Delete row sig_89c50849a54c from signals

id sig_89c50849a54c
event_id evt_3ed69e9daaa8
watcher_id NULL
signal_type opportunity_digest
value {"count":2,"day":"2026-04-05&# ...
threshold NULL
direction NULL
severity low
window NULL
source opportunity_finder
reason_trace {"_evidence_event_ids":["evt_64cb2acd5 ...
dedupe_key opportunity_digest:2026-04-05
throttle_s 43200
created_at 2026-04-05T00:02:55.463305+00:00
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