Delete row sig_4572b600691e from signals

id sig_4572b600691e
event_id evt_2a1cb31d1a2e
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_df65a1232 ...
dedupe_key signal_enriched:discovery_options_flow_delta:0956c ...
throttle_s 0
created_at 2026-04-17T18:02:19.234747+00:00
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