Delete row sig_c93b1a29f046 from signals

id sig_c93b1a29f046
event_id evt_4446bbbf0926
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_21b7be5b3c ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_a7efc1c81 ...
dedupe_key opportunity_artifact:artf_thesis_21b7be5b3c32997e
throttle_s 0
created_at 2026-04-17T06:42:17.191097+00:00
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