Delete row sig_1e66f3a2f6fd from signals

id sig_1e66f3a2f6fd
event_id evt_18eb52d75930
watcher_id NULL
signal_type opportunity_research_snapshot
value {"as_of":"2026-04-20T00:06:57.902486+0 ...
threshold NULL
direction NULL
severity NULL
window NULL
source opportunity_research_ingestor
reason_trace {}
dedupe_key opportunity_research_snapshot:1c7b1279ec675a0f
throttle_s 0
created_at 2026-04-20T00:06:57.902486+00:00
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