Delete row sig_18f68046de9d from signals

id sig_18f68046de9d
event_id evt_78ab9ba61244
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-19T15:24:22.719842+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:6c42c88eacc9aa0b
throttle_s 0
created_at 2026-04-19T15:24:22.719842+00:00
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