ee815e92 ...
dedupe_key signal_enriched:discovery_options_flow_delta:de8b2 ...
throttle_s 0
created_at 2026-04-08T22:43:46.053448+00:00
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