Delete row sig_f2dca1d39448 from signals

id sig_f2dca1d39448
event_id evt_11ff66e0cc6c
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_83ae44497b ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_50d2bd0b8 ...
dedupe_key opportunity_artifact:artf_thesis_83ae44497bb9815f
throttle_s 0
created_at 2026-04-22T13:19:46.639406+00:00
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