Delete row sig_81f928ded8bd from signals

id sig_81f928ded8bd
event_id evt_96c2e62977f1
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_8928a5d31 ...
dedupe_key signal_enriched:discovery_options_flow_delta:77981 ...
throttle_s 0
created_at 2026-04-06T17:13:11.811157+00:00
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