Delete row sig_ec3429522cb7 from signals

id sig_ec3429522cb7
event_id evt_5a0149eafe89
watcher_id NULL
signal_type discovery_ipo_delta
value {"aggregator_url":"https://news.google ...
threshold NULL
direction NULL
severity NULL
window NULL
source discovery_ingestor
reason_trace {"_evidence_event_ids":["evt_cc8d2cca8 ...
dedupe_key signal_enriched:discovery_ipo_delta:d51ef3411522a6 ...
throttle_s 0
created_at 2026-04-10T09:08:57.869901+00:00
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