Delete row sig_52904385320a from signals

id sig_52904385320a
event_id evt_cd559415c5bf
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_3fb29e9f8 ...
dedupe_key signal_enriched:discovery_options_flow_delta:25963 ...
throttle_s 0
created_at 2026-04-21T10:45:03.231354+00:00
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