Delete row sig_a27993be52d7 from signals

id sig_a27993be52d7
event_id evt_06730d20ab6c
watcher_id NULL
signal_type opportunity_artifact
value {"artifact_id":"artf_thesis_fd82430c12 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity
reason_trace {"_evidence_event_ids":["evt_1d7e8bb24 ...
dedupe_key opportunity_artifact:artf_thesis_fd82430c12d2f307
throttle_s 0
created_at 2026-04-17T03:41:54.580555+00:00
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