Delete row sig_664c337af1cf from signals

id sig_664c337af1cf
event_id evt_1e3addc446d8
watcher_id NULL
signal_type conversation_followup_escalated
value 1.0
threshold NULL
direction NULL
severity NULL
window NULL
source episode_router
reason_trace {"_evidence_event_ids":["evt_2012b2ddb ...
dedupe_key signal:conversation_followup_escalated:thr_3cb8508 ...
throttle_s 0
created_at 2026-04-08T21:04:31.986830+00:00
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