Delete row sig_1b42017325f3 from signals

id sig_1b42017325f3
event_id evt_a4c0d899dc1a
watcher_id NULL
signal_type opportunity_case_memory
value {"case_id":"case_971aa9f87db94f19" ...
threshold NULL
direction NULL
severity low
window NULL
source opportunity_finder
reason_trace {"_evidence_event_ids":["evt_af16659b1 ...
dedupe_key opportunity_case_memory:case_971aa9f87db94f19:moni ...
throttle_s 3600
created_at 2026-04-06T15:02:20.477784+00:00
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