Delete row sig_1aa303a07301 from signals

id sig_1aa303a07301
event_id evt_8a315038316f
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_85fb457cc ...
dedupe_key signal_enriched:discovery_options_flow_delta:824f3 ...
throttle_s 0
created_at 2026-04-08T19:57:42.365437+00:00
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