Delete row sig_69108d6b4a1d from signals

id sig_69108d6b4a1d
event_id evt_66097b089170
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_44748b3e40 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_21021faa3 ...
dedupe_key opportunity_artifact:artf_thesis_44748b3e40f39ecc
throttle_s 0
created_at 2026-04-22T13:24:49.273095+00:00
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