Delete row sig_2f14888bc15a from signals

id sig_2f14888bc15a
event_id evt_09ac62ebccb7
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_d04d6f0c5 ...
dedupe_key signal_enriched:discovery_ipo_delta:7bc5775ff1daa9 ...
throttle_s 0
created_at 2026-04-17T16:32:24.724517+00:00
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